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Diagnose Sick Cannabis Plants | Marijuana Nutrient Problems & Symptoms by Picture
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<blockquote data-quote="L0oD" data-source="post: 420470" data-attributes="member: 42867"><p>Fungus Gnats</p><p></p><p></p><p></p><p>Cannabis Fungus Gnat Cheat Sheet</p><p></p><p>Fungus gnats start buzzing around cannabis plants when the topsoil stays wet for too long.</p><p></p><p>Introduction</p><p></p><p>Fungus gnats - how do you get rid of these tiny flying pests that lay eggs in your soil?This article will teach cannabis growers (like you) exactly that: how to completely eradicate fungus gnats</p><p>and ensure they never come back!</p><p>Fungus gnats are a common problem for soil cannabis growers (especially those who overwater their plants!),but they're actually easy to get rid of once you know what to do!Fungus gnats (also known as “sciarid flies”) are black or dark brown flies which look like tiny mosquitoes with dark wings.</p><p></p><p>How Big Is a Fungus Gnat?</p><p></p><p>Fungus gnats are small, only about 2 mm long. To give you an idea of how big that is, 2mm is about the thickness of a quarter.[ATTACH=full]55911[/ATTACH]</p><p></p><p>Despite their small size, fungus gnats can be a big nuisance in your soil cannabis grow, mostly because their tiny maggot/larvae offspring will hurt your plants roots (which will cause problems for your plants).</p><p></p><p>What Causes Fungus Gnats to Attack Cannabis Plants?</p><p></p><p>Fungus gnat larvae eat fungus or decaying matter, and need wet conditions to thrive. It is common for soil growers to overwater their cannabis plants, and wet soil is the perfect home for fungus and decaying organic matter. After fungus has grown (often invisible to the naked eye) or overwatered matter has begun to decay in the topsoil, fungus gnat lays their eggs in in the top layer of wet soil.</p><p></p><p>Warm + wet topsoil = fungus gnats (and other problems or pests in soil)</p><p></p><p>These eggs hatch into larvae that look like tiny maggots which only live in the top 2-3 inches(5-8 cm) of soil. The fungus gnat larvae are the culprits which cause damage to cannabis roots.</p><p></p><p>Cannabis roots are not the main source of food for fungus gnat larvae, but roots get caught in the crossfire. Although the main diet of fungus gnats is fungus and decaying matter, the larvae happily</p><p>gnaw on root hairs and young tender roots of cannabis plants.The damage to the roots from these little suckers cause problems in the leaves and slowed growth. A bad fungus gnat infestation can even kill</p><p>cannabis plants, especially young seedlings.</p><p></p><p>While the main problem is that fungus gnat larvae attack the roots of your cannabis plants, the adult fungus gnats can also spread diseases (such as pythium - a common cause of root rot) via their feet.</p><p></p><p>Because of these problems, it is important to get rid of a fungus gnat infestation right away.</p><p></p><p>If fungus gnats need fungus and decaying matter to survive, where is the fungus coming from?</p><p>Fungus grows in wet conditions and is an essential part of the environment (where it breaks down organic matter like dead leaves). Fungus spores are around us everywehere pretty much all the time, but these spores will never start growing without moisture. Warm and wet conditions in the soil of a cannabis grow are what cause fungus to grow and matter to decay. Sometimes you won't even be able to see the fungus or decaying matter with the naked eye. But once the conditions are right, fungus gnats thrive in the top layer of you soil whether you can see fungus or not.[ATTACH=full]55913[/ATTACH]</p><p>Check To Make Sure You Have Fungus Gnats</p><p></p><p>1.) Tiny flying black bugs around your plants & crawling on your soil.</p><p></p><p>Even if your plant or leaves aren't showing symptoms or distress yet, if you see fungus gnats it means that you have a problem with fungus and moisture in your soil. Don't let the infestation get out of hand.</p><p>It’s always recommended to get rid of any pests in the grow room as soon as you know they’re there!</p><p></p><p>The adult fungus gnat flies are just annoying (and gross); they don't bite you, and don't do much to hurt your plants directly besides spreading disease. But even though the mature fungus gnats aren't a huge threat to your plants, the presence of adult gnats lets you know that your cannabis soil has been infested with their maggot offspring which causes the real problems.</p><p></p><p>2.) Tiny white or translucent larvae with black heads in the soil</p><p></p><p>Note: this picture is really big so you can see what you're looking for, but the actual larvae / maggots are TINY. If you spot them, you'll just see tiny white spots wriggling around in the topsoil.</p><p>[ATTACH=full]55914[/ATTACH] </p><p>It’s the fungus gnat larvae in the soil that damage your plant roots and cause growing problems,especially to seedlings or young plants.</p><p></p><p>How Fungus Gnat Larvae Cause Damage to Cannabis Plants</p><p></p><p>Larvae attack tender new plant roots and root hairs, which cause these problems:</p><p>“Damping off” - seeds or seedlings are weak for no apparent reason; sometimes stems weaken and seedlings can even just fall over and die.If the fungus gnat infestation gets out of hand, even adult cannabis plants</p><p>start looking unhealthy, showing many symptoms such as wilting, yellowing, drooping, spots. Cannabis leaves may show signs of nutrient deficiency (or deficiencies) which seem to be unrelated to pH,</p><p>nutrients, or any other identifiable nutrient problem.</p><p>Plants will start growing slowly and may even stop growing altogether.</p><p>If the infestation hits in the flowering stage, yields can be reduced.</p><p></p><p>Fungus Gnats vs Fruit Flies</p><p></p><p>Quick Check! Make sure you have fungus gnats and not fruit flies.</p><p></p><p>Fruit flies are brown/yellow/orange while fungus gnats are dark brown or black. Fruit flies tend to be bigger/fatter and easier to see than tiny fungus gnats. You need to take a slightly different approach</p><p>with fruit flies.[ATTACH=full]55915[/ATTACH]</p><p>Fruit flies will keep coming back if there’s ripe or rotting fruit to eat. If you've ever left a banana or other fruit on your counter too long, you've probably noticed how fruit flies seem to be able to appear out of thin air if there’s ripe fruit around.</p><p></p><p>Fruit flies can start buzzing around poorly composted soil which contains kitchen scraps, but otherwise fruit flies are uncommon in the grow room unless there’s ripe/rotting fruit or other tasty bits for them</p><p>to eat.</p><p></p><p>So once you get rid of their food, the fruit flies will disappear.</p><p></p><p>Pics of Damage to Cannabis Plants From Fungus Gnats</p><p></p><p>A fungus gnat infestation on your cannabis plants can cause all sorts of strange problems - often they look like overwatering, pH problems or nutrient deficiencies. The more fungus gnats you have, the more</p><p>likely you'll see damaged leaves and reduced growth rates.</p><p></p><p>Since fungus gnats are almost always caused by overwatering and too-wet topsoil conditions, some of these symptoms may actually be caused by too-wet soil. In any case, when you see fungus gnats, it means there's a problem in your setup that needs to be addressed.</p><p>[ATTACH]55916[/ATTACH] [ATTACH]55917[/ATTACH] </p><p>[ATTACH=full]55918[/ATTACH] </p><p> [ATTACH]55919[/ATTACH] [ATTACH]55920[/ATTACH] </p><p></p><p>Here's a flowering cannabis plant affected by fungus gnats![ATTACH=full]55921[/ATTACH] </p><p>What To Do If You Have Fungus Gnats in Your Soil</p><p></p><p>Most importantly, don’t overwater your plants! Never water cannabis plants grown in soil until the top inch of soil feels dry (up to your first knuckle). Fungus gnats need wet topsoil conditions to grow and</p><p>thrive. The most common reason growers get fungus gnats is overwatering their plants.</p><p></p><p>Get Rid Of Fungus Gnats Quickly: What You Need</p><p></p><p>Yellow Sticky Cards</p><p>A larvae-killing product with bacillus thuringiensis bacteria</p><p>A fan to blow air over the top of your soil</p><p>(Optional, but recommended) Diatomaceous earth - food grade</p><p></p><p>1.) Place yellow sticky cards in the grow area - fungus gnats love the color yellow and will fly towards it.</p><p>These yellow sticky cards (found at most gardening stores) are covered with a glue that will trap adult fungus gnats, bringing down their numbers.</p><p></p><p>But the most important reason to use yellow sticky cards is to help you keep track of how bad the current fungus gnat infestation is. As the infestation is reduced, there will be less adults caught in the yellow</p><p>sticky traps. That's how you know that your approach is working.</p><p> [ATTACH]55922[/ATTACH] [ATTACH]55923[/ATTACH] </p><p></p><p>2.) Get a fan blowing air over the top of the growing medium. This helps dry out the top layer of your soil, and also helps prevent the fungus gnats from being able to fly around and lay more eggs.[ATTACH=full]55924[/ATTACH]</p><p>2b.) (Optional, but recommended) Sprinkle food-grade diatomaceous earth over exposed parts of soil.</p><p>This will help kill the fungus gnat larvae and will also help prevent infestations in the future.</p><p>While not completely necessary, adding diatomaceous earthis a great step to take to help get rid of the fungus gnats and their larvae as fast as possible.</p><p></p><p>Diatomaceous earth is an organic insect killer made of fossilized shells. It is sharp on the microscopic level and works by puncturing the exoskeleton of insects (draining them of their body fluids),</p><p>but poses no harm to humans or pets and can even be eaten.[ATTACH=full]55925[/ATTACH]</p><p></p><p>3.) Don’t water your plants for a few days. You want to begin drying out the soil to kill as many larvae as you can before you apply a treatment (which will involve watering). Fungus gnat larvae need a warm,wet environment near the surface of your soil to grow. Even after you’ve gone through all these steps and believe fungus gnats are gone, make sure to avoid overwatering plants, as this is the most common reason growers get fungus gnats in the first place. Don't do the next step until the top few inches of soil has dried out.</p><p></p><p>Learn about other natural ways to kill Fungus Gnat larvae</p><p></p><p>5.) Avoid overwatering your cannabis plants from now on. Never water your cannabis plants in soil until the top inch or two of soil has dried out. From now on, you don't want to ever let the top part of soil</p><p>stay wet to create a breeding ground for fungus and fungus gnats.</p><p></p><p>6.) Keep your sticky yellow cards up until Fungus Gnats are completely gone. These yellow sticky cards will continue killing adult gnats. They're also helpful because they will alert you to whether fungus gnat</p><p>numbers are rising or falling. Even after killing all the larvae, it may take a few days to a few weeks before the adult fungus gnats are completely gone and you stop seeing new gnats caught on your sticky cards.[ATTACH=full]55926[/ATTACH]</p><p></p><p>What is bacillus thuringiensis?</p><p></p><p>This type of bacteria produces a toxin that hurts the larvae of fungus gnats and prevents them from being able to eat. Bacillus thuringiensis will not affect your plants or roots in any other way. Products that</p><p>contain this bacteria are sometimes listed as “BT” or “BTi.” It is also safe for fish, pets, humans and pretty much everything besides larvae. It is safe for organic grows, even in the middle of the flowering/budding stage, and won’t hurt other microbes living in the soil.</p><p></p><p>When using pellet-type formulations of bacillus thuringiensis, you will get better results if you crush it up before sprinkling on soil. Powder and dry formulations of bacillus thuringiensis seem to work better</p><p>than liquid ones.</p><p></p><p>Other Ways to Kill Fungus Gnat Larvae</p><p></p><p>While bacillus thuringiensis is probably the best way to naturally kill fungus gnat larvae, you can use other biological control methods to kill these maggots. The following options will help control fungus gnat</p><p>infestations but will likely not completely get rid of them unless you stop overwatering your plants.</p><p></p><p>Growing Organic? The “brute force” methods above (SM-90 or Hydrogen Peroxide) will kill the fungus gnat</p><p>larvae, but will also kill many beneficial microbes in the soil. You can add beneficial microbes back, but it will take a while for them to repopulate your soil. This problem only really affects organic soil</p><p>growers. If you’re providing nutrients to your plants with bottled nutrients, you’re already providing nutrients in a way that your plants will be able to use even if the microbe populations are down. In any</p><p>case, if growing organically, an organic version of bacillus thuringiensis (subspecies israelensis) is the best option for getting rid of fungus gnats.</p><p>[ATTACH=full]55927[/ATTACH] </p><p></p><p>Prepare For Your Next Grow: Prevention</p><p></p><p>Before your next grow, make sure you thoroughly clean your growing area if you’ve been attacked by fungus gnats or other pests. Get rid of any houseplants that have any bugs flying around them. Never buy soil</p><p>that has already been infested with fungus gnats or show any signs of flying bugs or larvae/maggots.</p><p></p><p>Some growers will even cook new soil to make sure any fungus gnat larvae are dead before letting their cannabis plants or clones near it.</p><p></p><p>If you’re getting cannabis clones, make sure you get them from a trusted source and inspect closely for fungus gnats (as well as spider mites or other pests). You may want to start with seeds if you’re growing in soil and worried about bugs, as clones are the most common way to introduce pests to the grow room.</p><p></p><p>Speaking of cannabis clones... I know this article is about fungus gnats, but I want to mention something else that’s very important about cannabis clones. While fungus gnats are a big nuisance, they are not the</p><p>worst pests a grower can get from cannabis clones. Fungus gnat problems pale in comparison to the horrible affliction of getting cannabis-specific spidermites (aka “the borg”).</p><p></p><p>Once a grow room gets infected by the borg, it is incredibly difficult to get rid of these resilient pests which kill your plants, eat your leaves, and cover your plants (and buds) with horrible webbing.</p><p>Always check new cannabis clones thoroughly (including under leaves for bugs or eggs) before letting new clones anywhere near your grow area! You may want to dip new clones in spider mite killer to make sure</p><p>they are free of spider mites. Learn more about spider mites.</p><p></p><p>Some growers will start with cannabis seeds (as opposed to clones) to reduce the chance they ever have to deal with spider mites or fungus gnats!</p><p></p><p>Other Ways to Kill Fungus Gnat Larvae</p><p></p><p>While bacillus thuringiensis is probably the best way to naturally kill fungus gnat larvae, you can use other biological control methods to kill these maggots. The following options will help control fungus</p><p>gnat infestations but will likely not completely get rid of them unless you stop overwatering your plants.</p><p></p><p></p><p>Leaf Color:</p><p>Edges Appear Brown or Burnt</p><p>Pale Color Leaves</p><p>Yellow Leaves - New Growth</p><p>Yellowing Between Veins</p><p>Black or Gray Patches on Leaves</p><p>Brown or Dark Spots</p><p>Leaf Symptoms:</p><p>Upper Leaves / Newer Growth Affected</p><p>Small Inner Leaves Affected</p><p>All Leaves Seem Affected</p><p>Leaf Edges Appear Burnt</p><p>Yellowing Between Veins</p><p>Spots</p><p>Slow Growth</p><p>Twisted Growth</p><p>Abnormal Growth</p><p>Leaves Curl Under</p><p>Wilting / Drooping</p><p>Plant Symptoms:</p><p>Slow Growth</p><p>Twisted Growth</p><p>Leaves Curl Under</p><p>Plant Wilting / Drooping</p><p>Root Symptoms:</p><p>Slow Growing</p><p>Other Symptoms:</p><p>Bugs</p><p>Buds Not Fattening</p></blockquote><p></p>
[QUOTE="L0oD, post: 420470, member: 42867"] Fungus Gnats Cannabis Fungus Gnat Cheat Sheet Fungus gnats start buzzing around cannabis plants when the topsoil stays wet for too long. Introduction Fungus gnats - how do you get rid of these tiny flying pests that lay eggs in your soil?This article will teach cannabis growers (like you) exactly that: how to completely eradicate fungus gnats and ensure they never come back! Fungus gnats are a common problem for soil cannabis growers (especially those who overwater their plants!),but they're actually easy to get rid of once you know what to do!Fungus gnats (also known as “sciarid flies”) are black or dark brown flies which look like tiny mosquitoes with dark wings. How Big Is a Fungus Gnat? Fungus gnats are small, only about 2 mm long. To give you an idea of how big that is, 2mm is about the thickness of a quarter.[ATTACH=full]55911[/ATTACH] Despite their small size, fungus gnats can be a big nuisance in your soil cannabis grow, mostly because their tiny maggot/larvae offspring will hurt your plants roots (which will cause problems for your plants). What Causes Fungus Gnats to Attack Cannabis Plants? Fungus gnat larvae eat fungus or decaying matter, and need wet conditions to thrive. It is common for soil growers to overwater their cannabis plants, and wet soil is the perfect home for fungus and decaying organic matter. After fungus has grown (often invisible to the naked eye) or overwatered matter has begun to decay in the topsoil, fungus gnat lays their eggs in in the top layer of wet soil. Warm + wet topsoil = fungus gnats (and other problems or pests in soil) These eggs hatch into larvae that look like tiny maggots which only live in the top 2-3 inches(5-8 cm) of soil. The fungus gnat larvae are the culprits which cause damage to cannabis roots. Cannabis roots are not the main source of food for fungus gnat larvae, but roots get caught in the crossfire. Although the main diet of fungus gnats is fungus and decaying matter, the larvae happily gnaw on root hairs and young tender roots of cannabis plants.The damage to the roots from these little suckers cause problems in the leaves and slowed growth. A bad fungus gnat infestation can even kill cannabis plants, especially young seedlings. While the main problem is that fungus gnat larvae attack the roots of your cannabis plants, the adult fungus gnats can also spread diseases (such as pythium - a common cause of root rot) via their feet. Because of these problems, it is important to get rid of a fungus gnat infestation right away. If fungus gnats need fungus and decaying matter to survive, where is the fungus coming from? Fungus grows in wet conditions and is an essential part of the environment (where it breaks down organic matter like dead leaves). Fungus spores are around us everywehere pretty much all the time, but these spores will never start growing without moisture. Warm and wet conditions in the soil of a cannabis grow are what cause fungus to grow and matter to decay. Sometimes you won't even be able to see the fungus or decaying matter with the naked eye. But once the conditions are right, fungus gnats thrive in the top layer of you soil whether you can see fungus or not.[ATTACH=full]55913[/ATTACH] Check To Make Sure You Have Fungus Gnats 1.) Tiny flying black bugs around your plants & crawling on your soil. Even if your plant or leaves aren't showing symptoms or distress yet, if you see fungus gnats it means that you have a problem with fungus and moisture in your soil. Don't let the infestation get out of hand. It’s always recommended to get rid of any pests in the grow room as soon as you know they’re there! The adult fungus gnat flies are just annoying (and gross); they don't bite you, and don't do much to hurt your plants directly besides spreading disease. But even though the mature fungus gnats aren't a huge threat to your plants, the presence of adult gnats lets you know that your cannabis soil has been infested with their maggot offspring which causes the real problems. 2.) Tiny white or translucent larvae with black heads in the soil Note: this picture is really big so you can see what you're looking for, but the actual larvae / maggots are TINY. If you spot them, you'll just see tiny white spots wriggling around in the topsoil. [ATTACH=full]55914[/ATTACH] It’s the fungus gnat larvae in the soil that damage your plant roots and cause growing problems,especially to seedlings or young plants. How Fungus Gnat Larvae Cause Damage to Cannabis Plants Larvae attack tender new plant roots and root hairs, which cause these problems: “Damping off” - seeds or seedlings are weak for no apparent reason; sometimes stems weaken and seedlings can even just fall over and die.If the fungus gnat infestation gets out of hand, even adult cannabis plants start looking unhealthy, showing many symptoms such as wilting, yellowing, drooping, spots. Cannabis leaves may show signs of nutrient deficiency (or deficiencies) which seem to be unrelated to pH, nutrients, or any other identifiable nutrient problem. Plants will start growing slowly and may even stop growing altogether. If the infestation hits in the flowering stage, yields can be reduced. Fungus Gnats vs Fruit Flies Quick Check! Make sure you have fungus gnats and not fruit flies. Fruit flies are brown/yellow/orange while fungus gnats are dark brown or black. Fruit flies tend to be bigger/fatter and easier to see than tiny fungus gnats. You need to take a slightly different approach with fruit flies.[ATTACH=full]55915[/ATTACH] Fruit flies will keep coming back if there’s ripe or rotting fruit to eat. If you've ever left a banana or other fruit on your counter too long, you've probably noticed how fruit flies seem to be able to appear out of thin air if there’s ripe fruit around. Fruit flies can start buzzing around poorly composted soil which contains kitchen scraps, but otherwise fruit flies are uncommon in the grow room unless there’s ripe/rotting fruit or other tasty bits for them to eat. So once you get rid of their food, the fruit flies will disappear. Pics of Damage to Cannabis Plants From Fungus Gnats A fungus gnat infestation on your cannabis plants can cause all sorts of strange problems - often they look like overwatering, pH problems or nutrient deficiencies. The more fungus gnats you have, the more likely you'll see damaged leaves and reduced growth rates. Since fungus gnats are almost always caused by overwatering and too-wet topsoil conditions, some of these symptoms may actually be caused by too-wet soil. In any case, when you see fungus gnats, it means there's a problem in your setup that needs to be addressed. [ATTACH]55916[/ATTACH] [ATTACH]55917[/ATTACH] [ATTACH=full]55918[/ATTACH] [ATTACH]55919[/ATTACH] [ATTACH]55920[/ATTACH] Here's a flowering cannabis plant affected by fungus gnats![ATTACH=full]55921[/ATTACH] What To Do If You Have Fungus Gnats in Your Soil Most importantly, don’t overwater your plants! Never water cannabis plants grown in soil until the top inch of soil feels dry (up to your first knuckle). Fungus gnats need wet topsoil conditions to grow and thrive. The most common reason growers get fungus gnats is overwatering their plants. Get Rid Of Fungus Gnats Quickly: What You Need Yellow Sticky Cards A larvae-killing product with bacillus thuringiensis bacteria A fan to blow air over the top of your soil (Optional, but recommended) Diatomaceous earth - food grade 1.) Place yellow sticky cards in the grow area - fungus gnats love the color yellow and will fly towards it. These yellow sticky cards (found at most gardening stores) are covered with a glue that will trap adult fungus gnats, bringing down their numbers. But the most important reason to use yellow sticky cards is to help you keep track of how bad the current fungus gnat infestation is. As the infestation is reduced, there will be less adults caught in the yellow sticky traps. That's how you know that your approach is working. [ATTACH]55922[/ATTACH] [ATTACH]55923[/ATTACH] 2.) Get a fan blowing air over the top of the growing medium. This helps dry out the top layer of your soil, and also helps prevent the fungus gnats from being able to fly around and lay more eggs.[ATTACH=full]55924[/ATTACH] 2b.) (Optional, but recommended) Sprinkle food-grade diatomaceous earth over exposed parts of soil. This will help kill the fungus gnat larvae and will also help prevent infestations in the future. While not completely necessary, adding diatomaceous earthis a great step to take to help get rid of the fungus gnats and their larvae as fast as possible. Diatomaceous earth is an organic insect killer made of fossilized shells. It is sharp on the microscopic level and works by puncturing the exoskeleton of insects (draining them of their body fluids), but poses no harm to humans or pets and can even be eaten.[ATTACH=full]55925[/ATTACH] 3.) Don’t water your plants for a few days. You want to begin drying out the soil to kill as many larvae as you can before you apply a treatment (which will involve watering). Fungus gnat larvae need a warm,wet environment near the surface of your soil to grow. Even after you’ve gone through all these steps and believe fungus gnats are gone, make sure to avoid overwatering plants, as this is the most common reason growers get fungus gnats in the first place. Don't do the next step until the top few inches of soil has dried out. Learn about other natural ways to kill Fungus Gnat larvae 5.) Avoid overwatering your cannabis plants from now on. Never water your cannabis plants in soil until the top inch or two of soil has dried out. From now on, you don't want to ever let the top part of soil stay wet to create a breeding ground for fungus and fungus gnats. 6.) Keep your sticky yellow cards up until Fungus Gnats are completely gone. These yellow sticky cards will continue killing adult gnats. They're also helpful because they will alert you to whether fungus gnat numbers are rising or falling. Even after killing all the larvae, it may take a few days to a few weeks before the adult fungus gnats are completely gone and you stop seeing new gnats caught on your sticky cards.[ATTACH=full]55926[/ATTACH] What is bacillus thuringiensis? This type of bacteria produces a toxin that hurts the larvae of fungus gnats and prevents them from being able to eat. Bacillus thuringiensis will not affect your plants or roots in any other way. Products that contain this bacteria are sometimes listed as “BT” or “BTi.” It is also safe for fish, pets, humans and pretty much everything besides larvae. It is safe for organic grows, even in the middle of the flowering/budding stage, and won’t hurt other microbes living in the soil. When using pellet-type formulations of bacillus thuringiensis, you will get better results if you crush it up before sprinkling on soil. Powder and dry formulations of bacillus thuringiensis seem to work better than liquid ones. Other Ways to Kill Fungus Gnat Larvae While bacillus thuringiensis is probably the best way to naturally kill fungus gnat larvae, you can use other biological control methods to kill these maggots. The following options will help control fungus gnat infestations but will likely not completely get rid of them unless you stop overwatering your plants. Growing Organic? The “brute force” methods above (SM-90 or Hydrogen Peroxide) will kill the fungus gnat larvae, but will also kill many beneficial microbes in the soil. You can add beneficial microbes back, but it will take a while for them to repopulate your soil. This problem only really affects organic soil growers. If you’re providing nutrients to your plants with bottled nutrients, you’re already providing nutrients in a way that your plants will be able to use even if the microbe populations are down. In any case, if growing organically, an organic version of bacillus thuringiensis (subspecies israelensis) is the best option for getting rid of fungus gnats. [ATTACH=full]55927[/ATTACH] Prepare For Your Next Grow: Prevention Before your next grow, make sure you thoroughly clean your growing area if you’ve been attacked by fungus gnats or other pests. Get rid of any houseplants that have any bugs flying around them. Never buy soil that has already been infested with fungus gnats or show any signs of flying bugs or larvae/maggots. Some growers will even cook new soil to make sure any fungus gnat larvae are dead before letting their cannabis plants or clones near it. If you’re getting cannabis clones, make sure you get them from a trusted source and inspect closely for fungus gnats (as well as spider mites or other pests). You may want to start with seeds if you’re growing in soil and worried about bugs, as clones are the most common way to introduce pests to the grow room. Speaking of cannabis clones... I know this article is about fungus gnats, but I want to mention something else that’s very important about cannabis clones. While fungus gnats are a big nuisance, they are not the worst pests a grower can get from cannabis clones. Fungus gnat problems pale in comparison to the horrible affliction of getting cannabis-specific spidermites (aka “the borg”). Once a grow room gets infected by the borg, it is incredibly difficult to get rid of these resilient pests which kill your plants, eat your leaves, and cover your plants (and buds) with horrible webbing. Always check new cannabis clones thoroughly (including under leaves for bugs or eggs) before letting new clones anywhere near your grow area! You may want to dip new clones in spider mite killer to make sure they are free of spider mites. Learn more about spider mites. Some growers will start with cannabis seeds (as opposed to clones) to reduce the chance they ever have to deal with spider mites or fungus gnats! Other Ways to Kill Fungus Gnat Larvae While bacillus thuringiensis is probably the best way to naturally kill fungus gnat larvae, you can use other biological control methods to kill these maggots. The following options will help control fungus gnat infestations but will likely not completely get rid of them unless you stop overwatering your plants. Leaf Color: Edges Appear Brown or Burnt Pale Color Leaves Yellow Leaves - New Growth Yellowing Between Veins Black or Gray Patches on Leaves Brown or Dark Spots Leaf Symptoms: Upper Leaves / Newer Growth Affected Small Inner Leaves Affected All Leaves Seem Affected Leaf Edges Appear Burnt Yellowing Between Veins Spots Slow Growth Twisted Growth Abnormal Growth Leaves Curl Under Wilting / Drooping Plant Symptoms: Slow Growth Twisted Growth Leaves Curl Under Plant Wilting / Drooping Root Symptoms: Slow Growing Other Symptoms: Bugs Buds Not Fattening [/QUOTE]
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Diagnose Sick Cannabis Plants | Marijuana Nutrient Problems & Symptoms by Picture
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