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Aphids are small, soft-bodied insects that may be green, yellow, brown, red, or black in colour, depending on species and food source. They reproduce asexually, have "piercing-sucking" mouths, and may or may not have wings. Aphids feed off the plant's cells or phloem. You'll be able to tell an aphid by it leaving behind its "honeydew" excrement or the plant's stunted gross and loss of strength. As they go through their life cycle, aphids will also leave behind their exoskeleton, with little white molts appearing on the top of fan leaves. They rapidly reproduce asexually and hide on stems or under leaves, so it is important to stay vigilant if you see one. One clue to look for when you think you have aphids is the appearance of ants. Ants and Aphids have a symbiotic relationship. The aphid sucks the sap out of the plant while the ant eats the "honeydew" excrement left behind by the aphid. Ants provide protection to the aphids as their food source.

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Firstly, Treatment for aphids is similar to treating mites. Pinch or prune off heavily infested leaves or other plant parts. Look closely, as aphids will usually be found under the leaf or on the stems.

Do your best to stabilize your grows temperature to 20-25C (68-77F) and increase airflow.
Lay or hang sticky traps (yellow or blue)

Before using any harsh chemicals, try a homemade 1:3 vinegar-water mixture and either spray or wipe your plants. A similar spray can be made with dish soap instead.

Applying Diatomaceous Earth (DE) is another organic option. Powdery rock sharp enough to kill small pests. Use a brush to brush the DE over the stems and the leaves. You can even just sprinkle some right onto the big leaves. Even apply some over the top of the soil if necessary.

Predators like Green Lacewings, Orius Inisidousis, and Ladybugs are great for controlling the population. For best results, make releases when pest levels are low to medium. Attacking them early in their life cycle will deliver the highest success. The predator bugs are harmless to your plant and are another organic way of pest control.

For outdoor growers, Bug Blaster to hose off plants and any bugs that are hiding in the foliage could work.

Chemical-based foliar sprays like Doktor Doom, Safers, Spinosad or Neem oil could also be used when other options are not working, and the problem needs to be resolved before it gets out of hand.

If aphids are a recurring problem for your grow, consider growing companion plants like Cilantro, marigolds, basil and peppermint. A crucial point of prevention is never to bring outdoor plants inside. Even if you are cutting clones, you must be very careful and diligent in ensuring you aren't bringing anything in with it.