Aphids are small insects ranging in size from 1 mm to a few mm, aphids suck the sap from plants and they like all types of cannabis plants, they tend to favor soft parts of the plant such as young stems and leaves. Aphids can range in color from green to yellow, brown to orange and black. In small numbers aphids are nothing to worry about as they can be killed by hand by squishing them, but if you have large numbers it is worth treating them with an aphid spray. Aphids mostly affect outdoor plants but they can also infest indoor grows where pest infestations happen as a result of aphids having no predators who will eat or kill them. They are relatively easy to spot and if you shake your plant you will notice them falling off. Most aphids are wingless but you can often notice winged individuals in a colony. Aphids cause leaf curling, leaf discoloration and stunt growth in cannabis plants in particularly the shoots. Aphids can also transmit plant diseases such as the mosacic tobbaco virus,this is another reason to eliminate aphid populations.
Aphids can be controlled using lady beattles or lacewings. You can buy lady beattle larve and release them into your gardens or onto plants in your grow space. Gently knocking or shaking your plant or spraying it with a strong water spray will dislodge aphids, once on the ground they can easily be killed and any surviving ones will find it difficult to make it back to your plants. In warmer climates aphids can live in gardens and on plants year round, in cooler climates they are more common only in warmer months. In indoor grows you can find them at any time as indoor grow temps are what aphids love.
For effective treatments of large or hard to control aphid populations you can use Neem oil, insecticide soap ( pyrethrin based ) or pyrethrin sprays, these can be used in combination or by themselves to treat aphid infestations.