AphidsCaused by: Myzus persicae
Problem Category: Insect
Symptoms: Small soft bodied Insect on underside of leaves and/or stems of plant; usually green or yellow in color, but may be pink, brown, red or black depending on species and host plant; if aphid infestation is heavy it may cause leaves to yellow and/or be distorted, necrotic spots on leaves and/or stunted shoots; aphids secrete a sticky, sugary substance called honeydew which encourages the growth of sooty mold on the plants.
Comments: Distinguishing features of aphids include the presence of cornicles (tubular structures) which project backwards from the insect's body; aphids will generally not move very quickly when disturbed; aphids may also transmit plant viruses to the plant when they feed.
Management: If aphid population is limited to just a few leaves or shoots then the infestation can be pruned out to provide control; check transplants for aphids before planting; use tolerant varieties if available; reflective mulches such as silver colored plastic can deter aphids from feeding on plants; sturdy plants can be sprayed with a strong jet of water to knock aphids from leaves; insecticidal soaps or oils such as neem or canola oil are usually the best method of control; always check the labels of the products for specific usage guidelines prior to use.
Control: Mix 5% Neem seed kernal extract in 100 litre of water and spray at the bottom of the leaf