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; insecticides are generally only required to treat aphids if the infestation is very high - plants generally tolerate low and medium level infestation; 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: yellowsticky traps 5-6 in the field,spray vitex decoction to control the aphids