Very tiny wasps lay eggs in the aphid bodies. A close inspection of parasitized aphids might even reveal a tiny exit hole where the new adult wasp emerged to continue the cycle of destroying more aphids. Obviously, there is no need to spray there if you find insect predators or parasites working over an aphid infestation. Cabbage worms and loopers will be on all cole crops including broccoli, cabbage, collards, kale and cauliflower. Use Bt late in the day and thoroughly cover the leaves with the spray.
Information given above is for educational purposes only.
Reference to commercial products or trade names is made with the understanding that no discrimination is intended and no endorsement by the Texas Agricultural Extension Service is implied. Keith Hansen is Smith County Horticulturist with the Texas Agricultural Extension Service. Educational programs of the Texas Agricultural Extension Service are open to all individuals without regard to race, color, sex, disability, religion, age or national origin.