Weather is very critical. It is critical to control insects to produce high quality broccoli. Accurate timing of insecticides applications and use of the recommended chemical for a specific pest will insure proper control. Some are winged while others are wingless. These sucking insects cause the leaves to curl and become discolored.
Plant lice reproduce rapidly and have a short life cycle.
Under favorable weather conditions, an aphid's life can be as short as 10 days. Use insecticides immediately after finding an aphid infestation. It is very important to be sure that an aphicide is being used. Many of the common insecticides used to control caterpillars will not control aphids. Caterpillars are usually more injurious to the young plant, although they will feed on broccoli until harvest.