Non-systemic, contact insecticides must be applied to all infested plant surfaces for best results, because they must come into direct contact with the insects. In agriculture and nursery crop production, chemical control of certain aphid species is difficult because the aphids have become resistant to certain insecticides. Using some insecticides can even cause aphid populations to dramatically increase after the application is made, possibly because they destroy the aphid's natural enemies or because the aphids are resistant. Carefully monitor the results from any insecticides applied and stay informed as to which compounds perform well. Methods of Controlling Aphids on Ornamental Plants.
Pathogens See Microbial Insecticides below.
These materials affect developing insects only and do not kill adults. These materials inhibit cholinesterase and prevent the transmission of nerve impulses. These products inhibit cholinesterase and prevent the transmission of nerve impulses. These compounds block nerve impulses by binding with the receptors of nerve transmitting chemicals. The information given herein is for educational purposes only.