Evaluation of tolerance in Chrysoperla carnea Steph. (Neuropt., Chrysopidae) to successive insecticidal treatments

The results obtained indicate that the Chrysoperia cm nea collected from Gi za region (where no insecticidal treatments were used), were more sensitive to malathion than those of KaEr El-Sheikh, where insecticides were used in tensively. In predator colonies which were treated repeatedly with malathio n, the sensitivity to malathion decreased from the first to the fifth gener ation. On the other hand, insects of the reference colony, showed a conside rable increase in sensitivity within the same generations.