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

The results obtained indicate that the Chrysoperia carnea collected from Giza region (where no insecticidal treatments were used), were more sensitive to malathion than those of Kafr El‐Sheikh, where insecticides were used intensively. In predator colonies which were treated repeatedly with malathion, the sensitivity to malathion decreased from the first to the fifth generation. On the other hand, insects of the reference colony, showed a considerable increase in sensitivity within the same generations.