Toxicity of some pesticides against the egg stage and the first larval instar of the chrysopid predatorChrysoperia carnea (Steph.)

The toxicity of cypermethrin, deltamethrin, fenpropathrin, fenvalerate, methomyl and kelthane-s against the egg stage and the 1st larval instar ofChrysoperla carnea (Steph.) revealed that deltamethrin exhibited magnitude bad side effects against the eggs (LC₉₀=3.35 ppm) as compared with the safest compound kelthane-s (LC₉₀=144 ppm); the figures of the other tested toxicants ranged between 17.6 and 109.2 ppm.It was found that the larval stage needed higher concentrations to achieve similar mortality percentages. LC₉₀ values ranged between 72.2 and 1,176 ppm. Ranking of toxicity was, however, similar to that of ovicidal action.With one table