Side effects of conventional and non-conventional insecticides on eggs and larvae of Chrysoperla externa (Hagen) (Neuroptera: Chrysopidae in Argentine

SCHNEIDER, MARCELA; PINEDA, SAMUEL; SMAGGHE, GUY

Communications in Applied Agricultural and Biological Sciences

Lugar: Ghent; Año: 2006 vol. 71 p. 425 - 427

The objective of this work was to evaluate the effect of two conventional insecticides commonly used in soybean crops of Argentina, endosulfan (Endosulfan 35 Glex®, 105 ppm) and cypermethrin (Glextrin® 25, 7S ppm) and two insecticides belonging to the new isecticides´ generation, methoxyfenozide (Inteprid® 24%, 144 ppm) and spinosad (Tacer® 48%, 120 ppm), on eggs and larvae of Chrysoperla externa (Hagen) by dípping and topical application, respectively, under laboratory conditions. After egg treatment, the percentage of egg hatching, duration of the embryonic period and Survival of first instar larvae were evaluated. In the thírd-instar larvae assay, the survivorship of the larvae and pupae, as well as eggs fertility were recorded. Endosulfan and cypermethrin were highly toxic towards eggs and larvae with mortality rates ranging from 80% to 100%. Toxicity of spinosad was intermediate causing short-term effects, but it did not cause any long-term effects. Methoxyfenozide was harmless to eggs and larvae of C. externa, showing a good potential for use in integrated pest management in soybean crops. The selectivity of these insecticides and their inclusion in IPM programs is discussed.