The influence of some insect growth regulators on mortality and fecundity of the aphidophagous coccinellids Adalia bipunctata L. and Coccinella septempunctata L. (Col., Coccinellidae)
1994
Olszak, R.W. (Institute of Pomology and Floriculture, Skierniewice (Poland). Dept. of Plant Protection) | Pawlik, B. | Zajak, R.Z.
Investigations were carried out to evaluate the influence of some insect growth regulators (IRGs) on different developmental stages of Adalia bipunctata and Coccinella septempunctata. The experiment was based on eggs, larvae and adults reared in laboratory conditions. These stages were treated with IRGs in three ways: 1. by immersing the specimens for 5 sec into a solution of the insecticide tested; 2. by placing the adults and larvae of different stages into a small container together with two leaves picked up from a tree treated with the insecticide in question; 3. by feeding adult coccinellids with aphids contaminated by a recommended concentration of IGR solution. The experiments have shown that the tested IGRs affected all developmental stages of both coccinellid species but the results varied according to stage, way of treating and kind of chemical used. Some of the insecticides elicited a drastical reduction of the fecundity, especially in ladybirds fed with contaminated aphids (e.g. with teflubenzuron, fenoxycarb and flufenoxuron). Moreover, chlorfluazuron was the most dangerous one for almost all larval stages. From the other hand IGRs exerted a relatively low influence on adult coccinellids
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