אסיף מאגר המחקר החקלאי

Comparative toxicity of chlorfluazuron (IKI-7899) and cypermethrin to Spodoptera littoralis, Lobesia botrana and Drosophila melanogaster

Year:

1986

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Volume :

5

Co-Authors:

Ishaaya, I., Department of Entomology, ARO, The Volcani Center, Bet Dagan 50-250, Israel
Navon, A., Department of Entomology, ARO, The Volcani Center, Bet Dagan 50-250, Israel
Gurevitz, E., Department of Entomology, ARO, The Volcani Center, Bet Dagan 50-250, Israel

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Abstract:

Chlorfluazuron sprayed on cotton seedlings was more efficient than cypermethrin against third-instar larvae of the Egyptian cotton leafworm, Spodoptera littoralis. At a concentration of 3·2 x 10-5% a.i., chlorfluazuron caused 98 ± 2% larval mortality and cypermethrin 35 ± 9%. All larvae in chlorfluazuron assays died during moulting; hence the leaf area consumed during the test instar was not appreciably affected. On the other hand, in cypermethrin assays, larvae died during the intermoult stage. Chlorfluazuron exhibited potency similar to that of cypermethrin on third-instar larvae of the grape berry moth Lobesia botrana, resulting in 90-95% and 33-34% mortality in treatment concentrations of 5 x 10-3% and 2 x 10-4% a.i., respectively. In another grapevine pest, Drosophila melanogaster, cypermethrin suppressed larval and adult formation to a greater extent than chlorfluazuron. The high potency of chlorfluazuron on various insects, together with its low toxicity to man and the environment, renders this compound a potential agent for controlling important agricultural pests. © 1986.

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