International Journal of Tropical Insect Science

Table of Contents - February 1990 - Volume 11, Issue 01  

Research Articles

Effect of juvenile hormone analogues on the reproduction and longevity of mustard aphid, Lipaphis erysimi (Kalt.)

Gursharan Singha1 and H. S. Sidhua1

a1 Department of Processing and Agricultural Structures, College of Agricultural Engineering, Punjab Agricultural University, Ludhiana-141004 (Pb.), India

Abstract

Effects of topical application of two juvenile hormone analogues (JHAs), R-20458 (6, 7-epoxy-1(p-ethylphenoxy)-3, 7-dimethyl-2-octene) and ZR-512 (ethyl 3, 7, 11-trimetnyl-2, 4-dodecadienoate) on reproduction and longevity of mustard aphid, Lipaphis erysimi (Kalt.) were investigated. Doses of the JHAs as high as 2 μg per aphid failed to reduce the fecundity of the aphid though initial reduction in the daily reproduction was observed. Also, the doses which induced morphogenetic abnormalities at the third-instar, could not affect embryogenesis.

Résumé

Les effets de l'application journalière de deux hormones analogues à JH, R-20458 (6, 7-epoxy-1 (p-ethylphenoxy)-3, 7-dimethyl-2-octene) et ZR-512 (ethyl 3, 7, 11-trimethyl-2, 7-dodecadienate) sur la reproduction et la longevité du Lipaphis erysimi (Kalt) ont étè analyse. Les doses de deux hormones analogues à JH de 2μg par aphide n'ont pas reduit la fecondité des aphides, bien qu' une reduction initiale journalière fut observée. Les doses provoquant des deformations morphogenetiques aux larves du 3eme stage n'ont eu aucun effet sur l'embryogenèse.

(Received February 21 1989)

(Revised August 15 1989)

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