THE EFFECT OF SOME NATURAL COMPOUNDS ON THE BLACK CUTWORM

Abstract

The present work a1ms at evaluating the effect of soLe natural I compounds; essential oils of medicinal plant extracts, natural med cinal plant oils and some terpenes on the black cutworm A. ipsilon which is considered as a serious pest of many winter crops, vegetables and cotton plantin Egypt. I First, the present study investigates the acceptability of some plans and their antifeedant properties. Then, different extracts of unaccepted medicinal plants were tested for their insecticidal effects, antifeedant properties and biological activity against the different stages of the black cutworm A. ipsilon. I Moreover, the insecticidal effects of some natural medicinal plants on A.

ipsilon larvae and the biological activity of some terpenes on thb different I stages of A. ipsilon were investigated. The obtained results are summarized

as follows: I

1- The highly acceptable plant species were Ricinus commlnis and

Gossypium barbadense, the moderate acceptable plant species Jere Vicia I faba and Lactuca sativa and the less acceptable plant was Brassica

oleracea, while the unacceptable plant species were Tephrosih nubica, I Dodonaea viscosa, #fatricaria chamomilla, Anethum graved(ens and

Mentha viridis. '

2- The petroleum ether extract of Tephrosia nubica plant was found o be the

most effective as to its ovicidal effect on the 1-day old eggs of A\ ipsilon, I the percentage of unhatched eggs being 85.3 + 1.05% 'at 10%

concentration. The same concentration of chloroform was effedtive at 3 days old eggs, the percentage of unhatched eggs being 50+ l.o2%