Influence of maize row spacing on infestation and damage of intercropped beans by the bean aphid (Aphis fabae Scop.). II. Reduction in bean yields

Publication Type

Journal Article

Journal Name

Journal of Economic Entomology

Publication Date

1-1-2001

Abstract

Both in a choice and multi-choice laboratory tests, fewer adults of the banana root borer, Cosmopolites sordidus (Germar), settled under the corms of the susceptible banana "Nakyetengu" treated with 5% aqueous extract of neem seed powder or cake or 2.5 and 5% emulsified neem oil than on water-treated corms. Feeding damage by larvae on banana pseudostem discs treated with 5% extract of powdered neem seed, kernel, or cake, or 5% emulsified neem oil was significantly less than on untreated discs. The larvae took much longer to locate feeding sites, initiate feeding and bore into pseudostem discs treated with extract of powdered neem seed or kernel. Few larvae survived when confined for 14 d on neem-treated banana pseudostems; the survivors weighed two to four times less than the larvae developing on untreated pseudostems. Females deposited up to 75% fewer eggs on neem-treated corms. In addition, egg hatching was reduced on neem-treated corms. The higher the concentration of neem materials the more severe the effect. © 2001 Entomological Society of America.

Keywords

Azadirachta indica, Banana, Cosmopolites sordidus, Neem

PubMed ID

11332838

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