title: Effects of neem seed derivatives on behavioral and physiological responses of the Cosmopolites sordidus (Coleoptera: Curculionidae).
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.
authors.affiliation: International Centre of Insect Physiology and Ecology, Nairobi, Kenya.
authors.forename: T
authors.initials: T
authors.lastname: Musabyimana
authors.forename: R C
authors.initials: RC
authors.lastname: Saxena
authors.forename: E W
authors.initials: EW
authors.lastname: Kairu
authors.forename: C P
authors.initials: CP
authors.lastname: Ogol
authors.forename: Z R
authors.initials: ZR
authors.lastname: Khan
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D001517:Coleoptera / Q000254:growth & development / Q000502:physiology*; D005247:Feeding Behavior; D005260:Female; D005989:Glycerides; D007300:Insect Control / Q000379:methods; D010058:Oviposition; D010063:Ovum; D012639:Seeds; D013729:Terpenes; D014197:Trees
chemical_list: D005989:Glycerides; D013729:Terpenes; C002443:neem oil