Evaluation of Aqueous Solution of Neem Seed Extract Against Liriomyza sativae and L. trifolii (Diptera: Agromyzidae)
Authors: Webb, Ralph E.; Hinebaugh, Mark A.; Lindquist, Richard K.; Jacobson, Martin
Source: Journal of Economic Entomology, Volume 76, Number 2, April 1983 , pp. 357-362(6)
Publisher: Entomological Society of America
Abstract:Aqueous solutions of neem seed extract applied on leaves were evaluated for antiovipositional and insecticidal effects against the leafminers Liriomyza sativae Blanchard and L. trifolii (Burgess). All experiments but one were conducted with the primary leaves of Henderson bush lima bean as the host. Significantly fewer eggs were laid by L. trifolii females in neem-treated foliage than in water-treated foliage; such a difference in oviposition was not seen for L. sativae. However, larval mortality of both species shortly after hatch was high (100% for L. trifolii. 98.2% for L. sativae). Further work indicated that 2-to 6-h-old neem residues on leaves repelled adult L. sativae. thus reducing oviposition, but that 22-h-old residues were not appreciably repellent. Neem applied as a 0.1 % solution on leaves was active against 1- to 3-day-old L. sativae eggs (by killing larvae hatching from those eggs) as well as against all three larval instars. Against L. sativae eggs and larvae, neem was highly effective as 0.1 and 0.05% solutions (91 to 100% mortality) and moderately effective as a 0.025% solution (49 to 92% mortality). Neem applied on leaves was effective for up to 7 days in killing larvae hatching from eggs, but its effectiveness declined steadily from day 0 after application (86% mortality) to day 7 after application (44% mortality). Adults caged for 25 h with foliage freshly dipped in 0.1% neem extract showed no adverse effects. Similarly, neem extract (0.1%) applied on chrysanthemum leaves showed that adult L. trifolii were slightly inhibited from making ovipositor punctures in leaves. Leaf-miners failed to develop, however, and the neem-treated leaves contrasted with the control leaves, which contained numerous mines.
Document Type: Research Article
Publication date: April 1, 1983
- Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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