Effects of Thrips palmi and Western Flower Thrips (Thysanoptera: Thripidae) on the Yield, Growth, and Carbon Allocation Pattern in Cucumbers
Authors: WELTER, STEPHEN C.; ROSENHEIM, JAY A.; JOHNSON, MARSHALL W.; MAU, R. F.L.; GUSUKUMA-MINUTO, LAURA R.
Source: Journal of Economic Entomology, Volume 83, Number 5, October 1990 , pp. 2092-2101(10)
Publisher: Entomological Society of America
Abstract:Mixed infestations of thrips, composed of ::.:94% Thrips palmi Karny and 6% Frankliniella occidentalis (Pergande). resulted in significant reductions in total cucumber yield, mean fruit size, and total fruit. No significant reductions were observed at <9.4 thripsdays/ em' (0.48 thrips/em' at peak densities). As the number of thrips-days increased to a maximum of 45.0 per em', reductions of 54.2% in total fruit weight at final harvest were observed. Highly significant linear regressions between the total number of thrips-days per leaf and the various agronomic variables were obtained. Total yields for the season were reduced 10% by the highest level of thrips damage, possibly because 70% of all yield was harvested before significant build up of thrips populations. Moderate, yet significant, changes in growth patterns were associated with feeding damage by thrips. Less total leaf dry weight was associated with heavy feeding damage.
Document Type: Research article
Publication date: 1990-10-01
- 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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