Effects of Depodding and Defoliation on the Yield and Quality of Lima Beans

Authors: Coggin, D. L.; Dively, G. P.

Source: Journal of Economic Entomology, Volume 73, Number 4, August 1980 , pp. 609-614(6)

Publisher: Entomological Society of America

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Abstract:

Lima bean plants were defoliated and depodded to simulate feeding injury caused by phytophagous insects. Defoliation decreased yields but the response was not the same at all maturity stages, Defoliation levels of 1/6, 2/3, and 3/3 caused yield reductions during the flat pod stage (ca. 24–36 days from harvest) but only complete leaf loss caused reductions at late prebloom, bloom-pin pod, and mature pod. Yield losses were associated with reductions in the number of pods and bean size. Pod maturation was delayed by defoliation prior to bloom and accelerated after. Depodding at the pin pod stage increased yields as a result of the compensatory ability of the plant to retain surplus pods and to increase bean size. Depodding had the greatest effect on yield during the flat pod stage when the compensatory response was negated by the marked reduction in the number of pods at harvest. Depodding at pin pod retarded pod maturation but had no effect at later maturity stages. Multiple regression models were developed for predicting yield response as a function of defoliation or depodding at any maturity stage of the plant.

Leaf area and pod production were measured at various growth stages to obtain morphological data on the development of the lima bean plant. Results from all studies were used to develop static economic injury levels for the Mexican bean beetle, Epilachna varivestis Mulsant, and corn carworm, Heliothis zea (Boddie).

Document Type: Research Article

Publication date: August 1, 1980

More about this publication?
  • 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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