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Title:Selective feeding on green bean Phaseolus vulgaris by Heliothis zea
Author(s):Naeem, Mohammad
Doctoral Committee Chair(s):Waldbauer, G.P.
Department / Program:Entomology
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Biology, Entomology
Agriculture, Plant Pathology
Abstract:First and early second instar Heliothis zea larvae, feeding on the green bean Phaseolus vulgaris, fed preferentially on the leaf. The leaf feeding tendency decreased after about 12 h in the second instar. Third, fourth and fifth instar larvae fed preferentially on bean pod. Leaf-fed last instar larvae had lowered growth rate and weight gain, due largely to a lower rate of feeding rather than an inability to utilize leaves efficiently for growth.
Overall utilization efficiencies did not differ between last instar larvae fed seeds or a mix of seeds and pulp. Larvae fed either seeds or a mix ate significantly less and completed the instar in a significantly shorter time than larvae fed only on pulp. Seed-fed larvae, however, ate significantly less and had a higher ECD than larvae that either fed on the mix or pulp alone. Pulp contained about 93-95% water as compared to the 84-86% water content of seeds. Pulp-feeding larvae increased their fresh weight RCR to about 2.9 times that of seed-fed larvae and about 1.8 times that of mix-fed larvae by increasing the time spent feeding and decreasing the interfeed gaps. (Abstract shortened with permission of author.)
Issue Date:1990
Rights Information:Copyright 1990 Naeem, Mohammad
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9114356
OCLC Identifier:(UMI)AAI9114356

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