Effect of field infestations of immature pigeonpea ( Cajanus cajan (L.) Millsp.) pods on production of active (flight) and sedentary (flightless) morphs of Callosobruchus chinensis (L.)

Effect of field infestations of immature pigeonpea ( Cajanus cajan (L.) Millsp.) pods on production of active (flight) and sedentary (flightless) morphs of Callosobruchus chinensis (L.)

A study conducted in Uganda on Callosobruchus chinensis showed that adults emerging from dry seed-infested and immature pod-infested pigeonpea differed in a number of morphological and biological characteristics in one or both sexes. Adults emerging from dry seed-infested pigeonpea were more or less...

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Bibliographic Details
Published in:Journal of stored products research Vol. 35; no. 4; pp. 339 - 354
Main Authors: Nahdy, M.Silim, Silim, S.N, Ellis, R.H
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 01-10-1999
Elsevier Science
Subjects:
Biological and medical sciences
Bruchidae
Cajanus cajan
Callosobruchus chinensis
Field infestation
Fundamental and applied biological sciences. Psychology
Invertebrates
Medically important nuisances and vectors, pests of stored products and materials: population survey and control
Pests of stored products
Phytopathology. Animal pests. Plant and forest protection
Pigeonpea ( Cajanus cajan)
Polymorphism
Protozoa. Invertebrates
Records, symptoms, damages, economic importance, population surveys
Uganda
East Africa
Africa
Field infestation
Pigeonpea ( Cajanus cajan)
Callosobruchus chinensis
Polymorphism
Coleoptera
Insecta
Tropical zone
Flight
Cajanus cajan
Pest
Pest behavior
Dicotyledones
Angiospermae
Bruchidae
Emergence
Sexual dimorphism
Pod
Stored food product
Animal active movement
Grain legume
Animal activity
Leguminosae
Arthropoda
Morphology
Body size
Pigeon pea
Spermatophyta
Invertebrata
Infestation
Field study
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Summary:A study conducted in Uganda on Callosobruchus chinensis showed that adults emerging from dry seed-infested and immature pod-infested pigeonpea differed in a number of morphological and biological characteristics in one or both sexes. Adults emerging from dry seed-infested pigeonpea were more or less uniform in a number of these characteristics; in contrast, adults emerging from green pod-infested pigeonpea differed depending upon when they emerged: the differences were greatest between those emerging during the 2nd to the 6th days from first emergence, and those emerging from the 8th to the last days of emergence. In one or both sexes, these differences were expressed in terms of elytral hue and size, body length, distance between the compound eyes, length of pygidium, body water content, pre-maturation periods, fecundity and adult longevity. We suggest that these differences are due to polymorphism, and specifically the predominance of flight forms among late emergers from pod-infested pigeonpea. The differences observed in the two morphs of C. chinensis and ascribed to the flight and flightless forms, are thought to be adaptations for survival and propagation under field and storage conditions, respectively. The predominance of emerged adults of the flightless forms from dry seed and the flight forms from green pods were associated with low moisture content in dry seed and high moisture content in green pods, respectively. These observations show that bruchid control measures are needed in the field as well as in storage.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0022-474X
1879-1212
DOI:10.1016/S0022-474X(99)00017-X