University of Khartoum

Some Aspects of Biology and Ecology of the Merican Bollworm Heliothis Armigera (Hb).

Some Aspects of Biology and Ecology of the Merican Bollworm Heliothis Armigera (Hb).

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Title: Some Aspects of Biology and Ecology of the Merican Bollworm Heliothis Armigera (Hb).
Author: Mohamed El Hassan Ali, El Hussein
Abstract: The American bollworm, Heliothis armigers (Hb.) (Noctuidae: Lepidoptera) is an important pest of cotton in the Sudan. The present studies, which were carried out in the Agricultural Research Corporation, Wad Madani, and in the Faculty of Agriculture, Shambat, describe some aspects of its biology and ecology. The life history of individuals whose larvae were reared on cotton and lubia buds was followed and the average total duration of the developmental stages was 33 and 29 days respectively. The type of food WBS found to affect the duration of development of immature stages and life span of the adult. Studies on egg hatching and adult emergence from pupae showed that hatching took place early in the morning and adult emergence took place at midnight. There were six larval instars and no pupal diapause was recorded. Extensive surveys were carried out both in the Gezira area and Shambat to record the range of host plants. Studies on the varietal susceptibility of cotton varieties have shown that Egyptian varieties (Barakat and 865 67/6) harboured more larvae during mid-season time (October-November) than did the American varieties (Acala 4/42 and Albar Res). No parasites were found and only one predator, the mud wasp (Eumenes maxil1osus De Geer) was found.
URI: http://khartoumspace.uofk.edu/handle/123456789/14847
Date: 2015-06-24


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