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Survival and dispersal of young larvae of Chilo partellus (Swinhoe) (Lepi-doptera: Pyralidae) in two cultivars of sorghum

Published online by Cambridge University Press:  10 July 2009

R. F. Chapman ,
S. Woodhead  and
E. A. Bernays
R. F. Chapman
Affiliation:
Centre for Overseas Pest Research, College House, Wrights Lane, London WS 5SJ, UK.
S. Woodhead
Affiliation:
Centre for Overseas Pest Research, College House, Wrights Lane, London WS 5SJ, UK.
E. A. Bernays
Affiliation:
Centre for Overseas Pest Research, College House, Wrights Lane, London WS 5SJ, UK.
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Abstract

The establishment and survival of larvae of Chilo partellus (Swinh.) on two sorghum cultivars in the six days after hatching was investigated in the field in India. During this period relatively few larvae are present outside the whorls of the plants, and the numbers present six hours and three days after hatching are proportional to the numbers hatching. The number of larvae in the plants declines during these first three days, but subsequently is stable. Some dispersal to adjacent plants occurs during this period and, at the plant spacing used, approximately seven plants were infested by larvae from a single egg-mass of 40 eggs. The relative susceptibilities of the two cultivars, IS 1151 and IS 2205, altered with the age and size of the plants. This is a vulnerable period in the life-history of the insect and attention should be focused on it in developing resistant cultivars, but because the susceptibility of the plants changes with age it is important to decide the age at which protection would have the greatest economic value.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 73 , Issue 1 , March 1983 , pp. 65 - 74
Copyright
Copyright © Cambridge University Press 1983

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References

Bernays, E. A., Chapman, R. F. & Woodhead, S. (1983). Behaviour of newly hatched larvae of Chilo partellus (Swinhoe) (Lepidoptera: Pyralidae) associated with their establishment in the host–plant, sorghum.—Bull. ent. Res. 73, 75–83.CrossRefGoogle Scholar
Van hamburg, H. (1980). The grain–sorghum stalk–borer, Chilo partellus (Swinhoe) (Lepidoptera: Pyralidae): survival and location of larvae at different infestation levels in plants of different ages. — J. ent. Soc. sth. Afr. 43, 71–76.Google Scholar