Role of a hymenopteran parasite and a bacterium in the regulation of a lepidopteran pest in a tropical ecosystem

Mathavan S., . and Christopher M.S.M., . (1986) Role of a hymenopteran parasite and a bacterium in the regulation of a lepidopteran pest in a tropical ecosystem. [Proceedings Paper]

Mortality due to bacterial infection and parasitism by Apanteles glomeratus was observed in the natural population of Catopsilia crocale a defoliator of ornamental and medicinal plant Cassio alata. Regular field observations during the 1980-81 and 1981-82 seasons revealed that mortality due to these factors was mostly confined to the final instar and pupa of C. crocale. A direct correlation was obtained between population density of C. crocale and the number of larvae increased from 8 at the beginning of the season May to a maximum of about 50 at the end of the season December. However larval mortality due to the bacterium remained almost constant 10 throughout the season. Pupal mortality during the season ranged between 10 to 55 by A. glomeratus and 0 to 32 by the bacteria. Since the incidence of the hymenopteran parasite and bacterium fluctuated with the C. crocale population the were considered as potential biological control agents. efforts were being made to mass-rear A. glomeratus in the laboratory for field release.

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Abstract

Mortality due to bacterial infection and parasitism by Apanteles glomeratus was observed in the natural population of Catopsilia crocale a defoliator of ornamental and medicinal plant Cassio alata. Regular field observations during the 1980-81 and 1981-82 seasons revealed that mortality due to these factors was mostly confined to the final instar and pupa of C. crocale. A direct correlation was obtained between population density of C. crocale and the number of larvae increased from 8 at the beginning of the season May to a maximum of about 50 at the end of the season December. However larval mortality due to the bacterium remained almost constant 10 throughout the season. Pupal mortality during the season ranged between 10 to 55 by A. glomeratus and 0 to 32 by the bacteria. Since the incidence of the hymenopteran parasite and bacterium fluctuated with the C. crocale population the were considered as potential biological control agents. efforts were being made to mass-rear A. glomeratus in the laboratory for field release.

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Item Type:	Proceedings Paper
Additional Information:	Summary En
AGROVOC Term:	HYMENOPTERA
AGROVOC Term:	LEPIDOPTERA
AGROVOC Term:	CONTROL BIOLOGICO
AGROVOC Term:	BACTERIA GRAM NEGATIVA
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:25
URI:	http://webagris.upm.edu.my/id/eprint/14001

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