Introduction of Trichogramma pretiosum Riley against Heliothis armigera Hb. in the Sudan

Munir B., . and Stam P.A., . and Abdelrahman A.A., . and Mohammed A.H., . (1990) Introduction of Trichogramma pretiosum Riley against Heliothis armigera Hb. in the Sudan. [Proceedings Paper]

The American bollworm Heliothis armigera is a serious pest of cotton and other crops in the Sudan. Several applications of insecticides are required early in the season to suppress its populations on cotton. These measures have a drastic effect on the natural enemies which are just getting established in the cotton fields. The decimation of beneficial organisms results in the upsurge of jassids aphids and the whitefly which need further applications of pesticides during the season. In order to avoid the early use of pesticides and their subsequent effects it was deemed necessary to control the American bollworm by non-chemical methods. Since the egg stage of this pest did not have any native species of parasitoid it was decided to introduce one from abroad. Trichogramma pretiosum was selected and introduced from Texas. It was mass bred in Holland and released in commercial cotton fields at Rahad during October 1988. The parasitoid became colonized and yielded about 30 percent parasitism during 1988/89 season. After the cotton was harvested it survived the hot and dry summer from April to July on weedy and vegetable host plants of the American bollworm and was recovered from cotton in September 1989 indicating the succesful establishment. Extensive dispersal and substantial parasitism was observed during the 1989/90 season. It is envisaged that the biological control of H. armigera will indirectly affect the populations of three major pests of cotton owing to the conservation of their natural enemies through withholding of early season applications of pesticides

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Abstract

The American bollworm Heliothis armigera is a serious pest of cotton and other crops in the Sudan. Several applications of insecticides are required early in the season to suppress its populations on cotton. These measures have a drastic effect on the natural enemies which are just getting established in the cotton fields. The decimation of beneficial organisms results in the upsurge of jassids aphids and the whitefly which need further applications of pesticides during the season. In order to avoid the early use of pesticides and their subsequent effects it was deemed necessary to control the American bollworm by non-chemical methods. Since the egg stage of this pest did not have any native species of parasitoid it was decided to introduce one from abroad. Trichogramma pretiosum was selected and introduced from Texas. It was mass bred in Holland and released in commercial cotton fields at Rahad during October 1988. The parasitoid became colonized and yielded about 30 percent parasitism during 1988/89 season. After the cotton was harvested it survived the hot and dry summer from April to July on weedy and vegetable host plants of the American bollworm and was recovered from cotton in September 1989 indicating the succesful establishment. Extensive dispersal and substantial parasitism was observed during the 1989/90 season. It is envisaged that the biological control of H. armigera will indirectly affect the populations of three major pests of cotton owing to the conservation of their natural enemies through withholding of early season applications of pesticides

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Item Type:	Proceedings Paper
Additional Information:	Summary En
AGROVOC Term:	GOSSYPIUM
AGROVOC Term:	CONTROL DE INSECTOS
AGROVOC Term:	SUDAN/ HELICOVERPA ARMIGERA
AGROVOC Term:	TRICHOGRAMMA PRETIOSUM
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:26
URI:	http://webagris.upm.edu.my/id/eprint/15274

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