Occurrence of diamondback moth Plutella xylostella and its parasitoids Apanteles plutellae within cabbage heads

Lim G.S., . and Tan C.L., . Occurrence of diamondback moth Plutella xylostella and its parasitoids Apanteles plutellae within cabbage heads. pp. 158-163. ISSN 0126-5709

In investigating the possible occurrence and survival of the diamondback moth (DBM) (Plutella xylostella L.) and its parasitoids (particularly Apanteles plutellae Kurd.) within cabbage heads two studies were carried out using freshly harvested cabbage heads ready for marketing. The cabbages were individually enclosed for two weeks for emergence of any infesting species and the leaves subsequently peeled to determine the stages of those still remaining within. In spite of the tight and closed conditions of the cabbage heads both DBM and its parasitoids were found within. The life stages included larvae and pupae of DBM and cocoons of the parasitoids. Most was found on the first 15 outer leaves while a few as far in as the 27th leaf. In unsprayed fields 46.7 of the heads had infestations within while that of sprayed heads 80. Only a very small percentage of the insects initially trapped within the heads failed to emerge. Many succumbed to diseases as indicated by their watery foul and disintegrated appearance. The fact that the moth may survive for extended period within cabbage heads has notable implications. This is discussed with respect to carry-over between different croppings insecticidal usage and the associated problem of insecticide resistance development and dispersal of the moth and its parasitoids.

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Abstract

In investigating the possible occurrence and survival of the diamondback moth (DBM) (Plutella xylostella L.) and its parasitoids (particularly Apanteles plutellae Kurd.) within cabbage heads two studies were carried out using freshly harvested cabbage heads ready for marketing. The cabbages were individually enclosed for two weeks for emergence of any infesting species and the leaves subsequently peeled to determine the stages of those still remaining within. In spite of the tight and closed conditions of the cabbage heads both DBM and its parasitoids were found within. The life stages included larvae and pupae of DBM and cocoons of the parasitoids. Most was found on the first 15 outer leaves while a few as far in as the 27th leaf. In unsprayed fields 46.7 of the heads had infestations within while that of sprayed heads 80. Only a very small percentage of the insects initially trapped within the heads failed to emerge. Many succumbed to diseases as indicated by their watery foul and disintegrated appearance. The fact that the moth may survive for extended period within cabbage heads has notable implications. This is discussed with respect to carry-over between different croppings insecticidal usage and the associated problem of insecticide resistance development and dispersal of the moth and its parasitoids.

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Item Type:	Article
Additional Information:	3 tables; 14 ref. Summaries (En Malay)
AGROVOC Term:	REPOLLO
AGROVOC Term:	PLUTELLA
AGROVOC Term:	HYMENOPTERA
AGROVOC Term:	INSECTICIDAS/ INFESTACION
AGROVOC Term:	LIQUIDOS PULVERIZABLES
AGROVOC Term:	PARASITOS
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:54
URI:	http://webagris.upm.edu.my/id/eprint/18987

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