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New Zealand Plant Protection 65 (2012): 142-147

Reproductive fitness of Diadegma semiclausum Hellen (Hymenoptera: Ichneumonidae) in response to host density

D. Khatri, X.Z. He and Q. Wang

ABSTRACT

Diadegma semiclausum is an important larval parasitoid of diamondback moth (DBM), Plutella xylostella. The present study investigated the reproductive fitness of D. semiclausum females in response to host densities of 5 and 30 DBM larvae per cabbage seedling per day. Both the number of hosts parasitised and the number of female progeny produced over the life of the parasitoid were significantly greater in the 30 than the 5 host density (hosts parasitised: 60131 versus 12015 and female progeny produced: 6710 versus 122) (P<0.0001). In the high host density, the daily number of hosts parasitised and proportion of female progeny produced significantly increased from 3-4 days until 20-22 days after oviposition started, after which time these parameters significantly decreased (P<0.0001). The implication of these results for mass-rearing and field release is discussed.

Keywords: Diadegma semiclausum, Plutella xylostella, host density, female progeny, parasitism.

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