Small scale field trials using the egg parasitoid trichogrammatoidea bactrae (Nagaraja) to control the diamondback moth Plutella xylostella (L.) on Chinese Kale
1999
Jiraporn Petcharat (Prince of Songkla Univ., Songkhla (Thailand). Faculty of Natural Resources | National Biological Control Research Center (Southern Regional Center))
2o evaluate the efficiency of the egg parasitoid Trichogrammatoidea bactrae (Nagaraja) (Hymenoptera : Trichogrammatidae) in controlling the diamondback moth (DBM) Plutella xylostella (L.) (Lepidoptera : Yponomeutidae), numbers of DBM larvae in no-parasitoid-released (untreated/control) and parasitoid-released plots (treated) were compared. The parasitoid-released plots were obtained by releasing egg parasitoids in a plot after the DBM-host plant (Chinese kale) was 30 days old. A piece of paper containing about 470 rice moth eggs which had been parasitized by T. bactrae was clipped under a kale leaf at a rate of 3 pieces/subplot/day for 7 days. Two days after the egg parasitoids were released, 10 adult female DBMs/subplot were released in both 'no-parasitoid-released plots' and 'parasitoid-released plots' (200 female DBMS/plot, in total). Four days after the adult female DBMs were released, kale leaves were randomly observed at a rate of 8 leaves/subplot for DBM larvae. It was found that there were 0.406+-0.295 DBM larvae/leaf in no-parasitoid-released plots compared with 0.019+-0.046 DBM larvae/leaf in parasitoid-released plots.
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