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Diamondback Moth in the Philippines and its Control with Diadegma semiclausum

Diamondback Moth in the Philippines and its Control with Diadegma semiclausum,Andreas Poelking

Diamondback Moth in the Philippines and its Control with Diadegma semiclausum   (Citations: 6)
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Diamondback moth, Plutella xylostella (L.), is the most destructive pest of crucifer crops in the Philippines. Life cycle, population dynamics and biological control with the larval parasitoid Diadegma semiclausum have been studied (1988-90) in the mountains of Northern Luzon. One generation of the diamondback moth requires 24.7 days, therefore about 15 generations of the pest may occur during 1 year. The average life expectancy of the females is 16.7 days, during which an average of 233 eggs (maximum 639) are deposited. The continuous monitoring of the diamondback moth field population with light and pheromone traps proved that during the rainy season (June- October) only 5-10 moths/week were found; during population peaks (January and February) almost 3000 moths/week were found. Only one natural enemy - Cotesia plutellae (Kurdjumov) has a certain importance in controlling the pest. The parasitism reaches 70% but its efficacy is reduced by hyperparasitism to 80% by a group of six hymenopterans. Starting in March 1989 D. semiclausum was imported from Taiwan. The performance of D. semiclausum was evaluated in field experiments with screen- covered cabbage plots. The parasitism reached 95%, and in two of three experiments the yield of cabbage was significantly higher than in the control. In an open-field experiment the parasitoid was established with rates of parasitism from 12 to 15% increasing to 64% at harvest time.
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