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Role Of Leptomastix dactylopii And Cryptolaemus montrouzieri In Reducing The Population Of The Citrus Mealybug, Planococcus citri On Citrus Trees Under Green House Conditions In Germany
- Ashraf A. H. Mangoud , Plant Protection Research Institute, Nadi El-Said Street, Dokki, Giza 12618, Egypt
Abstract
Under green house conditions in Germany, the role of Leptomastix dactylopii and Cryptolaemus montrouzieri were studied to reduce the population of the citrus mealybug, Planococcus citri on citrus trees. Four tree plots were used. In the first plot (10 adults and 15 larvae/ tree) release of C. montrouzieri on June 1, 2001 reduced infestation. Pest reduction following the release increased gradually from 0.7 in May before the release to 7.0, 13.7, 26.3, 45.1 and 74.0% in June, July, August, September and October, respectively. Fifteen individuals of L. dactylopii were released in the second plot. The results indicated that the level of parasitism following one time release gradually increased from 0.64% before release in May to 5.2, 10.2, 18.8, 26.3 and 35.7%, respectively in June, July, August, September and October. In the third plot (10 adults and 15 larvae/ tree) C. montrouzieri was released on the first (June 2001) followed by the release of L. dactylopii. The reduction of infestation and parasitism levels were calculated. Following the release of C. montrouzieri, the reduction of P. citri in the plot was increased gradually from 0.59 in May to 8.2, 20.3 and 34.5%, respectively in June, July and August. In August, 15 adults/tree of L. dactylopii were released and the parasitism level increased gradually to reach 98.1%. The results indicated that the release of both the predator, ladybird beetle, Cryptolaemus montrouzieri and Encyrtid parasitoid, Leptomastix dactylopii gave good reduction in the population of the citrus mealybug, Planococcus citri. Elimination of ants was very important, because ants feeding on the honeydew secreted by the mealy bug will prevent the parasitoids and predators from playing their role as biological control agents. |
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