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Articles

Biological and ecological studies on the sugar-beet fly, Pegomyia mixta Vill. (Diptera: Anthomyiidae) on sugar-beet in Egypt

, &
Pages 1557-1562 | Received 05 Oct 2013, Accepted 14 Oct 2013, Published online: 30 Oct 2013
 

Abstract

The sugar-beet fly, Pegomyia mixta Vill., is the most serious insect pest affecting sugar-beet plantations in Egypt. This study wase carried out in field in the El-Nubaria region ofEl-Behare Governorate. Peak numbers of flies were taken in sweep nets in December. Development of the fly appeared to be restricted to the months between November and May. In the hot months, adults were most active early in the morning and late in the afternoon, but in the cold months the peak of activity occurred at about midday. The flies were generally found on the upper surfaces of the leaves at temperatures below 16 °C and on the lower surfaces at temperatures above 24 °C. Females were generally more numerous than males. The eggs were observed from the first week of November to the end of April; the population was three blotches of eggs and 17 larvae/20 plants. The highest infestation of this insect in El-Nubaria was recorded at the end of March in both seasons (10 blotches of eggs, 20 larvae, and five pupae, and 12 blotches of eggs, 22 larvae, 13 pupae, respectively). The eggs are deposited in groups (3–8 eggs). The larvae bore its blotch in the leaf, about 3–7 larvae may be found in one blotch.

Acknowledgement

The authors thank the project No. (80/40/716). The development of integrated management of the sugar-beet crop to improve its productivity of quantity and quality. Financial support was provided by the National Research Center.

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