Ecological Studies on Beet Fly Pegomyia mixta (Vill) Infesting Sugar Beet Plants and Their Associated Predators in Sharkia Governorate, Egypt

Habshy, Aml Al – Habshy

doi:10.21608/eajbsa.2018.25079

Ecological Studies on Beet Fly Pegomyia mixta (Vill) Infesting Sugar Beet Plants and Their Associated Predators in Sharkia Governorate, Egypt

Document Type : Original Article

Author

Aml Al – Habshy Habshy

Plant Prot. Res. Inst., Agric. Res. Cent., Dokii, Giza, Egypt

10.21608/eajbsa.2018.25079

Abstract

The present work was carried out at Diarb- Nigm district, Sharkia Governorate, during the two sugar beet seasons 2015/2016 and 2016/2017, to study the seasonal fluctuation and number of generations of Pegomyia mixta (Vill) and seasonal fluctuation of the predators Coccinella undecimpunctata (L.), Paederus alfierii (Koch.), Chrysoperla Carnea(Stephens), Scymnus sp.andtrue spiders. The seasonal fluctuation of P. mixta (eggs and larvae) on sugar beet plants recorded two peaks during each season. Peaks of eggs were recorded in 22^nd of February and 11^th of April, in the first season, while the second season, these peaks were recorded in 27^th of February and 17th of April. Peaks of larvae were recorded in 7^th of March and 18^th of April in the first season while the second season, it recorded in 13^th of March and 24^th of April. P. mixta eggs and larval were recorded were recorded three generations during each season. The peak of C. undecimpunctata and P. alfierii has occurred in 21^th of March and 20^th of March for the first and second seasons. The peak of C. Carneawas recorded in 14^th of March and 13^th of March for the two seasons. The peak of true spiders was recorded in 11^th of April and 17^th of April for the two seasons. The numbers of Scymnus sp was decreased for the two seasons.

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