Population Fluctuation and Determination of The Economic Injury Level and The Economic Threshold for The Sugarbeet Fly, Pegomia hyo-scyami Curtis, in Nobaria Region, El-Behaira Governorate, Egypt. | ||
| Journal of the Advances in Agricultural Researches | ||
| Article 5, Volume 20, Issue 4, December 2015, Pages 630-641 PDF (152.28 K) | ||
| Document Type: Research papers | ||
| DOI: 10.21608/jalexu.2015.161606 | ||
| Authors | ||
| Ossman Zaghloul1; Magdy Abdelzaher1; Hassan Mesbah1; George Zarif2; Ragab Kandil2 | ||
| 1Faculty of Agric. (Saba Basha), Alex. Univ., Egypt. | ||
| 2Plant Protection Research Institute, Agric. Res. Center, Egypt | ||
| Abstract | ||
| Experiments were conducted in a private farm cultivated with sugarbeet crop (Top cv.) for the two successive seasons of 2013/2014 and 2014/2015 to determine the economic damage threshold levels of Pegomia hyo-scyami Curtis (Diptera: Anthomyidae) under field conditions in Nobaria region, El-Behaira Governorate, Egypt. The results showed that the relationship between the yield of sugarbeet and the infestation of sugarbeet fly, Pegomia hyo-scyami Curtis (Pegomyia mixta Vill.) was negative, which is means that an increase in larvae numbers caused a decrease in roots yield and vice-versa. In both seasons, Pegomyia hyo-scyami Curtis larvae registered two seasonal peaks of abundance that occurred in February and March. The determined economic threshold level for Pegomia hyo-scyami Curtis was 19 larvae / plant and the economic injury level was 22 larvae / plant in the first season. But the values were 21 larvae / plant and 22 larvae / plant, in respect, in the second season. | ||
| Keywords | ||
| Sugarbeet (Beta vulgaris L.); sugarbeet fly; Pegomia hyo-scyami Curtis; Pegomyia mixta Vill; Economic threshold (ETs); the economic injury level (EILs) and roots yield | ||
| References | ||
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