ABESTRACT: 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 hyoscyami 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.
Field experiments were conducted in a private vineyard located at kilo 54 th Cairo-Alexandria Desert Road in the New Sphinx City, Cairo, Egypt, throughout two successive seasons (2020 and 2021). The present investigation was adopted for attaining eco-friendly, and safer protection strategy for controlling fruit of fly Ceratitis capitata on grape by mass attracting traps. Also, the study aimed to determine the susceptibility of two seedless grape varieties, representing white-and red grape, to fruit fly infestation. Three types of mass attracting traps namely: Jakson, McPhail and Fly CAP were experimented for catching medfly adults. Moreover, sequence of partiall sprays of Buminal with one of two insecticides (Malathion 57% and/or Tracer 24%) that concurrently used with used traps were also evaluated. Generally, caught fruit flies started from the third decade interval (21 st : 30 th of April) and continued up to the end of May. Meanwhile, the highest mean of G-FTD was observed through the first decade of May, especially in the white grape variety (21.33 and 9.78 in seasons 2020 and 2021, respectively). The results indicate that, thin thickness of fruit skin and/or the white yellowish color of grape berries could enhance a high attraction of the Medfly, more than that of red grape berries.Jackson paper yellow trap showed an early high ability in capturing the fruit fly at the beginning of the 2 nd decade of April. Meanwhile, McPhail trap was the superior tested throughout the preharvest interval. Also, the results strongly indicate that both insecticides (malathion and Spinosad) that mixed with Buminal used in the partial sprays could increase the insect's orientation to food baits in Fly CAP and McPhail traps. It is clear that applying partial spray treatment concurrently with attracting traps highly decreased the mean number of captured medflies indicating a good Eco-friendly strategy to control this insect pest.
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