تقدير الخسارة بالحاصل و شدة الاصابة بعثة درنات البطاطا Lepidoptera: Gelechiidae (Zeller) phthorimaea Operculella علي محصول البطاطا لموسمين زراعيين

A field experiment was carried out in autumn and springseason 2fi)8 an infestation percentage on Foliage was evaluatedreach (24Vo , 547o) and infestation intensity was (32 ,60Vo) . alsothe infestation percentage and infestation intensity were estimate atstorage for both seasons, on potato tubers was (10 ,lBVo) and ( 37,68vo)- an‎d the Yield loss was assessmentedat field and storage forthe same season were found to be (61 , SlTo) respectively.TheTotal Yield decreased to (796,850) Kg / planting area respectively .