دراسة مختبرية و حقلية لبعض الأنشطة الحياتية لحشرة ذبابة القرعيات الكبرى (Wiedeman)‎ Dacus IongistyIus على نبات البطيخ في المعهد التقني الشطرة

الملخص EN

This study condueted Thi-Qar goverment, technical institute of shatrah at 2012 agricultural seasons, To study the sex ratio and determine the number of generation of the insect fly cucurbits major Dacus longistylus plant water melon.

The results showed that there were four generations appeared in the year to this insect, the first generation appeared at half of September (15 insect / trap) when the temperature degree and relative humidity means were 30 – 32 Co and 25–30 % in series , so the high mean of adult insect appeared in the fourth generation ( 80 insect / trap ) in the half of November when the rate temperature degree between 27 Co and the range of relative humidity was 42 % , so the study showed that the female : male ratio was in the above generations 1:1.ln the laboratory found that the process of mating occur during the day and the process takes from 4-6 hours where the maIe contact with the female so that stretches the back of the female and tsttal egg-laying machine to attach the mselves to male Bmukrh .

The results showed too that the adult insects began to disappear at the beginning of January because of low temperature , so the insects was disappeared too at spring season.

The study showed that the eggs bewailing were at high mean in the sixth and fourteenth days of the month of November (13.33 and 13.33 bewailing) when the low mean for eggs bewailing were in the sixteenth and eighteenth days of the month of December (9 and zero bewailing) in series.