Effect of Overwintering Time on Survival Adults of Eurygaster testudinaria Geoffroy in Iraq

Abstract

A field study was conducted to determine the effect of overwintering time on the survival adult of Eurygaster testudinaria Geoffroy in Kufa/Najaf Governorate during the season 2019-2020. The results showed there is a difference in the survival rate of females and males according to the time of laying sunn pest in the overwintering site. The results showed the lowest survival rate for adults was in the first and second treatment of placing insects in overwintering site, and the maximum survival period for adults was three months. while the highest survival rate for females and males was 100 and 98% on the fourth treatment after a month of placing insects in overwintering site respectively, then this percentage gradually decreased until reached 77 and 66% at the end of January, respectively. The results also showed that the weight of sunn pest adults differed according to the date of entry the insect into overwintering site. The highest percentage of weight loss for females and males was 2.3,3.94% and 2.26,2.08% in the first and second treatment in May after a month from Putting insects in overwintering site respectively. The lowest percentage of weight loss was0.2 and 0.21% on the fourth treatment after a month of treatment, then this percentage gradually increased reached 3.22% at the end of January for females and 4.36% in December for males.