تأثير درجات الحرارة في تطور الحشرة القشرية البنية الرخوة (Coccus hesperidum L.)‎ تحت الظروف المخبرية

الملخص EN

The rate of growth of the brown soft scale, Coccus hesperidum L.

(Coccidae: Hemiptera) was studied under five different constant temperatures: 18, 21, 24, 27 and 30°C.

Results showed that increase in temperature reduced the rate of development for all the stages of C.

hesperidum Thus, the development from crawler to adult at 18 and 30°C were 49.75 and 28.5 days, respectively.

There was a higher correlation between temperature and growth rate for all insect stages using polynomial regression.

The results showed that there was a difference in Lower Development Threshold (LDT) and Sum of Effective Temperatures (SET) between the insect stages.

The LDTs were 16.7, 15.2, 9.3, 13.7, 11.5 and 15.6°C, and SETs were 36.4, 200.8, 166.9, 143.3, 125, 3 and 672.4 degree-days for each of crawler, first, second, third instar nymphs, adult and complete generation duration, respectively.