Effects of temperature on development and reproduction of Ascotis selenaria

Abstract

For better prediction with effective integrated management on soybean from Ascotis selenaria in field,temperature effects were studied on A. selenaria development in greenhouse. At a series of temperature( 22,25,28,31 and 34 ℃),the developmental period,growth rate,survival rate,reproduction,threshold temperature and effective accumulative temperature for different stages on host soybean were investigated. Results showed that development duration of every stage of A. selenaria reduced with increasing temperatures from 22- 31℃. There was a positive correlation between temperature and growth rates of egg,larva,pupa and prepupa. Under 34℃ the egg hatching rate decreased sharply and the 6th instar larva stopped developing and died,while 1 to 5 instar larva developed normally. Egg hatching rate was above 98% at 22- 28℃,while survival rate of larvae and pupae were the highest at 28℃. Threshold temperature for egg,larva and prepupa were 6. 68,9. 10 and 10. 97℃,and the effective accumulated temperature were 88. 96,333. 41 and 33. 97 d·℃ respectively. Insect fecundity was the highest at 31℃,with average 754. 83 eggs laid per female,followed by 726. 28 eggs laid per female at 28℃.