Effects of Different Temperatures on Growth and Development of Laodelphax striatellus (Homoptera：Delphacidae)
The development and survival of Laodelphax striatellus population were investigated at five temperatures (18, 23, 25, 28℃and 33℃) with rice as the host.The results showed that the developmental duration of each instar of Laodelphax striatellus nymph reduced with the increase of temperature from 18℃ to 28℃, and there was a significant positive correlation between developmental rate and temperature.Further in-creasing temperature to 33℃, however,it significantly inhibited the nymph (2nd~3rd instar) development. The survival rate was higher at 18 ~28℃ and the highest at 28℃, while significantly declined at 33℃.At 18~33℃, female were all brachyptery, however male mostly were macroptery.And the number of female was more than that of male at relatively high temperature.Based on the linear regression method, the developmen-tal threshold temperatures of 1st , 2nd, 3rd, 4th and 5th instar nymph were 8.05, 14.64, 15.49, 14.43, 13.52℃respectively, and corresponding effective accumulated temperatures were 56.81, 23.67, 21.72, 28.37, 48.78 day-degree respectively.
Laodelphax striatellusGrowth and developmentDevelopmental durationWing typeSex ratio
国家科技期刊平台
NSTL
万方数据
维普
