[Effects of brief exposure to high temperature on Neoseiulus californicus]

To determine the influence of high temperature shock on the survival characteristics and population development of N. californicus, the hatching rate, survival rate and developmental duration were investigated after the eggs, larvae and adults of N. californicus were exposed to high temperatures (35, 38, 42, 45 °C) for 1-8 h. The results showed that with higher temperature and longer time, the survival rate of eggs and larvae would be lower, and their developmental duration declined firstly and then increased. The hatching rate of eggs treated at 42 °C for 8 h was significantly lower than that at 35 °C for 8 h. The developmental duration of egg (4.1 d) was shortest when treated at 38 °C for 8 h. The egg couldn't hatch when treated at 45 °C for 2 h. The survival rate of larvae which was treated at 45 °C for 4 h was significantly lower than. that at 35 °C for 4 h, and the larvae wouldn' t survive when treated at 45 °C for 8 h. The spawning period and total eggs of female adults increased firstly and then decreased. The egg-laying amount of a female N. californicus was 38.9, 36.7 and 14.5 at 35, 38 and 45 °C, respectively. High temperature exposure had significant effects on the egg hatching rate, survival rate and development duration of N. californicus, but had little effect on the pre-oviposition and survival rate of the adults.