Effect of Temperature on the Development and Reproduction of Cassava Green Mite Mononychellus tanajioa
Mononchellus tanajioa,resulting in great loss in yield or even no harvest in Africa and South America,is a new invasion quarantine mite in China.The influence of temperature on the development and reproduction of M.tanajioa were investigated to reveal its ecological suitability as well as its invasion and spread mechanism.The results showed that temperature,especially high temperatures had important effect on the development and reproduction of M.tanajioa.The development duration of M.tanajioa was the longest in 21 ℃,(370±12) h,and that was the shortest in 39 ℃,(224±24) h.The tolerance of M.tanajioa to high temperature was lower than Tetranychus cinnabarinus,a vastly distributed mite in China.42 ℃ was the extremely high temperature for development and reproduction of M.tanajioa larvae,protonymphs,deutonymphs and adults.The egg hatching rate were 0 and the larvae,protonymphs,deutonymphs could not develop to the next stage and died in 66 h under 42 ℃ exposures,as well as the newly emerged adults.In 36 ℃ and 39 ℃,the development duration was the shortest and the growth was the quickest of all mites,but the fecundity of the females was decreased significantly,and the hatchability of eggs was only 32.1% and 13.4%,respectively.The fittest temperature range was about 24 ℃~27 ℃ for M.tanajioa.