Investigaton and Occurrence Forecast to Leptinotarsa decemlineata(Say) in Qinghai Province

Leptinotarsa decemlineata(Say) is one of nine quarantine insects on plant quarantine pest list in China.The risk of diffusion and extension that the central was Xingjiang were continuously aggravated,Qinghai was the high risk district of Leptinotarsa decemlineata(Say),so it was necessary to monitor and control pest epidemic.The investigation suggested that there was no occurrence on Leptinotarsa decemlineata(Say) in Qinghai.With effective accumulative temperature method combined Qinghai climate features,the result show that the theoretic number of occurrence generations to Leptinotarsa decemlineata(Say) was 1-2 generation in Qinghai.