Cold- hardiness of Locusta migratoria tibetensis in each developmental stage.
Author of the article:WANG Si- Zhong1 , LI Qing2** , FENG Chuan-Hong3 , ZHANG Min2 , JIANG Fan3 , YANG Gang4 , LUO Lin-Min
Author's Workplace：1 Chengdu Plant Park , Chengdu 610083, China; 2 Sichuan Agricultural University , Ya an 625014, China; 3 Plant Protection Station of Sichuan Agricultural Dep artment , Chengdu 610041, China; 4 Plant Protection and Quarantine Station of Ganzi State, Sichuan Kangding 626000, China
Key Words：Locusta migratoria tibetensis , super- cooling point, freezing point, cold- hardiness
Abstract：Locusta migratoria tibetensis Chen is an important pest of agriculture and animal husbandry in Qinghai- Tibet Plateau. The super- cooling point and freezing point of the L . migratoria tibetensis in each developmental stage were tested. The results indicated that the super- cooling point and freezing point of egg were the lowest among all stages, which was – 22.02℃and – 16.36℃, respectively. The super- cooling point and freezing point of 4th instar nymph were the highest among all nymph stages, which were – 6.46℃ and – 5.05℃ respectively. So L. migratoria tibetensis overwinters in egg in Ganzi State, Sichuan.