云南不同菜区小菜蛾的产卵规律与发育起点温度

在室内不同温度条件下(15～27℃,RH60%～70%),系统测定了云南不同菜区小菜蛾Plutella xylostella(L.)的产卵规律、发育起点温度和有效积温。结果表明,云南不同菜区小菜蛾的产卵规律、发育起点温度和有效积温有所不同,差异显著,呈现不同的区域性种群特征。(1)玉溪市通海县、昆明市呈贡县、红河州石屏县和曲靖市陆良县的小菜蛾单雌产卵量分别为213.0、182.5、132.2和71.6粒,区域间差异显著,以通海县小菜蛾种群的产卵量为最高,陆良县的最低;产卵天数分别为7.76、5.81、7.0和3.63d。(2)玉溪市通海县、昆明市呈贡县、红河州石屏县、曲靖市陆良县和大理州弥渡县的小菜蛾全世代发育起点温度分别为:(9.5±0.5)、(10.0±0.5)、(9.3±1.0)、(9.2±0.7)和(9.4±0.8)℃;有效积温分别为:(407.2±17.2)、(404.5±15.4)、(419.2±29.6)、(383.0±20.5)和(398.0±23.9)日·度。

The oviposition characteristics and threshold temperature of Plutella xylostella in the different vegetable planting region of Yunnan Province

The oviposition characteristics,threshold temperature and effective accumulated temperature of Plutella xylostella（L.）were investigated under different temperature conditions in a laboratory（15-27℃,RH 60% -70%）.The results showed that the oviposition characteristics,threshold temperature and effective accumulated temperature of P.xylostella from different areas were significantly different.Oviposition rates in Tonghai County,Kunming City,Shiping County and Luliang County were 213.0、182.5、132.2 and 71.6 eggs ∕ female,respectively and the respective oviposition periods for these localities were 7.76、5.81、7.0 and 3.63 days.Threshold temperatures of all generations in Tonghai County,Kunming City,Shiping County,Luliang County and Midu County were（9.5 ± 0.5）,（10.0 ± 0.5）,（9.3 ± 1.0）,（9.2 ± 0.7）,and（9.4 ± 0.8）℃,respectively,and the respective accumulated temperatures for these locations were（407.2 ± 17.2）,（404.5 ± 15.4）,（419.2 ± 29.6）,（383.0 ± 20.5） and（398.0 ± 23.9） degree-days.