The oviposition characteristics and threshold temperature of Plutella xylostella in the different vegetable

Key Words：Plutella xylostella，oviposition characteristics，threshold temperature，effective accumulate temperature

Abstract：    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.