| Abstract: In order to improve the control effect of Plutella xylostella, the population dynamics of Plutella xylostella larvae and adults in three monitoring sites including Chencang district, Fengxiang county and Taibai county were investigated and analyzed by using sex attractants. The results showed that number and trend of the population at the beginning, the peak and the peak of the monitoring point were different. The occurrence of Plutella xylostella larvae in Chencang district, Taibai county and Fengxiang county were May 24th, May 24th and May 31st, respectively. The occurrence of Plutella xylostella larvae in Chencang district had four peaks, which were May 31st, June 14th, July 5th and July 19th, respectively. The occurrence of Plutella xylostella larvae in Fengxiang county had three peaks, which were May 31st, June 28th and July 19th, respectively. There were 3 peak periods in Taibai county, namely, June 7th, June 21st and July 12th. The adult population of Plutella xylostella in Chencang district and Fengxiang county began on May 31st, the adult population of Plutella xylostella in Taibai county began on June 7th, and the adult population of Plutella xylostella in Chencang district had three peaks on June 14th, June 28th and July 19th, respectively. The occurrence of Plutella xylostella in Fengxiang county had two peaks on June 28th and July 19th, respectively.There were 2 peaks in Taibai county, which arised on June 21st and July 12th, respectively. |