Latest Cover

Online Office

Contact Us

Issue:ISSN 2095-1353
           CN 11-6020/Q
Director:Chinese Academy of Sciences
Sponsored by:Chinese Society of Entomological;institute of zoology, chinese academy of sciences;
Address:Chaoyang District No. 1 Beichen West Road, No. 5 hospital,Beijing City,100101, China
Tel:+86-10-64807137
Fax:+86-10-64807137
Email:entom@ioz.ac.cn
Your Position :Home->Past Journals Catalog->2011年48 No.2

Population dynamics of Plutella xylostella in cruciferae plants and contact toxicity of insecticides to it in Shanxi area
Author of the article:
Author's Workplace:
Key Words: Shanxi, Plutella xylostella, population dynamics, contact toxicity
Abstract:        population dynamics of the diamondback moth, Plutella xylostella (L.) feeding on 3 cruciferous plants in the Shanxi area were investigated in 2009 and 2010. Over the same period, the contact toxicity of insecticides introduced to control P. xylostella was evaluated. Differences in the population dynamics of P. xylostella between 2009 and 2010 were due to different weather conditions in these years. In 2009, P. xylostella first appeared on April 1st, two clear peaks of abundance occurred in late April and late May, respectively and there was no clear peak of abundance in the fall. The 1st generation eggs were laid on May 8th and the 1st generation pupae were found on May 18th. The total quantity of eggs and larvae peaked on May 13th and September 1st, and on May 23th and September 16th, respectively. In 2010, P. xylostella first appeared on March 15th, and three different peaks of abundance occurred in early April, late May to early June and mid-October. 1st generation eggs were laid on May 26th and 1st generation pupae were found on June 5th. The total quantity of eggs and larvae peaked on May 15th and September 25th, and June 15th and October 10th, respectively. Numbers of P. xylostella on vegetables were higher than on weeds in 2009 and 2010. Contact toxicities of the 11 insecticides were tested using the leaf dipping bioassay method. The results indicate that Spinosad was the most toxic with an LD50 value of 0.01 μg/ larva. Chlorfluazuron, Diafenthiuron and Tebufenozide were more toxic than the other pesticides tested, having LD50 values of 0.34, 0.28 and 0.10 μg/ larva, respectively. Cypermethrin and Cartap were the least toxic, with LD50 values of 91.53 and 84.36 μg / larva, respectively.
CopyRight©2024 Chinese Journal of Aplied Entomology