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Your Position :Home->Past Journals Catalog->2014年51 No.1

Effects of suppression of natural enemies on cotton aphids
Author of the article:YU Han-Long1, 2** , MEN Xing-Yuan1**,LI Li-Li1 , ZHOU Xian-Hong1 ZHANG Si-Cong1 ,ZHUANG Qian-Ying1*
Author's Workplace:(1. Shandong Provincial Key Laboratory of Plant Virology, Institute of Plant Protection, Shandong Academy of Agricultural Sciences, Jinan 250100, China; 2. College of Plant Protection, Shandong Agricultural University, Tai’an 271018, China)
Key Words: seeding aphid, summer aphid, natural enemy, biocontrol services index
Abstract:

      [Objectives]  To evaluate the effects of suppressing natural enemies on cotton aphids on cotton seedlings and during summer. [Methods]  Field investigations and enclosures. [Results]  Propylaea japonica and Harmonia axyridis were the main natural enemies of aphids during the cotton seedling stage and could effectively suppress the aphid population achieving a biocontrol services index (BSI) > 91%. Araneae, Chrysopidae and Propylaea japonica were the main natural enemies of aphids in summer. These predators could not effectively suppress the population of summer aphids; because of low population densities and low natural enemy to aphid ratio the BSI was always < 20%. [Conclusion]  The results indicate that the effectiveness of natural enemies to control aphids in cotton fields varies between the seedling stage and summer.

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