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Insect predators in northeast China and their impacts on Aphis glycines

Published online by Cambridge University Press:  19 November 2012

Jian Liu ,
Weijun Xu ,
Qiuyu Wang  and
Kuijun Zhao
Jian Liu
Affiliation:
Northeast Forestry University Postdoctoral Programme, Heilongjiang Academy of Agricultural Sciences Postdoctoral Programme, 369 Xuefu Road, Harbin 150086, China; and College of Agriculture, Northeast Agricultural University, 59 Mucai St., Harbin 150030, China
Weijun Xu
Affiliation:
Institute of Plant Protection, Heilongjiang Academy of Agricultural Sciences, 369 Xuefu Road, Harbin 150086, China
Qiuyu Wang
Affiliation:
College of Life Sciences, Northeast Forestry University, 26 Hexing Road, Harbin 150040, China
Kuijun Zhao*
Affiliation:
College of Agriculture, Northeast Agricultural University, 59 Mucai St., Harbin 150030, China
*
1Corresponding author (e-mail: kjzhao@163.com).
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Abstract

Predators of Aphis glycines Matsumura (Hemiptera: Aphididae) were surveyed and their ability to suppress A. glycines population growth was determined in Harbin, northeast China (45.4°N, 126.4°E). Field surveys were conducted on 21 fixed sampling sites in 2004 and 17 in 2005. Impacts of natural enemies of A. glycines were studied using exclosure experiments. Thirteen natural enemies were found, the most abundant of which was Propylaea japonica (Thunberg), Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae), Chrysopa sinica Tjeder, Chrysopa phyllochroma Wesmael, Chrysopa formosa Brauer (Neuroptera: Chrysopidae), Hemerobius humuli Linnaeus (Neuroptera: Hemerobiidae), Orius Wolff sp. (Heteroptera: Anthocoridae), Nabis stenoferus Hsiao (Heteroptera: Reduviidae), Deraeocoris punctulatus (Fallén) (Heteroptera: Miridae), and Episyrphus balteata (De Geer) (Diptera: Syrphidae). Three exclosure treatment types were established, large-mesh cages, small-mesh cages, and no cages. In exclosures, A. glycines density in small-mesh cages peaked at numbers 3.75-fold higher than in large-mesh cages and 17.44-fold higher than on plants with no cages in 2004. In 2005, these numbers were 4.59-fold and 60.98-fold. Temperature was not a factor in exclosures, but relative humidity had significant effects. These results indicated that existing predator communities could partially suppress soybean aphid population density in soybean fields in northeast China.

Résumé

Nous avons fait l'inventaire des prédateurs d’Aphis glycines Matsumura (Hemiptera: Aphididae) et évalué leur capacité à réduire la croissance des populations d’A. glycines à Harbin dans le nord-est de la Chine (45,4°N, 126,4°E). Les inventaires de terrain ont été menés dans 21 sites d’échantillonnage fixes en 2004 et dans 17 sites en 2005. Nous avons déterminé les impacts des ennemis naturels d’A. glycines dans des essais en exclos. Nous avons répertorié treize ennemis naturels dont les plus abondants sont Propylaea japonica (Thunberg), Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae), Chrysopa sinica Tjeder, Chrysopa phyllochroma Wesmael, Chrysopa formosa Brauer (Neuroptera: Chrysopidae), Hemerobius humuli Linnaeus (Neuroptera: Hemerobiidae), Orius Wolff sp. (Heteroptera: Anthocoridae), Nabis stenoferus Hsiao (Heteroptera: Reduviidae), Deraeocoris punctulatus (Fallén) (Heteroptera: Miridae) et Episyrphus balteata (De Geer) (Diptera: Syrphidae). Trois types d'essais en exclos ont été réalisés, avec des cages à larges mailles, avec des cages à mailles fines et sans cages. Dans les exclos, la densité d’A. glycines dans les cages à mailles fines a atteint un maximum 3,75 fois plus élevé que dans les cages à mailles larges et 17,44 fois plus élevé que sur les plantes sans cages en 2004. En 2005, les valeurs respectives étaient de 4,59 et 60,98 fois. La température n'est pas un facteur dans les exclos, mais l'humidité relative produit des effets significatifs. Ces résultats indiquent que les communautés existantes de prédateurs peuvent en partie réduire la densité des populations de pucerons du soja dans les cultures de soja dans le nord-est de la Chine.

Type
Original Article
Information
The Canadian Entomologist , Volume 144 , Issue 6 , December 2012 , pp. 745 - 755
Copyright
Copyright © Entomological Society of Canada 2012

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