Predatory functional response and search efficiency of Chrysoperla carnea (Stephens) larvae with respect to the aphids Schizaphis graminum (Rondani) and Sitobion avenae (Fabricius)
Author of the article:BAI Wei-Wei；GAO Hai-Feng；ZHANG Hang；YANG An-Pei；AHTAM·Uwais；DING Rui-Feng；LI Guang-Kuo
Author's Workplace：Institute of Plant Protection, Xinjiang Academy of Agricultural Sciences, Key Laboratory of Integrated Pest Management on Crop in Northwestern Oasis, Ministry of Agriculture and Rural Affairs, Urumqi 830091, China;Institute of Plant Protection, Xinjiang Academy of Agricultural Sciences, Key Laboratory of Integrated Pest Management on Crop in Northwestern Oasis, Ministry of Agriculture and Rural Affairs, Urumqi 830091, China;Institute of Plant Protection, Xinjiang Academy of Agricultural Sciences, Key Laboratory of Integrated Pest Management on Crop in Northwestern Oasis, Ministry of Agriculture and Rural Affairs, Urumqi 830091, China;Institute of Plant Protection, Xinjiang Academy of Agricultural Sciences, Key Laboratory of Integrated Pest Management on Crop in Northwestern Oasis, Ministry of Agriculture and Rural Affairs, Urumqi 830091, China;Institute of Plant Protection, Xinjiang Academy of Agricultural Sciences, Key Laboratory of Integrated Pest Management on Crop in Northwestern Oasis, Ministry of Agriculture and Rural Affairs, Urumqi 830091, China;Institute of Plant Protection, Xinjiang Academy of Agricultural Sciences, Key Laboratory of Integrated Pest Management on Crop in Northwestern Oasis, Ministry of Agriculture and Rural Affairs, Urumqi 830091, China;Institute of Plant Protection, Xinjiang Academy of Agricultural Sciences, Key Laboratory of Integrated Pest Management on Crop in Northwestern Oasis, Ministry of Agriculture and Rural Affairs, Urumqi 830091, China
Key Words：Chrysoperla carnea (Stephens); Schizaphis graminum (Rondani); Sitobion avenae (Fabricius); functional response; searching effects
Abstract：
[Objectives] To evaluate the
predatory response and prey preferences of Chrysoperla
carnea (Stephens) larvae with respect to the aphids Schizaphis graminum (Rondani) and Sitobion avenae (Fabricius), and thereby clarify the effectiveness
of using C. carnea as a biological
control for these two kinds of wheat pest. [Methods] Different prey densities of S. graminum and S. avenae were created and the number of each prey species consumed
by 2nd instar and 3rd instar C. carnea larvae
was measured and compared and the functional response and search rate of C. carnea with respect to these prey
species was estimated. [Results] C. carnea larvae consumed
significantly fewer S. graminum than S. avenae at the same aphid densities.
The functional response of C. carnea larvae corresponded to both the HollingⅡand
the Holling Ⅲ functional response models.
The instantaneous attack rate of 3rd instar C.
carnea larvae on S. graminum and S. avenae was 1.089 and 1.106,
respectively, higher than that of 2nd instar larvae. Both C. carnea instars had a higher instantaneous attack rate and daily
maximum predation rate on S. avenae than S. graminum, and the processing times
of 2nd and 3rd instar larvae for S.
avenae were 0.005 d and 0.004 d, respectively, shorter than those for S. graminum. The optimal search density of C. carnea larvae for S.
avenae was higher than that for S.
graminum 2nd instar larvae had the highest search density, 39.200. The search efficiency of C. carnea for both aphids species
decreased with increasing prey density but C.
carnea had a higher search rate for S.
avenae and the downward trend was larger than that for S. graminum. [Conclusion] C.
carnea has considerable potential as a biological control for both S. graminum and S. avenae but prefers S.
avenae to S. graminum.