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1 August 2016 A Comparison of Novel Entomopathogenic Nematode Application Methods for Control of the Chive Gnat, Bradysia odoriphaga (Diptera: Sciaridae)
Guang-Ying Bai, Hua Xu, Ya-Qi Fu, Xiao-Ying Wang, Guang-Shuang Shen, Hai-Kun Ma, Xiaoling Feng, Jie Pan, Xi-Shu Gu, Yong-Ze Guo, Wei-Bin Ruan, David I. Shapiro-Ilan
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Abstract

Bradysia odoriphaga Yang & Zhang (Diptera: Sciaridae) is the most serious pest of Chinese chive, Allium tuberosum. Chemical pesticide application has become a necessary step to control B. odoriphaga after each of the four to six harvests during the growing season. We compared the effects of application type (nematode-infected cadaver, aqueous nematode suspension, and mixture of cadaver and aqueous suspension) and nematode species (Heterorhabditis bacteriophora vs. Steinernema carpocapsae) on B. odoriphaga control. Nematode species combinations and the use of the cadaver method has only been tested in a relatively few studies, and has not been tested for this target pest, B. odoriphaga. Furthermore, this is the first report of combining application methods (aqueous and cadaver). Results indicated that the cadaver treatment produced higher mortality of B. odoriphaga than the aqueous treatment, and H. bacteriophora caused higher mortality of B. odoriphaga than S. carpocapsae. The mortality of B. odoriphaga was 96.7% in H. bacteriophora cadaver treatment and only 27.5% in control treatment without nematode addition. Cadaver treatments caused higher biomass of A. tuberosum than that of aqueous treatment. The plant biomass in H. bacteriophora cadaver treatment was 10 folds as much as that in the control treatment. The mixed aqueous suspension of H. bacteriophora and S. carpocapsae did not increase the mortality in pot trial. Our findings indicate that entomopathogenic nematodes applied as cadavers might be a potential alternative biological agent in the integrated management of B. odoriphaga for Chinese chive production.

©The Authors 2016. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For Permissions, please email: journals.permissions@oup.com
Guang-Ying Bai, Hua Xu, Ya-Qi Fu, Xiao-Ying Wang, Guang-Shuang Shen, Hai-Kun Ma, Xiaoling Feng, Jie Pan, Xi-Shu Gu, Yong-Ze Guo, Wei-Bin Ruan, and David I. Shapiro-Ilan "A Comparison of Novel Entomopathogenic Nematode Application Methods for Control of the Chive Gnat, Bradysia odoriphaga (Diptera: Sciaridae)," Journal of Economic Entomology 109(5), 2006-2013, (1 August 2016). https://doi.org/10.1093/jee/tow162
Received: 23 February 2016; Accepted: 25 June 2016; Published: 1 August 2016
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KEYWORDS
biological control
cadaver
entomopathogenic nematode
Heterorhabditis bacteriophora
nematode suspension
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