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An Alternative Approach for Evaluating the Efficacy of Potential Biocontrol Agents of Weeds. 2. Path Analysis

Published online by Cambridge University Press:  12 June 2017

Dan J. Pantone ,
William A. Williams  and
Armand R. Maggenti
Dan J. Pantone
Affiliation:
Dep. Agron. and Range Sci., Univ. California, Davis, CA 95616
William A. Williams
Affiliation:
Dep. Agron. and Range Sci., Univ. California, Davis, CA 95616
Armand R. Maggenti
Affiliation:
Dep. Nematol., Univ. California, Davis, CA 95616
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Abstract

Path analysis was used to assess the efficacy of the fiddleneck flower gall nematode as a weed biocontrol agent of coast fiddleneck in competition with wheat during 2 yr of field experiments. The path analysis revealed that the number of inflorescences/plant for fiddleneck and the number of heads/plant for wheat were the most important yield components that determine fecundity and seed yield. The density of fiddleneck had a much greater impact on the yield components of fiddleneck than did the density of wheat or the nematode rate of inoculation. The nematode had its greatest negative impact on the number of seeds/flower of fiddleneck and its greatest positive impact on the number of heads/plant of wheat. Path analysis predicts that a biocontrol agent that has a large negative direct effect on the number of inflorescences/plant for fiddleneck would be more efficacious in decreasing fecundity and seed yield than an agent that only impacts the number of flowers/inflorescence, seeds/flower, or biomass/seed.

Keywords

Coast fiddleneck, Amsinckia intermedia Fischer and Meyer ♯3 AMSINwheat, Triticum aestivum L. ‘Anza’fiddleneck flower gall nematode, Anguina amsinckiae (Steiner and Scott, 1935) Thorne, 1961Yield componentsbiological controlcompetitioninterferencenematodesAmsinckia intermediaTriticum aestivumAnguina amsinckiaeAMSIN
Type
Weed Biology and Ecology
Information
Weed Science , Volume 37 , Issue 6 , November 1989 , pp. 778 - 783
Copyright
Copyright © 1989 by the Weed Science Society of America 

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