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An Alternative Approach for Evaluating the Efficacy of Potential Biocontrol Agents of Weeds. 1. Inverse Linear Model

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. Nematology, Univ. California, Davis, CA 95616
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Abstract

Methods for evaluating the efficacy of potential classical biocontrol agents were outlined for a model biocontrol agent-weed-crop system. A proposed biocontrol agent (the fiddleneck flower gall nematode), its weed host (coast fiddleneck), and wheat were used as representative organisms. An additive experimental design (inverse linear model) was used. Regression of the reciprocal of the average plant biomass of each species onto the density of itself and the other plant species yielded competitive indices that measure the competitive ability of the plants. The results of 2 yr of field experiments revealed a dramatic change in the competitive interaction between fiddleneck and wheat due to the nematode. During the 1986–87 season in the absence of the nematode, fiddleneck intraspecific competition was 33 times stronger than interspecific competition with wheat. In the presence of the nematode, intra- and interspecific competition of fiddleneck were nearly equal. Only the coefficients that measure interspecific competition changed significantly in the presence of the nematode while the coefficients for intraspecific competition did not.

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, 1961Biological controlcompetitioninterferencenematodesAmsinckia intermediaTriticum aestivumAnguina amsinckiaeAMSIN
Type
Weed Biology and Ecology
Information
Weed Science , Volume 37 , Issue 6 , November 1989 , pp. 771 - 777
Copyright
Copyright © 1989 by the Weed Science Society of America 

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