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Aphanomyces euteiches Drechsler can cause severe root rot in peas. Previous research has identifi ed two bacterial isolates, Bacillus subtilis LU1241 and Paenibacillus polymyxa LU1133, able to suppress aphanomyces root rot of peas. If these bacteria are to be used as biological control agents in the fi eld, it is important to know whether their effi cacy is affected by commonly used pesticides. An assay was developed to determine the effect of selected fungicides, insecticides and herbicides on populations (colony forming units) of the two potential biological control agents. None of the fungicides (cyproconazole, metalaxyl-M, azoxystrobin and sulphur) inhibited growth of P. polymyxa and all stimulated growth of B. subtilis compared with the non-fungicide control. The herbicides sethoxydim and bentazone had no effect on either bacterium and diquat signifi cantly inhibited growth of B. subtilis but had no effect on P. polymyxa. The insecticides pirimicarb, lambda-cyhalothrin and diazinon had no effect on B. subtilis. Pirimicarb had no effect on P. polymyxa, but abnormal colony morphology with spreading growth was observed for both diazinon and lambda-cyhalothrin. Different sensitivity to the pesticides was observed with each bacteria species and this could infl uence the use of the biological control agents in a fi eld environment.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Pesticide compatibility of bacterial biological control agents with the potential to control aphanomyces root rot in peas