Phytopathology (1996) 86, p. S52 (Yuen et al.)

G.Y. Yuen and M.L. Craig (1996)
Independent effects of temperature on antagonism against Sclerotinia sclerotiorum and colonization of common bean by Pantoea agglomerans strains
Phytopathology 86 (11 suppl.), S52-S52
Abstract: Pantoea agglomerans (= Erwinia herbicola) strains isolated from common bean blossoms were screened for inhibition of white mold, caused by Sclerotinia sclerotiorum, on bean blossoms at low temperatures (<20 C) often found in bean canopies. "Low temperature" strains (e.g. 13409) inhibited the disease at 16 and 25 C, whereas "high temperature" strains (e.g. B346) were effective only at 25 C. B409 and B346 multiplied on blossoms at the same rate regardless of temperature suggesting that the more effective disease inhibition by strain B409 at 16 C as compared to B346 was related to differential expression of mechanism(s) of antagonism rather than to differential growth rate. No differences between B409 and B346 in white mold biocontrol efficacy were observed when they were applied to bean plants in the field. The bacteria colonized bean leaves and blossoms to the same extent, with the percentage of blossoms colonized by each declining during the 4-week blossoming period. Thus, environmental factors, such as temperature, can affect colonization and antagonism independently, and the selection of biocontrol strains with field efficacy must consider both processes.
Database assignments for author(s): Gary Y. Yuen

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
environment/habitat manipulation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Sclerotinia sclerotiorum	Beans (Phaseolus)
Pantoea agglomerans (antagonist)	Sclerotinia sclerotiorum	Beans (Phaseolus)