Influence of temperature and light on severity of bacterial blight of corn zea mays cultivar pioneer 3030 oats avena sativa cultivar georgia 7199 and wheat triticum vulgare cultivar mcnair 1587

Schaad, N.W.; Sumner, D.R.; Ware, G.O.

Plant Disease 64(5): 481-483


ISSN/ISBN: 0191-2917
Accession: 005693129

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Two experiments using 5 strains of Pseudomonas avenae and 5 day/night temperature regimens were conducted to determine the influence of temperature and light on the severity of bacterial leaf blight of corn, wheat and oats. The first experiment showed that light had no effect on lesion development. In the second experiment, plant growth data for corn and wheat were recorded also. The effects of temperature on blight severity differed with the host. On corn, lesion development was not affected by temperature but plant growth was significantly reduced at the three intermediate temperature regimens. Average lesion size was significantly greater with strain C-71 than with strain 19860 at temperatures of 22/14 and 18/ C but not at 30/26, 30/22, or 22/ C. On oats, P. avenae strain significantly affected lesion development and disease was generally more severe at highter temperatures. On wheat, blight symptoms were generally more severe at higher temperatures but P. avenae strain had no significant effect. Under Georgia conditions, bacterial blight should be less severe in oats and wheat sown late in the fall season when the temperature is cooler. With corn, plant growth should be less reduced when the mean evening temperature is .gtoreq. 22 C. Strains of P. avenae should affect the severity of bacterial leaf blight of corn and oats but not of wheat.