HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Harville, B. G. Articles by Habetz, R. J. Search for Related Content PubMed Articles by Harville, B. G. Articles by Habetz, R. J. Agricola Articles by Harville, B. G. Articles by Habetz, R. J.

Rhizoctonia Foliar Blight Reactions and Seed Yields in Soybean

Dep. of Agronomy
Dep. of Plant Pathology and Crop Physiology, Louisiana State Univ. Agric. Center, Baton Rouge, LA 70803
Rice Res. Stn., Louisiana State Univ. Agric. Center, Crowley, LA 70527

^* Corresponding author.

Rhizoctonia foliar blight (RFB) is caused by the fungus Rhizoctonia solani Kühn anastomosis group 1, intraspecific groups IA and IB. The disease affects more than half of the soybean [Glycine max (L.) Merr.] acreage in Louisiana. Although less-susceptible cultivars are recommended, reliable estimates of cultivar susceptibility have been difficult to obtain because of several factors, including uneven distribution of RFB in fields, differences in plant developmental stage at time of infection, and the requirement for free moisture in RFD development. The objective of this study was to screen commercial soybean cultivars grown throughout the southern USA, as well as advanced breeding genotypes, for field reaction to RFB in south Louisiana. Ninety-one soybean genotypes, representing Maturity Groups IV, V, VI, and VII, were evaluated at two locations in 1993 and 1994. Disease ratings were made with a severity scale that included pods as well as foliage. A range of reactions to RFB was observed among cultivars, but most were severely damaged. Significant negative correlations between RFB severity and yield occurred among cultivars in all Maturity Groups. Results identified several cultivars, notably Buckshot 66 and Pioneer variety 9593, with promising levels of resistance.

Received for publication April 24, 1995.