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47th TWC, Tob. Work. Conf., 2016, abstr. 74

Evaluation of tobacco varieties for resistance to black shank disease in Berrien County

BEASLEY E.; VON WALDNER M.; EDWARDS P.; BERTRAND P.; MOORE J.M.
University of Georgia, Nashville GA USA

Black shank (Phytophthora nicotianae), is a persistent soil-borne disease of tobacco in Georgia. The introduction of tobacco (Nicotiana tabacum L.) varieties with resistance to race 0 of Phytophthora nicotianae has led to an increased population of race 1 in Georgia tobacco fields. With the effect of selective pressure of resistant varieties to race 0, there has ultimately been a need for horizontal resistance, or tolerance, to race 1. The primary purpose of these trials was to evaluate variety CC 143 to other known varieties with relative resistance to black shank. Two variety trials were performed in Berrien County in 2014 and one in 2015. Fungicide recommendations for each field was made according to University of Georgia recommendations and grower preference. Black shank disease ratings were variable over the course of two years. However, in 2014, disease pressure was extremely high. The variety CC 143 was shown to provide consistent and acceptable black shank resistance. Comparisons could be made with numerous other varieties, which showed consistent, statistically similar results. (Reprinted with permission)