48th TWC, Tob. Work. Conf., 2018, abstr. 41

Search for varieties with useful resistance to Black Shank under Georgia growing conditions

SHEALEY J.(1); DAWSON J.(1); TAYLOR J.(1); BEASLEY E.(1); BARNES T.(1); ANDERSON H.H.(1); VON WALDNER D.M.(1); MOORE J.M.(1); BERTRAND P.F.(1); LEWIS R.S.(2)
(1) University of Georgia, Statenville GA USA; (2) North Carolina State University, Raleigh NC USA

As new varieties of black shank resistant tobacco are brought to the market extension agents in Georgia annually conduct variety trials across the state to measure performance and Florida 301 resistance levels throughout our tobacco producing region. It is known that under high enough disease pressure an variety containing FL-301 can fail. In 1995 the first good Php gene variety was released in NC 71 but by 2001 studies already begin to show that the Php gene was beginning to collapses. This presentation shows the results of these trials over the past three years evaluating varieties with High levels of FL-301 resistance. K 326 was used as a standard for the trials in all three years with varieties only moving forward from year to year if they rated better than 50 percent control of black shank when compared to K 326. Plots where rated visually every two weeks beginning after transplant. CC 1063, K 346 CC 143, NC 983 and GL935 all showed greater than 50 percent control compared to K 326. In 2017 trials, NC 1226 which is a not yet released variety showed great promise in black shank management being statistically better than all other varieties in the trial. These results can be attributed to NC 1226’s high level of FL-301 resistance, the Php gene and the Wz genes. (Reprinted with permission)