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COMPARISON OF SUSCEPTIBILITY TO TOMATO SPOTTED WILT VIRUS IN PVH 2310 AND NC 196 VARIETIES OF TOBACCO

Applied Research

Kimberly Post
County Extension Agent
University of Georgia
Lakeland

Abstract

The leading tobacco disease in Georgia is spotted wilt caused by Tomato spotted wilt virus. Previous research has shown there is no difference in resistance to Tomato spotted wilt virus (TSWV) between common varieties of tobacco. No source of resistance has been identified or incorporated into commercial tobacco. However, trials conducted in 2018 and 2019 suggested that PVH 2310 may be more susceptible to TSWV than other popular varieties such as NC 196. PVH 2310 is often selected to utilize barn space more efficiently due to its early maturity and competitive yields. Thus, determining whether PVH 2310 exhibits higher incidence of TSWV compared to another common variety does have value to tobacco growers in South Georgia. Treated and untreated PVH 2310 plants were compared to treated and untreated NC 196 plants. Treatment consisted of Actigard® 50WG and AdmirePro® on separate occasions. Six trials sites were transplanted and visually evaluated for spotted wilt at two-intervals. The untreated PVH 2310 had the highest mean percent of spotted wilt across all trials (23.0%), followed by untreated NC 196 (15.8%), treated PVH 2310 (14.7%), and treated NC 196 (10.5%). The final mean percent of spotted wilt in untreated PVH 2310 was significantly different from the other treatments. The data indicates that PVH 2310 is more susceptible to TSWV than NC 196, regardless of whether it was treated or untreated. Growers should be aware of this when choosing PVH 2310 as an early-maturing variety to fill barns, and decide whether it is worth the risk. Breeders should also be aware that increased susceptibility to TSWV does exist and take this into account in planning crosses.

Poster has NOT been presented at any previous NACAA AM/PIC

This poster is being submitted for judging. It will be displayed at the AM/PIC if not selected as a State winner. The abstract will be published in the proceedings.

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Authors: K. K. Post, B. Reeves, T. Barnes, J. McLemore, P. Bertrand, J.M. Moore
  1. Post, K. County Extension Agent, University of Georgia, Georgia, 31635
  2. Reeves, B. County Extension Agent, University of Georgia, Georgia, 31639
  3. Barnes, T. County Extension Agent, University of Georgia, Georgia, 31642
  4. McLemore, J. County Extension Agent (former), University of Georgia, Georgia, 31533
  5. Bertrand, P. Plant Pathologist - Retired, University of Georgia, Georgia, 31793
  6. Moore, J. Extension Agronomist - Tobacco, University of Georgia, Georgia, 31793