Csinos A S, Pappu H R, McPherson R M, Stephenson M G
Department of Plant Pathology.
Department of Entomology.
Plant Dis. 2001 Mar;85(3):292-296. doi: 10.1094/PDIS.2001.85.3.292.
Tomato spotted wilt virus (TSWV) continues to be a major production constraint in flue-cured tobacco in Georgia. Pretransplant applications of acibenzolar-S-methyl (Actigard) and imidacloprid (Admire and Provado) were evaluated in field trials, singly and in combination, in four locations in 1999. Acibenzolar-S-methyl was also evaluated for its effect on growth and yield, potential phytotoxicity, and activity against tobacco blackshank incited by Phytophthora parasitica var. nicotianae. Acibenzolar-S-methyl alone and with imidacloprid significantly reduced TSWV incidence in all four locations, but the disease incidence in the imidacloprid-treated plots was lower in only one of the four sites. Applications of acibenzolar-S-methyl starting at 4 weeks posttransplant had no effect on TSWV incidence, size, or yield of tobacco compared with nontreated plots. Acibenzolar-S-methyl did not reduce blackshank in a field trial. In the greenhouse, rates of acibenzolar-S-methyl ranging from 0.25 to 8 g a.i. per 7,000 plants showed reductions in growth that did not seem to be related to rate. Pretransplant applications of acibenzolar-S-methyl were critical to the suppression of TSWV, while initial applications made posttransplant had no effect, suggesting that plants must be protected prior to introduction into the field.
番茄斑萎病毒（TSWV）仍是佐治亚州烤烟生产的主要限制因素。1999年，在四个地点进行了田间试验，对移栽前施用苯并噻二唑 - S - 甲酯（阿泰灵）和吡虫啉（艾美乐和普洛维登）进行了单独及组合评估。还评估了苯并噻二唑 - S - 甲酯对生长和产量的影响、潜在的植物毒性以及对寄生疫霉烟草变种引起的烟草黑胫病的防治活性。单独施用苯并噻二唑 - S - 甲酯以及与吡虫啉组合施用在所有四个地点均显著降低了TSWV发病率，但吡虫啉处理地块的发病率仅在四个地点之一较低。与未处理地块相比，移栽后4周开始施用苯并噻二唑 - S - 甲酯对烟草的TSWV发病率、大小或产量没有影响。在田间试验中，苯并噻二唑 - S - 甲酯没有减轻黑胫病。在温室中，每7000株植物施用0.25至8克有效成分的苯并噻二唑 - S - 甲酯导致生长减缓，且似乎与施用量无关。移栽前施用苯并噻二唑 - S -甲酯对于抑制TSWV至关重要，而移栽后首次施用则没有效果，这表明在将植物引入田间之前必须进行保护。
