Csinos A S
Professor, Department of Plant Pathology, University of Georgia Coastal Plain Experiment Station, Tifton 31793-0748.
Plant Dis. 1999 Aug;83(8):777-780. doi: 10.1094/PDIS.1999.83.8.777.
Stem lesion development in the absence of root decay in tobacco black shank caused by Phytophthora parasitica var. nicotianae has become common in the Coastal Plain tobacco growing area in Georgia. All aboveground symptoms of wilting, blackening of lower stem, and destruction of the pith can occur on tobacco without or with minor root decay. This type of black shank disease development occurred in 14 of 15 locations evaluated and accounted for about 30% of diseased plants. Cultivars with Florida 301-derived resistance had very low stem resistance to race 0 of the pathogen. However, root inoculations of these cultivars resulted in disease reactions typical of those expected in vivo in Georgia. Cultivars Coker 371-Gold and NC 71 and the breeding line 1071 demonstrated high resistance to inoculation with race 0 of P. parasitica var. nicotianae in both the stem and the roots, but they were susceptible when stem-inoculated with race 1 of the pathogen. Severity of root decay was isolate dependent.
由寄生疫霉烟草变种引起的烟草黑胫病中，在没有根腐的情况下茎部病斑的发展在佐治亚州沿海平原烟草种植区已变得很常见。在没有根腐或只有轻微根腐的烟草上，会出现所有地上部萎蔫、下部茎变黑以及髓部被破坏的症状。在评估的15个地点中，有14个出现了这种类型的黑胫病发展情况，约占患病植株的30%。具有源自佛罗里达301抗性的品种对病原菌0号生理小种的茎抗性非常低。然而，对这些品种进行根部接种会产生佐治亚州体内预期的典型病害反应。品种Coker 371 - Gold和NC 71以及育种系1071对寄生疫霉烟草变种0号生理小种的茎部和根部接种均表现出高抗性，但当用病原菌1号生理小种进行茎部接种时，它们易感。根腐的严重程度取决于分离物。
