Factors influencing occurrence of sheath blight disease in tobacco
Journal Title: 广东农业科学 - Year 2018, Vol 45, Issue 1
Abstract
In order to clarify epidemic dynamics of sheath blight disease and its influencing factors in field， the occurrence of the disease and population of Rhizoctonia solani in soil were systematically investigated in 2015， and the impact of meteorological factors and total number of bacteria in soils were analyzed using SAS software. Meanwhile，the resistance of 14 tobacco cultivars to sheath blight disease was tested. The results showed that the first signs of disease appear at the resettling growth stage during harvest，the disease spread rapidly at the topping stage，reaching its peak on pick period. Weekly average relative humidity（ x4） and pathogen quantity in soil（ x7） were closely related with disease index（ y），with regression equation y = 0.02018x4 + 0.03945x4 - 1.0054 （R2 = 0.994）. Fourteen tobacco cultivars had different levels of disease resistance to the disease. Among them， Yunyan 97，Honghuadajingyuan，Yunyan 87 and Yunyan 100 were resistant cultivars，Yunyan 203 and Anyan No.2 were moderate susceptible and susceptible ones，respectively，while the remaining cultivars were categorized as moderately resistant ones.
Authors and Affiliations
Xing HUO, Gao-qing YUAN
Keywords
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- EP ID EP590804
- DOI 10.16768/j.issn.1004-874X.2018.01.012
- Views 121
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