温度和保湿时间对烟草赤星病叶斑扩展的影响

在人工气候箱内控制条件下研究测定烟草赤星病叶斑扩展规律,结果表明,温度(T)和保湿时间(H)是影响赤星病叶斑扩展的2个主要因素。在温度恒定的条件下,保湿时间延长赤星病病斑面积增大,病斑面积增长一般可持续60h。在12～40℃的温度范围内,烟草赤星病叶斑均可扩展,在同一保湿时间内,12～36℃的温度范围内,随温度升高,病斑扩展率(IP)增大,36℃以后则开始下降。2个品种的病斑面积扩展百分率与温度、保湿时间及其互作具有线性关系NC89SQRT(SQRT(IP))=0.4971-0.00003128×T2×H+0.006659×T×H-0.00006694×T×H2;中烟99SQRT(IP)=0.08099+0.02003×T×H-0.0001078×T×H2-0.002005×H2

Influence of temperature and moisture time on lesion area expansion of tobacco brown spot caused by Alternaria alternata

The lesion area expansion tendency of tobacco brown spot caused by Alternaria alternata was analyzed at control condition in climatic chamber, the results showed that temperature and moisture time are 2 major facts for lesion area expansion . At constant temperature lesion area marked expanded with moisture time up to 60 h. At 12～40℃ the lesion area can be expansion , and increased percentage of lesion area increased with increased temperature up to about 36℃, and then declined. The liner relation was among lesion area increased percentage of two cultivars and temperature, moisture time. The lesion area increased percentage model of two cultivars follows: NC89:SQRT(SQRT(IP))=0.4971-0.00003128×T2×H+0.006659×T×H0.00006694×T×H2; Zhongyan 99:SQRT(IP)=0.08099+0.02003×T×H-0.0001078×T×H2-0.002005×H2 in which T is temperature, H is moisture time, IP is lesion area increased rate(%).