小麦根腐病产量损失及经济阈值研究

Study on the losses of wheat yield and the ELT to wheat root rot

自然发病田中 ,病级与穗粒数下降率、千粒重下降率均呈显著正相关。田间土壤接种试验表明 ,同一品种在相同气候条件下 ,土壤带菌量是小麦根腐病发生和危害程度的关键因素 ;腊熟期小麦根腐病病情指数与产量损失率显著正相关 (r=0 .972 5 * ,n=4)。拌种防治小麦根腐病 ,防治指标为当地近年主栽品种上的病情指数。

Under the natural condition, the disease severity scale has significantly positive correlation to the reduced rate of the ear grains and 1 000 kernels weight.The result of inoculated soil trail showed that damage degree of Bipolaris Sorokinianum (Sacc.)Shoemader on a same variety and climate is mainly influenced by the amount of fungus in soil.The relativity between the disease indes in mature period and the loss is significant positivity (r=0.972 5 *,n=4).Seed dressing is used for controlling Wheat BSS,ELT is basied on disease index of varieties at local area in recent years.