论文部分内容阅读
1987～1989年的田间试验表明:小麦灌浆期条锈病的病情指数与产量的相关性最强,发病越重,灌浆速度越慢。但病害对灌浆时间的长短影响不大。盆栽试验证明:旗叶发病对千粒重的影响最大,特别当旗叶、倒二叶的病情严重度达5％以上时,对千粒重影响更为明显。因此认为小麦灌浆期的病情指数为5时,作为条锈病损失的临界病情比较合适,并组建了产量损失预测模型。
The field experiments from 1987 to 1989 showed that the correlation between disease index and yield of wheat stripe rust was the strongest, the incidence was heavier and the grain filling rate was slower. But the disease has little effect on the length of filling time. Pot experiment showed that the incidence of flag leaf had the greatest impact on 1000-grain weight, especially when the severity of flag leaf and second leaf was more than 5%, the effect on 1000-grain weight was more obvious. Therefore, it is considered that the critical condition of stripe rust loss is appropriate and the yield loss prediction model is established when the disease index at wheat filling stage is 5.