小麦条锈病产量损失估计

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。

Estimation of Wheat Yield Losses Caused by Stripe Rust

Experiments conducted in the years of 1987-1989 indicated that the correlation between wheat yields and disease index of stripe rust in the filling stage is the most significant, and that the more serious the disease is, the slower is the speed of filling of wheat, but the disease has no impact on the length of filling time or duration. Pot experiments proved that flag leaves infected with stripe rust has a great impact upon 1000 grain weight, particularly when the disease severisy of flag leaves and the second leaf infected with stripe rust reached over 5%, 1000 grain weight was seriously affected. Therefore, the author held that when disease index was over 5 in the filling stage, this should be taken as the critical disease index for the losses caused by wheat stripe rust, and the predicting model of yield losses was established as well.