小麦条锈病产量损失及防治指标研究

Study on the Relationship between Yield Loss and Wheat Stripe Rust and Its Control Index

试验在小麦自然生长条件下,研究了小麦条锈病病叶率、剑叶严重度与小麦产量损失及其防治指标。结果表明,小麦产量损失率(y)与条锈病病叶率分级值(x)的回归方程为y=2.36x,相关系数r为0.9873**;与严重度分级值(x)的回归方程为y=5.79x,相关系数r为0.9886**。小麦条锈病的防治指标是病叶率为2%或剑叶严重度为1%。

The results from studying the relationship between yield loss and leaf disease rate of wheat stripe rust, disease severity of flag leaf under the field condition showed that y（yield loss）= 2.36x1 （leaf disease rate） and y（yield loss）= 5.79x2 （disease severity of flag leaf）, and the correlated coefficient was 0. 9873＊＊ and 0. 9886＊＊ respectively. When leaf disease rate is 2% or disease severity of flag leaf is 1 %, the control measure should be applied in wheat fields.