小麦叶锈病(Puccinia recondita)所致产量损失的研究

RESEARCH ON THE YIELD LOSS OF WHEAT CAUSED BY PUCCINIA R ECONDITA

通过人工接种,在田间造成小麦叶锈病(puccinia recondita.Rob.ex Desm.f.sp,tritici)流行动态不同的小区。系统调查各小区病情及单收计产,经过回归分析,建立和选用了比较满意的产量损失预测多点模型 YL=-0.5356+2.1385x_6+0.3182x,式中 x_5为灌浆初期病情指数,x_7为灌浆盛期病情指数。

Different cases of epidemic of Puccinia recondita were created by artificial inoculation in the field.The percentage rates of yield loss were got by comparing the yields of the diseased plots with the pairing check plots.By stepwise regression,CP-model,MP-model, and AUDPC-model were derived.The MP-model,YL=-0.6356+2.13852 X6 +0.3183 X7(X5—disease index at flowing over,X7—disease ind- ex at mealy ripe;r=0.83,SD=5.64,n=44),was chosen to estimate the yield loss of wheat caused by Puccinia recondita. It is demonstrated by comparing the simulated results of the MP- model and that from the prediction equation developed by the Institute of Plant Protection of Shandong Province that the rates of yield loss (%) between two cultivars seemed to be a stable value.