黑龙江春小麦根腐病危害损失研究

LOSS OF SPRING WHEAT CAUSED BY WHEAT ROOT ROT IN HEILONGJIANG PROVINCE

通过田间小区控制试验和大田中取样调查等方法,对小麦根腐病在小麦生长不同阶段的危害损失进行了较详细的研究,明确了小麦根腐病苗腐主要影响田间保苗率、幼苗长势及成穗率等而造成产量损失;成株期的叶腐、穗腐则主要影响粒重而造成大幅度减产;同时穗腐又造成小麦籽粒感病,使种子质量下降而带来损失。

The loss of spring wheat caused by the wheat root rot (Bipolaris sorokiniana Shoem.) was assessed in field experiments. The experimental results showed that the emergence and growth of seedling was mainly injuried by the disease at seedling stage. The percen tage of seedling and earbearing tiller was decreased when the disease occured at seedling stage. The grain weight of wheat was greatly reduced by the disease that caused leaf necrotic spot and headblight of wheat at the plant growing and riping stage. Diseased grains were increased by the headblight, which led to a loss in seed quality.