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近年来，随着徐州市草莓栽培面积的扩大，草莓根腐病的发生蔓延逐渐加重，常引起大面积死苗。一般田块死株率达２０％～３０％，发病重的可达５０％以上，造成毁灭性损失。严重制约着本市草莓生产的进一步发展。现将其发生及综合防治技术论述如下。１症状草莓根腐病主要为害根?
In recent years, with the expansion of strawberry cultivation area in Xuzhou, the occurrence of strawberry root rot has gradually increased, often causing large area dead seedlings. Mortality rate of general fields of 20% to 30%, the incidence of up to 50% or more, resulting in devastating damage. Seriously restricting the further development of strawberry production in this city. Now its occurrence and comprehensive prevention and treatment technology is as follows. 1 symptoms of strawberry root rot mainly harm root?