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穗颈稻瘟病(以下简称穗颈瘟)常年在我县仅零星发生;但1975年却暴发成灾。无论山区、丘陵、岗地、河畈都有此病发生,以城郊、浙河、安居、厉山、均川、环潭、洪山等肥水条件较好的社、队发病面积大、受害重。全县早稻面积49.7万亩,发病的就有34,200亩。早稻受害后,穗颈节黑褐色枯死,谷穗枯黄灰白。发病迟的,秕谷增多,米质松碎,千粒重低,一般减产13—39％;发病早的造成白穗、半白穗,减产52％以上;发病特别严重的则颗粒无收。一般出米率只有48—56％。如厉山公社友谊一队19.5亩“先锋1号”,受害前呈千斤长相,受害
Panicle blast (hereinafter referred to as panicle blast) perennial in our county only sporadic; but in 1975 it was an outbreak. No matter in mountainous areas, hills, hillocks, or river crabs, the disease occurred. Suburban, Zhehe, Habitat, Lieshan, Junchuan, Central Lake, Hongshan and other fertilizer and water conditions were better. The county area of 49.7 mu of early rice, the incidence of 34,200 mu. After the damage of early rice, panicle neck dark brown dead, yellowish brownish white ears. Incidence of late, increase the valley, the quality of rice is broken, the grain weight is low, the general reduction of 13-39%; early onset caused white spike, half white spike, cut more than 52%; the incidence of particularly serious particles without income. General rate of rice is only 48-56%. For example, a 19.5-hectare “Pioneer No.1” friendship team of Liushan Commune was severely damaged before the victimization