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烂秧是水稻秧田幼苗腐烂死亡的总称。据我们1966—1980年的断续调查,发病轻重因气候条件而异。1974年寻甸县大河桥烂秧损失率达42.3％,其中因水稻绵腐病菌造成的损失率占36.8％,致使缺秧重播,因而,延误了节令,浪费了种子。防治烂秧、保证适时栽秧是促进增产的一个重要环节。一、症状与病因根据多年来的断续调查,将各种类型的症状和病因列表如下。二、病因分析 (一) 低温:水稻原为喜温植物,发芽初期生长的最低温度为12℃。低于此温度,就直接影响幼苗的生理生化活动,抑制生长,因而抗逆性减弱,易受其他不利因素为害。如冻害、绵腐等病的发生都与低温有关。
Rotten seedling is the general term for rotting death of rice seedling seedlings. According to our intermittent investigation from 1966 to 1980, the severity of the illness varies according to the climatic conditions. In 1974, Xundian County Daheqiao rotten seedling loss rate reached 42.3%, of which the loss of rice caused by Toxoplasma gondii accounted for 36.8% of the loss, resulting in replay replanting, thus, delayed the order, wasting seeds. Control rotten seedlings, to ensure timely planting is an important part of promoting yield. First, the symptoms and causes According to years of intermittent investigation, the various types of symptoms and causes list below. Second, the etiology (a) low temperature: The original rice plants are thermophilic, the minimum temperature of the initial germination of 12 ℃. Below this temperature, it directly affects the physiological and biochemical activities of seedlings, inhibition of growth, so weakened resistance, vulnerability to other adverse factors. Such as frost damage, cotton rot and other diseases are associated with low temperature.