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1981—1983年我们对稻纵卷叶螟为害损失及防治指标进行了研究。对主要稻种采用盆栽接虫及田间小区接虫试验,所得资料经统计分析,找出不同虫口密度与为害叶率和产量损失间的关系。在此基础上制定了不同虫口密度与为害叶率和产量损失检索表。以防治费用作为依据,不同稻种生产水平下的经济允许损失率一般为1.2—3.3％。经综合分析提出的防治指标:水稻分蘖期为百蔸40—60头,孕穗期为百蔸20—40头;被害叶率分蘖期可控制在7—9％,孕穗期可控制在3—5％。其为害损失均可控制在12斤稻谷左右。此防治指标经大田初步验证较为符合实际。
From 1981 to 1983, we studied the damage and control of rice leaf roller. Pot experiments were conducted on the main rice varieties using potted insects and field plots. Statistical analysis was conducted on the data obtained to find out the relationship between different insect population densities and leaf damage rate and yield loss. On this basis, different insect population density and damage leaf rate and yield loss retrieval table. Based on the cost of prevention and control, the economic allowable loss rate under different rice production levels is generally 1.2-3.3%. According to the comprehensive analysis, the prevention and control indexes are as follows: the tillering stage of rice is 40-60 and the booting stage is 100-40; the rate of the diseased leaves and tillering stage can be controlled at 7-9% and the booting stage can be controlled at 3-5 %. Its damage can be controlled at about 12 pounds of rice. This prevention and control index was verified by the field more in line with the actual.