论文部分内容阅读
为了揭示褐飞虱种群数量灾变规律,提高监测预警水平,2012年对单季稻甬优9号露地栽培与笼罩栽培处理的褐飞虱种群数量消长与为害进行了系统监测。结果表明,无论在露地状态,还是田间笼罩状态下,褐飞虱种群数量增长拐点均出现在水稻拔节期(8月中旬)至孕穗期(8月底至9月初),然后种群数量快速上升,直至9月底水稻乳熟期达种群数量高峰,致使田间陆续出现冒穿、倒伏灾变。经统计分析,单季稻拔节期褐飞虱虫量(m2)、孕穗期褐飞虱虫量(m3)与产量损失率(y)关系模型分别为y1=2.840 9m2-18.940 1和y2=1.249 8m3-11.0669。故在单季稻区对褐飞虱的灾变预警应以8月中旬和9月上旬的虫口密度为主要指标,即一般虫量达到7～10头/丛时就应发布预警。
In order to reveal the rule of catastrophe of BPH population and improve the level of monitoring and warning, the population growth and damage of Nilaparvata lugens (Nilaparvata lugens), a single cropping rice, Yongyou 9, in 2012 were systematically monitored. The results showed that the inflection point of population growth of BPH population appeared at the jointing stage (middle August) to booting stage (from the end of August to the beginning of September), both in open field and in the field, and then the population increased rapidly until the end of September The peak of rice population reached the peak of population, resulting in one after another field to run through, fall disaster. According to statistical analysis, the relationship between the number of brown planthopper (m2) at the jointing stage and the rate of yield loss (ym) at the booting stage was y1 = 2.840 9m2-18.9401 and y2 = 1.249 8m3-11.0669 respectively. Therefore, early warning of brown planthopper catastrophe in single cropping area should be based on the density of insects in mid-August and early September, that is, early warning should be issued when the average number of insects reaches 7-10 plexuses.