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我们从1980年开始对四代三化螟的幼虫与白穗的关系进行了调查,以期探讨是否可以此预测四代的虫口密度,建立相关回归预测式,从而减少工作量,提高准确度。 一、调查时间和方法 待四代三化螟白穗定型以后,于11月上、中旬(收割前10天左右)选有代表性(按白穗的轻、中、重)的双季稻田2至3丘,剥查白穗团的白穗(包括虫伤株、隐害株、死孕穗、健株在内)。分别统计每个白穗团的白穗数(只计白穗,不计其他
Since 1980, we investigated the relationship between the larvae and white spikes of the four generations of the rice stem borer (Chilo suppressalis) in order to explore whether we can predict the population density of the fourth generation and establish the regression prediction formula to reduce the workload and improve the accuracy. First, the investigation time and method to be four generations of white rice after the white rice stem shape, in November, mid (about 10 days before harvest) selected representative (according to white spike light, medium and heavy) double cropping rice fields 2 To 3 mound, white spike white stripe inspection (including insects strains, hidden strains, dead bosom, healthy strains, etc.). Statistics white spike per panicle number (only white spike, excluding all other