摘要
采用多点试验方法，对稻蝗若虫集中田边为害期导致的水稻产量损失进行测定。结果表明：若虫虫量与产量损失呈正相关（ｒ＝０．９３５３），损失率回归方程ｙ＝１．２９４７＋５．５７２３ｘ。应用经济效益指标代替目前沿用的经济阈值指标，在生产水平５５０ｋｇ／６６７ｍ２，６月上旬稻田边２ｍ范围内化学防治的虫量指标为３１０头／百丛，较原指标６１头／百丛放宽５倍。
Loss of rice produce was measured by the methods of multiple point experiment during the intensive attacking period of rice nymphae near the boundary strip. Result showed that the relationship between the loss of rice produce and the population of rice nymphae was positive correlative( r=0.9353), the regression equation of loss rate was: y=1.2947+5.5723x . According to economic effect index which has replaced the former economic threshold, at the rice production level of 550kg/667m2, within the boundary strip of 2m, during the first ten days of June, the population index of 310 colony per hundred clump for chemical control, is four times more than former's, 61 colony per hundred clump.
出处
《植保技术与推广》
1999年第3期11-13,共3页
Plant Protection Technology and Extension
