水稻孕穗期稻茎毛眼水蝇经济阈值的研究  

Economic Threshold of Hydrellia sasakii at Booting Stage of Rice.

作　　者：秦厚国[1] 叶正襄[1] 李华[1] 罗任华[1] 

机构地区：[1]江西省农业科学院植物保护研究所

出　　处：《植物保护》1997年第6期12-15,共4页Plant Protection

摘　　要：试验表明，水稻孕穗期每丛水稻茎毛眼水蝇卵数（Ｘ１）、被害穗数（Ｘ２）与产量损失（Ｙ）的关系符合下列方程：Ｙ＝－２．０１＋４．５２４Ｘ１±２．２，ｒ＝０．９９１４；Ｙ＝－０．０７６＋４．９１２Ｘ２±２．７８，ｒ＝０．９８６３。产量损失的主导因素是水稻受害后，早稻实粒数减少，晚稻总粒数和实粒数减少。根据防治费用，稻谷价格等，导出孕穗期稻茎毛眼水蝇的经济阈值为每丛禾１．９粒卵或１．３４株受害穗。经大田验证，与实际基本相符。The experiment results indicated that the relationships between the yield loss of rice (Y) and the egg density of Hydrellia sasakii (X 1) and the damaged ear (X 2) at the booting stage of rice fit the following equations:Y=-2 01+4 524 X 1±2 2, r=0 991 4; Y=-0 076+4 912 X 2±2 78, r=0 986 3. The main reasons of rice yield loss were that the fertile grain on early rice and the total grain and fertile grain on late rice were reduced, respectively. According to the present price of rough rice and control cost, the economic thresholds for controlling of Hydrellia sasakii were 1.9 eggs or 1.34 damaged ear per cluster.

关 键 词：水稻 孕穗期 稻茎毛眼水蝇 产量损失 经济阈值 

分 类 号：S435.112[农业科学—农业昆虫与害虫防治]