稻纵卷叶螟发生与太阳射角关系的初探

Preliminary Inquiry of the Relation of Rice Leaffolder Occurrence with Sun Radiating Angle

经调查研究资料分析，正常的气候情况下，我国东半部稻纵卷叶螟主害代蛾是处于中午太阳光线与地面或坡地斜面成７０～８０度幅射角时出现的。其中上半年是随太阳７０～８０度的射角从南到北出现时，其主害代蛾就从南到北逐代水平迁飞。下半年随大阳７０～７８度射角从北回南出现时，其主害代娥也从北到南逐代水平回迁；高山地区随太阳７０～８０度射角在不同时期、不同海拔高度的出现，稻纵卷叶螟主害代蛾也发生７月上山，８月下山的逐代垂直迁飞过程。利用这一现象，可以制定宏观联合跟踪防治策略和确定防治适期。

Through analyzing the materials of research, we have known the major pestilent generation moths of the Leaf folder (Cnaphalocrocismedlnalis ) are high occurrence, in the east part of China and under the normal conditions of climate almost since sun radiating angle shaped the sunbeam at noon with the horizon or incline is become 70￣80 degrees. In the first of six months,they occur gene ration after generation as level migration aglong with sun radiating angle is become 70￣80 degrees, from south to north In the latter of six months, they occur generation affer generation as leveh migration; along with sun radiatine is become 70￣80 degrees, from south to north.In the high mountain area, they maybe occur the vertical migration process as flying upward along the mountain in July and flying downward in August,sincc sun radiating angle is decome 70￣80 degrees in the differential period and elevation.Make use of the phenomenon, we may work out the tactics of macroscopic combined purauit prevent ion and cotnrol, and define the opportunt moment of prevention and cotnrol.