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2a的试验调查表明,杂交水稻穗期三化螟的侵入以穗茎部和倒一节为主,穗部以下各节也可侵入;三化螟有转移为害习性;在大发生年,杂交水稻穗期三化螟必须防治两次,第一次防治适期应以卵孵始盛至卵孵高峰期为宜,间隔5～7d后防治第二次。
2a experimental investigation showed that the invasion of three rice stems at the heading stage of hybrid rice with spike stem and inverted one is the main section below the ear can also invade the stem borer have the transfer of habit; in the year of occurrence, hybrid rice Spike borer must control two times, the first control should be hatched egg hatch peak to oviposit peak is appropriate, interval 5 ~ 7d after the second control.