3.Behavior *During the female ear period,most younger larvae in male flowers bore into the stem at its points of connection with female ears and into its upper and lower stem segments.This damage severely influences plant nutrient transportation and female ear growth,even causing stems to break.A stem break below the female ears can cause a severe reduction of plant harvest. 玉米抽丝时，原在雄穗上一些较小的幼虫，大多自雌穗节及上下 茎节蛀入，严重破坏养分输送和影响雌穗的发育，甚至遇风造成折茎 而减产，尤以穗下折茎影响产量最重。 ™During the female ear period, most younger larvae in male flowers bore into the stem at its points of connection with female ears and into its upper and lower stem segments. This damage severely influences plant nutrient transportation and female ear growth, even causing stems to break. A stem break below the female ears can cause a severe reduction of plant harvest. 玉米抽丝时，原在雄穗上一些较小的幼虫，大多自雌穗节及上下 茎节蛀入，严重破坏养分输送和影响雌穗的发育，甚至遇风造成折茎 而减产，尤以穗下折茎影响产量最重。 3. Behavior 3. Behavior