麦圆蜘蛛在麦株上的转移习性观察

Observation of transfer habits of Penthaleus major on wheat plants

麦圆蜘蛛Penthaleus major(Duges)在小麦上的危害有明显加重的趋势,田间种群密度的调查仍是目前虫情测报的主要手段。为了解麦圆蜘蛛在麦株上的转移习性,以便为其田间调查取样和防治提供参考,作者于2008年进行3部分田间观察。结果表明:麦圆蜘蛛在小麦植株上具有较强的活动性,可随田间环境条件的不同而改变其栖息场所。在同一观察日内,其在麦株上的虫量多表现早晚时段多于中午时段;在有风、阴雨和气温相对较高时,麦株上的虫量分布均有明显下降的趋势。麦圆蜘蛛主要分布于麦株由上向下数第3～4叶位上;在不同叶位上的虫量,多以叶片反面相对最多,其次为叶鞘和叶片正面。

The damage of Penthaleus major （Duges） to wheat showed significantly increasing trend. At present,the investigation of field population density was still primary method for monitoring and forecast. In order to understand the transfer habits of P. major on wheat plants,the field observation was carried out in 2008. The results showed that P. major had stronger mobility on wheat plants,by which it may change its habitat with the variation of environmental conditions. In the same day,the population density of P. major in the morning and evening was higher than that at noon. It decreased obviously on windy,rainy days and those with high temperature. The amount of P. major was the highest on the third to the fourth leaf position from top to bottom on wheat plants. P. major was distributed mostly on the back of leaves,and next on vaginas and the front of leaves.