椰心叶甲的天敌——椰心叶甲啮小蜂在田间扩散距离测定

The Dispersal Distance Test of Tetrastichus brontispae in the Field, a Natural Enemy of Coconut Leaf Beetle,Brontispa longissima

采用软皮尺实地丈量,使用OP3000水准仪测量和使用地球定位仪———Gps72测定椰心叶甲的天敌———椰心叶甲啮小蜂在田间释放后的扩散距离及向上扩散的高度。结果表明:椰心叶甲啮小蜂在田间有一定的向周边扩散能力,在田间释放后20d,啮小蜂可向周边扩散10~50m。7个月后,最远可扩散6 km。扩散距离与风向有关,东北风较多情况下,向西南扩散最远距离可达6060 m,向东北方向扩散仅仅890 m。啮小蜂在田间扩散呈椭圆形状向各方向扩散,顺风面扩散距离远、范围较大。

The soft tape measure,water level gauge OP3000 and the Global Position System-Gps72 were used to test the dispersal distance and the dispersal height of the natural enemies,Tetrastichus brontispae Fer.After releasing in the field,the result indicated that,T.brontispae had the certain diffusive ability in the field.After 20 d in the field releasing,T.brontispae can diffuse 10-50 m around.After 7 months,the furthest dispersal distance was 6 km.The dispersal distance had relationship with orientation of the wi...