桉树枝瘿姬小蜂种群动态研究

The Population Dynamics of Leptocybe invasa Fisher & La Salle on Eucalyptus spp.

桉树枝瘿姬小蜂（Leptocybe invasa Fisher ＆ La Salle）是2000年发现的一种专一危害桉属植物的害虫。本文从生态学角度．对海南岛8个气候区内桉树枝瘿姬小蜂数量在3种品（系）桉树上的消长动态进行了12个月的观察．以期为防治桉树枝瘿姬小蜂在海南大规模爆发提供理论依据。研究结果表明：桉树枝瘿姬小蜂在3种品（种）系桉树上的虫害爆发期均为每年3．10月。通过全年数据对比，尾赤桉与窿缘桉上的桉树枝瘿姬小蜂虫口密度较高．尾巨桉的较低（p〈0．01）。海南岛内各气候分区虫口密度存在显著性差异，其中西北部沿海气候区、西南部山区气候区、西南部沿海气候区内的3种品（系）桉树上桉树枝瘿姬小蜂虫口密度相比岛内其它5个气候区更高（p〈0．05）。

Leptocybe invasa Fisher ＆ La Salle is a insect pest newly found in 2000 specifically damage Eucalyptus species. The population dynamics of the adult number of the insect on three varieties of Eucalyptus species （E. urophyllaxE, camadulensi, E. grandisxE, urophylla, E. emserta） in eight climate regions in Hainan Island during August 2011 to July 2012 were studied ecologically. The results showed that, among the three Eucalyptus species, the population density on E. urophyllaxE, camadulensi and E. emserta were higher than that on E. grandisxE, urophylla （p〈0.01）. The outbreak period was from March to October. The population density on the three varieties of Eucalyptus species in the southwest mountain climatic region, the southwest coastal climatic region and northeast climatic region were higher than that in the other five climatic regions in Hainan Island （p〈0.05）.