| 摘要: |
| 对桉树枝瘿姬小蜂的鉴别特征和危害症状进行描述。测定结果桉树枝瘿姬小蜂种群为聚集分布、空间分布型为负二项分布，在树干和侧枝上的种群聚集度大于叶片，树干和侧枝上的种群扩散系数C、负二项分布k值、扩散指数I§、平均拥挤度m*、L指数（个体群的平均大小）分别为46.2065、0.2811、3.5294、57.9134和58.9111，叶片上则分别为7.0401、0.9949、1.9996、9.0574和7.0500。虫瘿平均长度0.32cm、平均宽度0.22cm、平均大小0.0901cm2。虫瘿数量和羽化孔数量主要分布在树冠枝条的上层；不同无性系桉树上的虫瘿数量在不同部位上存在差异，广林9主要危害枝条、巨桉主要危害叶片；在叶片的虫瘿数量差异上，广林9主要危害叶柄，巨桉则同时危害叶柄和叶脉；已发现桉树枝瘿姬小蜂的天敌寄生蜂—长尾金小蜂Zeala sp.。 |
| 关键词: 桉树枝瘿姬小蜂 鉴别特征 种群发生规律 空间分布格局 |
| DOI： |
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| Study on the Population Happen Rule and Spatial Distribution Pattern of Leptocybe invasa at Eucabyptus |
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Xu Jiaxiong
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| Abstract: |
| The paper studied the population regularity and the spatial distribution pattern of Leptocybe invasa on Eucabyptus. All indices indicated that its distribution was a negative binominal distribution of an aggregated pattern. The population density is higher in limb and lateral branches than in leaves. C, k, I, m* and L is respective 46.2065, 0.2811, 3.5294, 57.9134 and 58.9111 in limb and lateral branches, 7.0401, 0.9949, 1.9996, 9.0574 and 7.0500 in leaves. The average length of gall is 0.32 cm, the average width is 0.22 cm, the average area is 0.0901 cm2. The galls and the holes of eclosion of the pests mainly concentrated on the top of the plants, but the number of galls varies on different sites in different type of Eucabyptus, for Guanglin 9 type the pests mainly damaged the branches, for Large Leaves type the pests mainly damaged the young foliages. From the number of the galls, the pests mainly damaged the petiole of Guanglin 9 type, simultaneity damaged the petiole and the midrib of Large Leaves type. The characteristics of Leptocybe invasa and the damage symptom on Eucabyptus were described, and a natural parasitoid enemy Zeala sp. was found. |
| Key words: Leptocybe invasa,differentiate characteristic,population happen rule,spatial distribution pattern |
