Parasitoid complex of diamondback moth in south-east Queensland: first records of Oomyzus sokolowskii (Hymenoptera : Eulophidae) in Australia
Parasitoid complex of diamondback moth in south-east Queensland: first records of Oomyzus sokolowskii (Hymenoptera : Eulophidae) in Australia
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DOI：
10.1111/j.1440-6055.2007.00572.x
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发表时间：
2007-05
影响因子：
--
通讯作者：
M. Furlong;M. Zalucki
中科院分区：
文献类型：
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作者：
M. Furlong;M. Zalucki
1999-2002年在昆士兰东南部洛克耶河谷的油菜农业生态系统中，对小菜蛾幼虫和幼虫的寄生寄生蜂进行了调查。寄生寄主是在生长季节(2-10月)从油菜上寄生的植物上采集的，在夏季生产期间(11-1月)从普通杂草Rapstrum rugoum L.(Brassicaceae)上的自然小菜蛾种群中采集的。共记录到5种主要寄生蜂，按丰度大小排序为：半滑翅小蜂Diades ma Semiclausum Hellen(膜翅目：姬蜂科)>；颈小蜂Diadromus collaris Gravenhorst(膜翅目：姬蜂科)=Apanteles ippeus Nixon(膜翅目：茧蜂科)&Gt；Brachymeria Phya Walker(膜翅目：小蜂科)=大小蜂属Omyzus sokolowskii Kurdjuov(膜翅目：小蜂科)。在所研究的30个小菜蛾种群中，有23个在作物中饲养出寄生蜂，其中21个点采集到半月形拟小蜂，8个点采集到索科洛夫斯克氏原虫，6个点采集到菜蛾，3个点采集到苹果小蜂，1个点采集到赤眼蜂。在冬季和早春两个月，半月板斑潜蝇寄生率和寄主丰度明显增加，寄生率高达95%。2 0 0 0年和2 0 0 1年，颈翼亚种和索氏亚种的寄生率均较低，但寄生率分别未超过11%和8%。将寄生率与其他死亡因素进行了比较，并考虑了每种寄生蜂对该地区害虫生物防治的贡献。从塔斯马尼亚州和西澳大利亚州采集的小菜蛾中也饲养了索科洛夫斯基。这项研究是澳大利亚首次报道索科洛夫斯基氏菌的发病率，但其广泛的分布表明它的建立并不是最近的事件。
Surveys for parasitoids attacking larvae and pupae of Plutella xylostella L. (Lepidoptera: Plutellidae) were conducted in the Brassica agro-ecosystem of the Lockyer valley, south-east Queensland between 1999 and 2002. Parasitised hosts were collected from infested plants placed in Brassica crops during the growing season (February-October) and from the natural P. xylostella population on the common weed Rapistrum rugosum L. (Brassicaceae) during the summer production break (November-January). Five species of primary parasitoids were recorded and they ranked in order of abundance: Diadegma semiclausum Hellen (Hymenoptera: Ichneumonidae) > Diadromus collaris Gravenhorst (Hymenoptera: Ichneumonidae) = Apanteles ippeus Nixon (Hymenoptera: Braconidae) > Brachymeria phya Walker (Hymenoptera: Chalcididae) = Oomyzus sokolowskii Kurdjumov (Hymenoptera: Eulophidae). In crops, parasitoids were reared from 23 of the 30 P. xylostella cohorts studied; D. semiclausum was collected at 21 sites, O. sokolowskii at eight sites, D. collaris at six sites, A. ippeus at three sites and B. phya at a single site. The incidence and abundance of hosts parasitised by D. semiclausum increased markedly in winter and early spring months and parasitism rates as high as 95% were recorded. Diadromus collaris and O. sokolowskii were recovered at low levels throughout 2000 and 2001 but parasitism rates never exceeded 11% or 8%, respectively. Parasitism rates are compared with other mortality factors and the contribution that each species of parasitoid makes to the biological control of the pest in the region is considered. Oomyzus sokolowskii has also been reared from P. xylostella collected in Tasmania and Western Australia. This study is the first report of the incidence O. sokolowskii in Australia; however, its wide distribution indicates that its establishment is not a recent event.