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Spatial distribution of spotted-wing drosophila (Diptera: Drosophilidae) and other insects in fruit of a sweet cherry (Rosaceae) orchard
The Canadian Entomologist ( IF 0.9 ) Pub Date : 2020-06-22 , DOI: 10.4039/tce.2020.41
Amanda C. Chamberlain , Robert Lalonde , Howard M.A. Thistlewood

Spotted-wing drosophila, Drosophila suzukii (Matsumura) (Diptera: Drosophilidae), is an invasive pest of many small and soft fruits. We present the first results concerning its oviposition in the canopy of a sweet cherry (Prunus avium Linnaeus; Rosaceae) orchard. We examined the distribution of arthropods emerging from fruits of five cultivars ripening successively over seven weeks, in interior and border rows, within four regions of the tree canopy (top/bottom height × north/south aspect), and measured the associated fruit ripeness (ºBrix). Single fruits were reared for more than two weeks: 1328 arthropods emerged from 887 cherries in June, and 10 426 emerged from 1071 cherries in July. When populations were low, significantly more D. suzukii were present in the northernmost row and northern canopy aspect. Later, its distribution with respect to cherry row, height, and aspect was homogenous. Drosophila suzukii density per sweet cherry was highest in the latest ripening cultivar, when its distribution was not homogeneous; significantly more D. suzukii were in the centre than the southernmost row, in the lower canopy, and the southern aspect, than elsewhere. In the early season, single egg clutches were found without aggregation. As population density increased, so did intraspecific aggregation, but D. suzukii did not co-exist with other Drosophila Fallén species, nor with Rhagoletis indifferens Curran (Diptera: Tephritidae) when present.



中文翻译:

甜樱桃(蔷薇科)果园的斑翅果蝇(双翅目:果蝇)和其他昆虫的空间分布

斑翅果蝇Drosophila suzukii(Matsumura)(Diptera:Drosophilidae)是许多小而软的果实的入侵害虫。我们提出了关于它在甜樱桃(李子李属;蔷薇科)果园冠层中产卵的第一个结果。我们研究了七个星期连续成熟的5个品种的果实中节肢动物的分布情况,这些节肢动物在树冠的四个区域(顶部/底部高度×南北向)内部和边界行中进行了测量,并测量了相关的果实成熟度( ºBrix)。单果饲养了两个多星期:6月,从887棵樱桃中收获了1328节节肢动物,7月从1071棵樱桃中收获了10 426节节肢动物。当人口少时,铃木D.明显更多出现在最北行和北冠层。后来,它在樱桃行,高度和外观方面的分布是均匀的。甜樱桃的分布不均匀时,每个甜樱桃的果蝇铃木密度最高。显著更D. suzukii是在中心比最南端的行,在较低的树冠,和南部的方面,比其他地方。在早期季节,发现单个卵形离合器没有聚集。随着种群密度的增加,种内聚集也随之增加,但是铃木与其他果蝇法属物种不同,也与不存在的Rhogoletis indifferens Curran(Diptera:Tephritidae)不共存。

更新日期:2020-07-15
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