R&D Department, Biobest Group N.V., Westerlo, Belgium.
Elytra Agroscience Services, València, Spain.
Pest Manag Sci. 2020 Jul;76(7):2500-2504. doi: 10.1002/ps.5791. Epub 2020 Mar 5.
Soil-dwelling predatory mites of the family Laelapidae are augmentatively released for the biological control of several pests with an edaphic phase in numerous greenhouse crops. Yet, there is no information about the potential of releasing these predators to control pests in open field crops. We tested, during two consecutive years, the potential of augmentative releases of Gaeolaelaps aculeifer, alone or in combination with coco fiber discs as mulch, to reduce the damage caused on citrus fruits by the invasive thrips Pezothrips kellyanus in Mediterranean citrus. In a separate trial, we also compared different mulch types (coco fiber discs, rice husks or a mixture of sawdust and wheat bran) for their potential to support the establishment and population development of the predatory mites after their release.
The percentage of unmarketable fruits caused by P. kellyanus was significantly reduced in the plots where G. aculeifer was released. The addition of coco fiber discs did not reduce further the percentage of unmarketable fruits. Sawdust + bran mulch was the most effective in preserving immature and adult predatory mite population after their release.
Augmentative releases of G. aculeifer have the potential to reduce fruit damage caused by P. kellyanus in citrus. © 2020 Society of Chemical Industry.
土壤捕食性螨虫属于捕食螨科，可大量释放用于防治许多温室作物中具有土壤期的几种害虫。然而，目前尚不清楚释放这些捕食者来防治露天作物害虫的潜力。我们在连续两年的时间里测试了大量释放捕食螨 Gaeolaelaps aculeifer 单独或与椰子纤维盘（作为覆盖物）结合以减少入侵蓟马 Pezothrips kellyanus 对地中海柑橘造成的损害的潜力。在单独的试验中，我们还比较了不同的覆盖物类型（椰子纤维盘、稻壳或木屑和麦麸的混合物）在释放后对捕食螨的建立和种群发展的潜在支持作用。
释放 G. aculeifer 的地块中，P. kellyanus 造成的不可销售果实的百分比显著降低。添加椰子纤维盘并不能进一步降低不可销售果实的百分比。木屑+麦麸覆盖物在释放后对保持未成熟和成年捕食螨种群最为有效。
大量释放 G. aculeifer 有可能减少柑橘中 P. kellyanus 造成的果实损害。 © 2020 英国化学学会。
