The pink citrus rust mite, Aculops pelekassi (Keifer) (Acari: Eriophyidae), is a serious pest and is widely distributed in most citrus-growing areas of the world. Euseius sojaensis (Ehara) and Amblyseius eharai Amitai and Swirski (Acari: Phytoseiidae) are indigenous generalist predatory mites in Japanese citrus orchards. Although these two species prey upon some eriophyid mites, A. pelekassi is not considered to be a suitable food for their development and reproduction. In this study, we examined the suppressive effect of these two predators on A. pelekassi density when provided with pine pollen as an alternative food. In a growth chamber experiment, pollen provisioning led to population increase of E. sojaensis and A. eharai, but only E. sojaensis significantly decreased A. pelekassi populations. In a field experiment, E. sojaensis release suppressed A. pelekassi populations on both leaves and fruit. Fruit injury by A. pelekassi in October was suppressed by E. sojaensis release or pollen provision. These results suggest that E. sojaensis can serve as an effective biological control agent against A. pelekassi when provided with pine pollen. Therefore, maintaining populations of E. sojaensis by means such as pollen provisioning could lead to successful biological control of the eriophyid mite in Japanese citrus orchards.

中文翻译：

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向 Euseius sojaensis 或 Amblyseius eharai (Acari: Phytoseiidae) 提供花粉对粉红色柑橘锈螨 Aculops pelekassi (Acari: Eriophyidae) 种群的影响

粉红色柑橘锈螨 Aculops pelekassi (Keifer) (Acari: Eriophyidae) 是一种严重的害虫，广泛分布于世界上大多数柑橘产区。Euseius sojaensis (Ehara) 和 Amblyseius eharai Amitai 和 Swirski (Acari: Phytoseiidae) 是日本柑橘园中的本土通才掠食性螨类。虽然这两个物种捕食一些 eriophoid 螨，但 A. pelekassi 不被认为是它们发育和繁殖的合适食物。在这项研究中，我们研究了当提供松花粉作为替代食物时，这两种捕食者对 A. pelekassi 密度的抑制作用。在生长室实验中，花粉供应导致 E. sojaensis 和 A. eharai 的种群增加，但只有 E. sojaensis 显着减少 A. pelekassi 种群。在田间试验中，E. sojaensis 的释放抑制了叶子和果实上的 A. pelekassi 种群。A. pelekassi 10 月的果实损伤被大豆 E. sojaensis 释放或提供花粉抑制。这些结果表明，当提供松花粉时，大豆 E. sojaensis 可作为针对 A. pelekassi 的有效生物防治剂。因此，通过提供花粉等手段维持大豆 E. sojaensis 的种群可以成功地对日本柑橘园的螨虫进行生物防治。