The red palm mite, Raoiella indica (Acari: Tenuipalpidae), is a serious pest of coconut plantations in tropical countries such as Brazil. Ecologically-sound control strategies have been sought for this pest; however, the potential of entomopathogenic fungi such as Beauveria bassiana (Hypocreales: Cordycipitaceae) in controlling this pest, as well as its compatibility with co-occurring natural enemies, remains poorly investigated. Thus, the present study was conducted to investigate the potential of four B. bassiana strains in controlling R. indica, as well as the compatibility of the most pathogenic fungal strain with the predatory mites Amblyseius largoensis and Typhlodromus ornatus (Acari: Phytoseiidae). Briefly, the pathogenicity of four B. bassiana strains (Bb-032, Bb-053, Bb-057 and Bb-086), isolated from coconut pests, were tested against R. indica. The B. bassiana strain Bb-032 was selected for further bioassays for being the most pathogenic to R. indica. The red palm mite survival and mean survival time drastically decreased when exposed to B. bassiana strain Bb-032 at both LC₅₀ and LC₈₀. In contrast, neither survival nor mean survival time of A. largoensis and T. ornatus were affected by the exposure to LC₅₀ and LC₈₀ of B. bassiana strain Bb-032. The fungal strain showed considerable selectivity to the two predatory mites; however, at its estimated LC₈₀ for R. indica, reduced oviposition, egg viability and the instantaneous rate of increase (r_i) were generally observed for both natural enemies. Therefore, B. bassiana holds potential promise for controlling R. indica in addition to being generally selective to non-target predatory mites.

红棕螨Raoiella indica (Acari: Tenuipalpidae) 是巴西等热带国家椰子种植园的严重害虫。已经为这种害虫寻求了生态无害的控制策略；然而，昆虫病原真菌如球孢白僵菌（Hypocreales：Cordycipitaceae）在控制这种害虫方面的潜力，以及它与共存天敌的相容性，仍然缺乏研究。因此，本研究旨在调查四种B. bassiana菌株在控制籼稻中的潜力，以及最具致病性的真菌菌株与捕食性螨Amblyseius largoensis和Typhlodromus ornatus的相容性。（螨虫：植防科）。简而言之，从椰子害虫中分离出的四种球孢球虫菌株（Bb-032、Bb-053、Bb-057 和 Bb-086）的致病性针对R. indica进行了测试。选择球孢杆菌菌株 Bb-032 进行进一步的生物测定，因为它对籼稻的致病性最强。当在 LC ₅₀和 LC ₈₀处暴露于B. bassiana菌株 Bb-032时，红棕螨的存活率和平均存活时间急剧下降。相比之下，A. largoensis和T. ornatus 的存活时间和平均存活时间均不受暴露于 LC ₅₀和 LC _{80 的影响}。B.bassiana菌株 Bb-032。真菌菌株对两种捕食性螨类表现出相当大的选择性；然而，在其估计LC ₈₀为R.籼稻，减少产卵，卵子活力和增加的瞬时速率（R_我）两个天敌普遍观察到。因此，B. bassiana除了对非目标捕食性螨具有普遍选择性外，还具有控制籼稻的潜在前景。