Epitrimerus piri Nalepa Pear rust mite

Heavy infestations of this widely distributed pest sometimes develop on pear trees. The mites then cause extensive bronzing of the underside of leaves and also russeting of ripening fruits, especially around the calyx and on the cheeks. Infestations also occur on Crataegus.


This mite is free-living and deuterogenous, with two adult female forms (protogynes and deutogynes) (see under apple rust mite, Aculus schlechtendali, p. 256). The mites occur on unfurling leaves, blossoms and developing fruitlets but are most numerous beneath the fully expanded leaves. There are several overlapping generations throughout the summer, and breeding continues into the early autumn. Deutogynes (= winter females) appear in increasing numbers from July onwards; they overwinter beneath bud scales and in other shelter, eventually reappearing and depositing eggs in the spring.


Protogyne 0.13-0.16mm long, yellowish to brownish-orange, fusiform and rather flattened; hysterosoma with numerous microtubercles and a distinct mid-dorsal ridge; prodorsal shield with an anterior lobe; prodorsal shield setae short and directed inwards (cf. pear leaf blister mite, Eriophyes pyri, below). Deutogyne similar to protogyne but smaller and the hysterosoma without microtubercles.

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