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Life history of the predatory mite Lasioseius athiasae (Acari, Ascidae) on various kinds of food substances: a polypeptide analysis of prey consideration

The predacious ascid mite Lasioseius athiasae Nawar and Nasr was found in association with herbaceous plants, fallen leaves and in debris under deciduous fruit trees. The larvae fed and developed on different prey, such as ‘motile stages of the eriophyid grass mite Aceria dioscoridis (Soliman and Abou‐Awad), eggs of house fly Musca domestica L., nymphs of the two‐spotted spider mite Tetranychus urticae Koch, and eggs of the root‐knot nematode Meloidogyne incognita Chitwood. Eriophyids of grasses caused the immature stages to develop faster than did other prey. During the oviposition period, daily consumtion by a female of L. athiasae was 97 A. dioscoridis, four M. domestica eggs, and 10 T. urticae nymphs. The average number of eggs/female per day was 3.21, 1.63 and 1.26 for the above‐mentioned prey, respectively. A low rate was recorded on M. incognita eggs (0.35). The intrinsic rate of increase (rm) was increased when fed on A. dioscoridis, but decreased on other prey species. The multiplication per generation (Ro) was 44.73 times in a generation time (T) of 17.92 days when fed on eriophyids. The eriophyid grass mite proved to be the more suitable prey. The polypeptide analysis of different prey revealed that A. dioscoridis has the most important contents in both number (11 polypeptides) or total molecular weight (682 kDa).