A modified method for mass production of generalist predatory edaphic mite Gaeolaelaps aculeifer as a candidate for biological control of the saffron corm mite

Abstract

ABSTRACT Gaeolaelaps aculeifer (Canestrini) (Acari: Laelapidae) is an edaphic predator of several agricultural pests. Development of simple and low-cost innovative mass rearing techniques and the use of this predator to control soil pests have high importance. For the mass production of G. aculeifer, three growth environments were evaluated. Saffron corms and layered potatoes were used to feed mites, and the mixture of “cocopeat + perlite and saffron chaff” was used to maintain more moisture and to prepare the environment for more ventilation and more porosity, increase hiding places, and provide shelter for the predatory mites to lay eggs. In each treatment, 40 male and female adults of G. aculeifer were released. To feed the predators, approximately 500–800 bulb mites were added to each unit, weekly. The results showed a 27-fold increase in G. aculeifer populations within 30 days. After 60 days, the rate of predator population decreased. Saffron is an expensive plant with abundant benefits and diverse uses. The bulb mite Rhizoglyphus robini is a potentially serious pest damaging saffron corms. This method gives saffron growers the choice to improve the biological control of bulb mites in their saffron fields.