Biological Studies on the Stored Grain Mite, Carpoglyphus Lactis (Linne) (Acari: Astigmata:carpoglyphidae)

Abstract

arpoglyphus lactis (Linne.) was extracted from stored grains; wheat, maize and rice; samples were collected from granary stores of Dakhlyia Governorate. In this study experiments were conducted under laboratory conditions at 25±1ºC and 65±5 R.H. to study the effect of dry yeast granules, crushed wheat, crushed rice as a kind of food on biological aspects, fecundity and life table parameters, of the grain mite, C. lactis. The obtained data showed that the ability of mite C. lactis to feed and develop on the above mentioned diets as a sole food sources. The average of total immature stages lasted (13.4 &11.6), (16.5 &15.1) and (20.0 &18.6) days for female and male reared on the same diets, respectively. Female longevity durated 15.1, 18.5 and 19.5 days, while male adulthood averaged 19.3, 24.8 and 25.8 days, when mite fed on the above mentioned diets. Female oviposition period stayed 11.3, 12.9 and 13.6 days and the average number of deposited eggs/female was136.8, 113.9 and 70.5 eggs with a daily mean 12.1, 8.8 and 5.2 eggs on the same tested diets. The life table parameters of C. lactis were affected by different types of food whereas, the mean generation (T) was 20.7, 22.8 and 28.8, while the intrinsic rate of natural increase (rm) values were 0.39, 0.32 and 0.24 when mite fed on the same tested diets at the same pattern.