engleski

Control of Psocids in stored wheat and its products

Psocids (Psocoptera) are insects widespread in stored wheat and its products (flour, dough, gric, etc.) in most storage in the Republic of Croatia. During the years 1975-1999. 17 species of Psocoptera, suborder Trogiomorpha, Troctomorpha and Psocomorpha, were investigated as following: Trogium pulsatorium, Lepinotus reticulatus, L.inquillinus, Dorypteryx domestica, Psillipsocus ramburi, f. destructur, P. ramburi f. troglodytes, Liposcelis bostrichophila, L. corrodens, L. brunnea, L. decolor, L. entomophila, L. mendax, L. paeta, L. pearmani, L. pubescens, L. tricolor, Lachesilla pedicularia. On stored wheat in silos most widespread was genus Liposcelis, species L. decolor. The detection of L. tricolor, which was, in our opinion carried into the silos at the harvest time, is especially important. Psocids are harmful insects. They transmit harmful microorganisms - fungi and bacteria on their bodies, and in faeces, spreading them all over the store house and infesting the products. Psocids are found to be harmful pests on seed goods as well for causing damage on seed kernels. Control of Psocoptera in stored wheat and its products is partly based on the integrated pest menagament (IPM): sanitation of store houses (by cleaning and removing old wheat supply, desinfection of empty spaces with insecticides of a.i. pirimiphos-methyl, dichlorovos, pyrethrin); by phisical methods (aeratiopn on low temperature 5-10 oC, high temp. 32-34 oC). Chemical control of psocids was considerably rare, applied only on the packed final products by using fumigants based on phosphine. As non-chemical grain protectant inert dusts - diatomaceous earth has been used. As the alternative measures for the control of psocids on the small quantity of stored wheat and packed flour, etheric oils and dust of domestic aromatic plants (Lavandula officinalis, Thymus vulgaris, Rosmarinus officinalis, Laurus nobilis)have been used.

Psocoptera; store houses; IPM

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