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Influence of host plant species on the development and reproduction of hawthorn spider mite Tetranychus viennensis Zacher Antibiosis of five alfalfa cultivars to two colour morphs of Acyrthosiphon pisum Influence of variable nitrogen fertilization on growth and development of aphid Aphis gossypii THE MARKING METHOD OF EQUAL PROBABILITY FOR EQUAL MARK AND ITS APPLICATION TO THE SELECTION OF AMELIORATED WALNUT VARIETIES Sublethal effects of selected insecticides on the hawthorn spider mite, Tetranychus viennensis Improvement upon the parameter estimation models of the fecundity table of insect experimental population when adult period longer than that of larva The effects of temperature on laboratory population of Cryptolaemus montrouzieri Mulsant