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Abstract

The insecticidal efficacy of the experimental bioinoculants (Natur Nova, Natur Agro Hungary Ltd., Hungary) containing Beauveria bassiana (Bals.-Criv). Vuill. and Metarhizium anisopliae Metschnikoff against stored product pests modelled by granary weevil, Sitophilus granarius L. was evaluated on wheat in laboratory tests. In order to comparability, two applications were also set up: one purely ash-treated grain treatment against wireworms and a soil-injected one. Our results confirmed that some biopesticides can exert unexpected effect on non-target arthropods. However, the examined biopesticides were as empirically effected against the target arthropods regarding wireworms. Nevertheless, the application exempt from ash of the examined bioinoculants Natur Nova containing B. bassiana and M. anisopliae were not suitable for the elimination of the stored product pests modelled by S. granarius. In contrast, the putative plant protection effect of these biopesticides was observed in the course of applying the agents in the recommended environment and pest species as well as when applying them with ash carrier.

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The onion thrips (Thrips tabaci Lindeman) has been known for a long time as a pest of onion. The damage hinders the development of the onion, causing the plant to end its development earlier than usual, so there may be a decrease in crop yield, too. Control of the onion crop against the onion thrips is the basis of its protection. The chemical protection is difficult owing to the hidden lifestyle of the pest and the wax cover on the leaf of the onion. The natural enemies of the onion thrips can reduce the population only to a small degree. One of the efficient and environmentally friendly protection methods could be the production of thrips resistant onion varieties. The thrips susceptibility of onion varieties (dry onion, leek, green bunch onion and chive) produced in Hungary is unknown. Our aim was to investigate the thrips susceptibility of commercially produced onion varieties and to work out the methods of a large-scale investigation.

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