Rozwój kapturnika zbożowca (Rhyzopertha dominica F.) na ziarnie jęczmienia browarnego i pastewnego

Abstract

Summary A study was carried out to determine the effect of barley grain used for different purposes (malt or fodder production) on the development of the lesser grain borer (Rhyzopertha dominica F.). The development of the pest insect was investigated on the grain of barley cultivars belonged to two different utilization types. The grain from cultivars used in the brewery industry (Presige, Sebastian, Żeglarz, Stratus, Philadelphia, Blask, Mauritia, Bolina and Class) and from fodder cultivars (Frontier, Orthega, Antek, Justina, Widawa, Tocada). The results revealed that both fodder and malt barley grain provided a suitable habitat for the development of the lesser grain borer. Differences in the number of offspring growing on the grain of either types of barley cultivars proved to be non-significant. However, it was shown that the lesser grain borer produced much more dust and caused larger grain mass loss when foraging on malt cultivars. Among the malt cultivars, cultivar Mauritia was the most resistant one to foraging by R. dominica. Out of the fodder cultivars, grain produced by the cultivar Tocada was the least damaged. There was a positive correlation between the number of the lesser grain borer’s offspring imagines and the mass of dust as well as loss of grain mass. It was found that an increase in the number of imagines was more strongly correlated with the grain mass loss than with the mass of produced dust.