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Laboratory investigations of the parasites of elm tree bark beetles



Laboratory investigations of the parasites of elm tree bark beetles



Zastita Bilja 37(1): 5-20



The development of the parasites of elm-tree bark beetles Dendrosoter protuberans and Eophylus silesiacus was carried out under insectary conditions. At constant temperature, the period of putting D. protuberans into rearing boxes up to the emergence of the new generation from the logs, attacked by the bark beetle S. multistriatus, is 19.2 days in the second generation. The development of D. protuberans in S. scolytus was 24.5 days on average. E. silesiacus developed in the primary host S. pygmaeus 21.3 days on an average in the second generation. The feeding of wasps D. protuberans on the nectar of sweet basil flowers (Stachis recta) prolonged the life of females for nearly a month, less in the life of males and made possible a greater fecundity and fertility, which helped in the reduction of the bark beetle population. The mustard (Sinapis alba) gave a shorter prolongation of life not only of D. protuberans, but also of Coeloides scolyticida. Wesm. whose primary host is S. scolytus. The white clover (Trifolium repens) had the least effect. By sowing melliferous plants on forest glades and fields surrounding the forest one ought to investigate various species, including those of the genus Umbelliferae and increase in the importance of parasites in the reduction of bark beetles of the elm-tree and at the same time use them in apiculture and in the pharmaceutic industry.

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