The effect of elm bark thickness on Scolytus scolytus (F.) (Coleoptera: Scolytidae) growth in laboratory conditions
1995
Manojlovic, B. | Sivcev, I. (Institut za zastitu bilja i zivotnu sredinu, Beograd (Yugoslavia))
Growth conditions of Scolytus scolytus were the most favourable on elm tree, where the bark was 5-8 mm thick, and this was in lower part of middle aged tree. The lenght values of maternal halls and the number of larvae in every maternal gallery of S. scolytus at all three levels of bark thickness, were higher in the 1st than in the 2nd generation. The longest maternal halls and the greatest number of larval halls per maternal gallery were registered in the small trunks of elm under the bark 5-8 mm thick in the 1st, and considerably lesser in the 2nd generation. In both generations, the lowest number of maternal galleries was in trunks under the thinest bark. The growth of S. scolytus at a constant temperature of 27-29 deg C lasted shorter in the 1st in relation to the 2nd generation and it increased with bark thickness. In the 2nd generation, S. scolytus grew for about 3 days longer in relation to the 1st generation
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