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The numbers of Curculionoidea showed a growing tendency during the initial four years of alfalfa crop use for green fodder, but in the subsequent years they decreased significantly. The number of species increased with the plantation age.
The research on the occurrence of Curculionoidea carried out in 1990-1995, in south-eastern Poland showed that Sitona humeralis Steph. was the most numerous species. Its participation among all the collected Curculionoidea was 69.4%. Other species occurring on alfalfa crops were: Hypera postica (Gyll.)- 7.7%, Sitona lineatus (L.)- 5.0%, Sitona hispidulus (Fabr.) - 4.7% and Apion tenue Kirby 4.4% of...
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