Abstract
Arion lusitanicus Mab. has two peaks of abundance in the vegetation season. One falls on mid-May when immature individuals dominate in the slug population. The juveniles feed on young plants and grow rapidly. Another mass occurrence of the pest falls on August at the emergence stage of winter plants. The population density remains high during 4 to 6 weeks, almost till the end of September. Adult individuals are predominant in the slug population in late summer and autumn, whereas juveniles hatched from the eggs laid in August appear later.
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