In 2010–2011 tests were carried out under laboratory conditions on the effectiveness of Nemaslug, applied in three doses, to reduce the damage done to plants of winter rape and Chinese cabbage (at the 4–5 leaf stage) by the slug Deroceras reticulatum. The aim of the research was to evaluate the usefulness of various doses of the nematode Phasmarhabditis hermaphrodita in reducing the number of D. reticulatum in populations in Poland. Observations were done 24 hours after the application of the nematodes, and then consecutively every two days for the period of two-and-a-half weeks. The survival of the slugs were determined, as well as the rate and quantity of plant damage caused by them. The results of the tests showed that the applied doses of the nematode P. hermaphrodita were effective against D. reticulatum. Nine days after the application of the biocontrol agent, there was a significant reduction in damage to the rape and cabbage plants, and after 9–15 days a large proportion of the slugs died. The results suggest that all of the tested doses of the nematode may potentially be useful in controlling D. reticulatum on horticultural and agricultural crops. However, due to particular humidity and temperature requirements of P. hermaphrodita, it is necessary to carry out detailed work to determine the conditions for its application.
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