The effect of temperature and humidity on the grazing activity of Deroceras reticulatum (O. F. Müller, 1774) and the damage to rape plants
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Department of Zoology, Institute of Plant Protection – National Research Institute, Poznań, Poland
Department of Mathematical and Statistical Methods, University of Life Sciences, Poznań, Poland
Submission date: 2010-08-29
Final revision date: 2011-01-19
Acceptance date: 2011-03-17
Publication date: 2011-12-11
Folia Malacol. 2011;19(4):267-271
Winter rape is susceptible to damage caused by D. reticulatum (O. F. Müller) mainly in the early phases of the plants' development. The degree of damage and the size of yield losses depend on the slug population and the grazing activity, which are governed by many environmental factors. Laboratory studies were performed to analyse the rate and amount of damage to rape plants (2–3 leaf stage) caused by D. reticulatum, and the effect of temperature and soilhumidity on the slug's grazing activity. With increasing air temperature (up to 16°C) the amount of damage increased, but the effect was not lasting. The slugs were also active at low temperatures (+1°C), and although their grazing was less intense, the amount of damage after seven days could reach an average of 34%. In laboratory tests, the soilhumidity had no marked effect on the amount of damage done by the slugs.
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