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In the years 2002–2003, observations were carried out in Podkarpackie area on the intensity of occurrence of Arion lusitanicus and damage degree caused to cultivated and uncultivated plants. It was found that A. lusitanicus feeds on awide range of plants, both on crops and commonly occurring weeds. Almost all vegetable species were damaged severely and some plant species from the other groups as well. Indications of the slug feeding were found on 103 plant species
The level of damages in regeneration caused by manual and mechanical technologies under short wood (assortment) and long wood systems of timber harvesting is presented in this paper. Studies were carried out under different physiographic conditions of southern Poland, i.e. mountain regions (Jeleśnia Forest District, Forest Experimental Station in Krynica), submountain regions (Gromnik Forest District), and lowland regions (Krzeszowice Forest District), in coniferous as well as broadleaf stands where final cuttings and selection thinnings were conducted. The lowest damage level was found in mountain stands, and during early thinnings, while the highest level in lowland stands, and during final cuttings. In the case of technologies used under short wood system the level of damages was by 30% higher than in the case of long wood system.
The degree of damage to Rosa rugosa (THUNB.) fruits by larvae of Aspila tenebrosana DUP. and Rhagoletis alternata (FALL.) in the city area of Lublin was investigated.
Long term experiments were conducted with sugar beet on fields with 2- (sugar beet spring cereals), 3- (sugar beet, spring and winter cereals) and 4-years crop rotation (sugar beet, spring cereals, maize for a green crop, winter cereals). Nematode and aphids’ population number, damage caused by beet fly and flea beetle were recorded on each tested field. Increasing of sugar beet frequency in a crop rotation resulted in a significant increase of beet nematode number. In 2-years rotation it was 2.3-times higher then in 3-years rotation and 3.5-times higher comparing to 4-years rotation. Shortage of crop rotation affected the yield of roots and sugar content. The highest reduction was stated in the case of 3-year rotation, possibly due to a high straw content in the soil. The level of leaf damage caused by pests and diseases was determined by weather conditions during the experimental years. The rotation had no any influence on it.
Results of presented experiments indicated, that iron phosphate (III) protected plants of Hosta fortunei and Tagetes patula against damage caused by Iberian slug (Arion lusitanicus) and Whitelipped banded snail (Cepaea hortensis). This product showed very similar results to reference products based on metaldehyde and methiocarb.
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