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Studies on palatability of some commom weed species, herbaceous plants and oilseed rape to D. reticulatum, A. lusitanicus and A. rufus slugs have been carried out under laboratory conditions. In food choice trials the rate and degree of damage to seedlings and leaf disks were determined for 20 plant species. The conducted experiments have also permitted to establish, which plant species were preferred or were not accepted by particular slug species. It was found that the studied slug species preferred seedlings and leaves of Brassica napus and Papaver rhoeas, but showed no preference for Epilobium hirsutum, Geranium sanguineum and Saponaria officinalis plants. As to the remaining plant species under study, the preferences exhibited by particular slug species were quite diverse.
Studies on food preference of two-spotted spider mite Tetranychus urticae Koch were carried out on 21 perennial weed species in cereals. Feeding of females of two-spotted spider mite placed on leaf disk of selected weed species lasted the longest on Ranunculus regens and Amoracia lapathifolia. Meanwhile, phase of initial feeding of two-spotted spider mite was the shortest. Time spent on searching for food varied, and the longest one was on Helichrysum arenarium, Agrimonia euparoria and Saponaria officinalis, while the shortest on R. regens and A. lapathifolia. However, if females of two-spotted spider mite had for choice 21 perennial weed species, then they preferred most Convolvulus arvensis, Urtica dioica and Ballota nigra, but least H. arenarium, Artemisia absinthium, Artemisia vulgaris, Medicago palcata and Taraxacum officinale.
The study on food acceptance of the two-spotted spider mite (Tetranychus urticae Koch) was carried out on 10 oat varieties. The two-spotted spider mite accepted all provided oat varieties. Females of the two-spotted spider mite, put on leaf cuttings of oat varieties fed permanently for the longest time on Koneser variety. For the shortest time, however, the two-spotted spider mite remained in the phase of initial feeding. However, the time spent on seeking food varied from the longest period on Akt and Sławko varieties to the shortest one on Koneser variety. Having a choice, females of the two-spotted spider mite, most accepted Szakal, Cacko and Kresus, and least Stoper and Sam varieties.
Studies on food preference of herbivores include no-choice test and test with choice or multiple choice. Conclusions from statistic analyses of these tests are compared descriptively. The definition of compatibility index and consumption growth index has enabled us to use nonparametric test for verification of hypotheses about homogeneity of the consumption growths of selected plant species under no-choice and multiple choice conditions. The studies were conducted on food preference of the slug Deroceras reticulatum. It has been found that Chamaenerion angustifolium, Geraniumpusillum and Potentilla anserina can be used to reduce this slug feeding on cultivated plants. It has been also found that seedlings of Polygonum aviculare can be used as alternative food for slugs.
Impact of food type on long term consumption kinetics in group-housed domestic cats (Felis catus). The aim of the current research was to assess the impact of the type of dry food on the long term acceptance in cats, expressed as consumption curves. A group of 14 adult neutered domestic cats were subsequently offered three types of products: economy, medium and premium. The consumption of food has been carefully monitored each day of the experiment, which enabled the drawing of the precise consumption curve. The average daily consumption showed differences between feeding periods (98.33%, 61.17% and 55.04% for premium, medium and economy diet type, respectively). In all groups the monotony effect has been observed, but the relative stability of the consumption has been observed only in cats fed with the premium type of food. The attractiveness of the economy type of food was distinctively low, resulting in a regularly waved consumption curve. It can be concluded, that the prolonged offering of a particular type of complete dry pet food within the limits of metabolizable energy requirements may potentially lead to adverse consequences for cats. The food consumption level that supplies the minimal daily energy amount can likely result in imbalanced macronutrient intake.
Morphological, anatomical and chemical plant properties play an important role during host’s recognition by the aphids. Removal of the surface compounds with the use of organic solvents clearly increased studied parameters of the grain aphid Sitobion avenae and bird cherry-oat aphid Rhopalosiphun padi on the waxy genotype RAH 122. Moreover, extracts from RAH 122 genotype applied on of wax-less genotype RAH 366, significantly decreased the number of alate forms and percentage of infested plants by both aphid species.
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