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Among the thrips species feeding on pea plants, the most numerous were: Thrips fuscipennis – occurring on green parts of plants and flowers, Frankliniella intonsa – occurring on flowers and a polyphagous species Thrips tabaci. These species were observed on pea plants from the first decade of May to the end of harvest.The greatest number of thrips was recorded in the first decade of June. Among the recoded species Aeolothrips intermedius was also numerous. This species is a zoophagous however, its larvae can prick and suck plant tissues, especially flowers.
The results of performed studies revealed that in marjoram and basil growing, the species Lygus rugulipennis predominated, and represented 65% of all caught Lygus. Two generations of the pest were observed during the year. Most numerous catches of Lygus were recorded in July and August.
The aphid fauna obtaiend from hazelnut shrubs consisted of 7 species, dominated by the filbert aphid Myzocallis coryli Goetze. The hazelnut aphid (Corylobium avellanae Schrk.) appeared in small counts during the second year of the study. The other species of identified aphids were winged forms, which appeared incidentaly on the monitored hazelnut trees. The highest number of the filbert aphid was observed in the third decade of June. Individuals belonging to this taxon did not pose a severe threat to the population of hazelnut shrubs. The individuals of this aphid species obviously preferred hazelnut trees of the cultivar Halle. The study also revealed that the assemblage of phytophagous insect populating the analzyed plantation was not stable and needed to be monitored.
The objective of this study was to determine the abundance and species composition of thrips recorded on triticum durum in relation to sowing density. The experiment was set up in the Experimental Field Station of Wrocław University of Environmental and Life Sciences, at Pawłowice, Poland, in 2006–2008. It was conducted on triticum durum plants at two different levels of sowing density: 4 and 7 mln seeds per ha. Thrips were observed on plants directly through the whole vegetative season. For identification of species composition insects were collected from ears of plants at the milk maturity stage of grain. The results of performed studies revealed that there was no statistically significant effect of the sowing plant density on the thrips abundance. However, it was found a tendency of increasing number of Thysanoptera, when the plants were sown at 4 mln seeds per ha. During three years of the research, nine species of thrips were identified from Triticum durum. The predominated species were: Haplothrips aculeatus and Limothrips cerealium.
In 2008, the authors observed a carrot crop infestation by Agrotis segetum and its important influence on root yield. A significantly less pest occurrence and harmfulness were recorded in 2009 – the year characterized by frequent rainfall, although the number of caught males was threefold higher as compared to the dry year 2008. Compared the results of 2-year studies with literature data it was found that the pest occurrence was strictly related to the frequency of rainfall during the vegetative season. The significance of presented results was statistically confirmed by the analysis of General Regression Model (GRM). On the basis of obtained results the following conclusion can be drawn, that frequent sprinkling as a factor reducing Agrostis segetum population may be recommended as a valuable supplement to the IPM, especially in case of carrot crops cultivated in organic farming system.
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