Pear psylla (Cacopsylla pyri) is one of the most important insect pests in pear orchards. The sucking insect causes the blossoms and fruit to drop and reduces the shoot growth. Due to the limited availability of the pesticides and the occurrence of pest resistance, we have to use alternative products. In the thesis, we tried to establish whether the Matrifruit and Deffort products, which are foliar nutrients, decrease the number of nymphs and whether they affect the quality and amount of yield. The experiment included the 'Williams' and 'Bosc' pear cultivars, which we had treated with Deffort and Matrifruit and then compared with a control measurement, in which we did not use the two products. During both treatments, we used the products for integrated protection as well. The results of our research have shown that the Matrifruit and Deffort plant extracts did not affect the quality and the number of fruit per tree. There was no statistically significant difference in fruit quality in 'Bosc' pear cultivar between treatments. In the program treatment of 'Williams' cultivar, the fruits were less firm and had a lower content of soluble solids. We have rejected the hypothesis on the lower abundance of psylla nymphs on the trees in a program treatment, because there was no significant difference in comparison to the control treatment. The Deffort and Matrifuit plant extracts have the same impact on the number of pear psylla as the integrated pest management in controlled observation has. However, in the control treatment the insecticides against pear psylla Cacopsylla pyri had to be used seven times, whereas in the program with the Matrifruit and Deffort products, the insecticides were used only four times. With these products, the use of insecticides can be reduced; however, this method of pest suppression is more expensive.
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