Peculiarities of development and malfunction of the black currant big bud mite

Black currant (Ribes nigrum) occupies large areas among berry crops in the central part of Russia. Its value is due to the high content of vitamin C, P-active substances, microelements and other biological active compounds, sugars, organic acids, pectin, tanning, coloring substances in berries. This culture is also valued for its high nutritional value, especially in the processing industry. Black currant is characterized by high yields, early fertility, simplicity and a high breeding coefficient, technological cultivation and harvesting. Currently, this culture occupies the largest land area in the gardens. However, its average yields in our country are 4-5 times lower than in the regions of its industrial cultivation in Europe. Insufficient yields are to a great extent related to the losses from pests and pathogens. This article considers one of the most dangerous pests in the currant, that is black-currant big bud mite, which is also a carrier of a dangerous disease - reversion disease of black currant. Currant big bug mite (Friophyes ribis Nal.), one of the most dangerous pests of black currant is widely-spread in Russia. It damages black, white and red currants, as well as wild forms of black currant. Currant bud develops within the buds. When feeding, it releases gall-forming substances with saliva into the plant tissue, as a result of which the buds do not develop normally. By autumn, the damaged buds become rounded, larger, like small cabbage heads. In spring, these buds, as a rule, do not open and dry up. The crop of berries sharply decreases, the plantation dies prematurely. The results of studies of the effects of weather conditions on the harmfulness of the bud mite on the black currant and its reproduction in different phases of black currant development are presented in the article.