PHYTONEMATODES INFECTION RATE OF SENPOLIA

This articles deals with the results of an experimental study of different species of the African violet infection by nematodes; both separately and in combination with other parasites. The experiments on the African violet infections by Ditylenchus dipsaci, Aphelenchoides fragariae and Aphelenchoides ritzema-bosi phytonematodes have been conducted. The experiments have been conducted in different combination of nematodes for studying different sorts' resistance. After a five-month cultivation period the extraction of nematodes from leaves, determination and calculation of population were done. The morphological parameters of plants and the level of leaves infection were investigated as well. The nematodes Ditylenchus dipsaci were discovered in sick plants of the African violet. In contrast with the healthy copy, these plants coloration sheet was lighter, the form and nervation folioles differed, and deformed areas of the leaf were pubescent. Such leaf nematodes as Strawberry nematode A. fragariae, nematode of chrysanthemum A. ritzemabosi, nematode of fern A. olesistus turned out to be more dangerous for the African violet. These nematodes parasitized in buds, leaves and blossoms. The following signs were typical for sick violets: deformation of blossoms, small leaves, drying of apical buds, many small-leaved filial crowns, dry necrotic spots on leaves, and suppression of the development of the plant. As a result of our study we may to say that Strawberry nematode (A. Fragariae) are the most pathogenic for the violet of Sapphire Ise sort. On the other hand, the violet of Big Tease sort were more resistant to Strawberry nematode and nematode of fern (A. olesistus) infection, and demonstrated good resistance to nematode of chrysanthemum (A. ritzemabosi).

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