Fruit growing
and viticulture of South Russia

Annotation

We carried out a two-year research in the affected by phytoplasma disease (Bois noir) Chardonnay vineyards in the South-West zone of Crimea. In 2014, when 26.8 % of the vine bushes have been demonstrated the symptoms of phytoplasma disease, and the damage degree constituted on average 2.5 affected shoots per bush, we found a significant reduction in the average number of bunches on the affected bushes, specifically by 34.5 %; the average bunch weight was reduced by 23.5 %; the estimated vine yield went down by 50.4 %. In 2015, when 62.7 % of vines showed the symptoms of the disease, and the damage degree constituted on average 3.7 affected shoots per bush, the reduction in the average bunch weight reached 61.7 %, that of the vine yield � 66.7 %. Monitoring of Auchenorrhyncha revealed four native species that can act as phytoplasma vectors spreading the disease from the infected to healthy plants: Hyalesthes obsoletus, Hyalesthes luteipes, Reptalus panzer, Fieberiella florii. The number of the pests was 1-5 samples in a trap during June-September period. When studying the possibility of reducing the negative impact of Bois noir on grape-vines in case of using plant growth bioactivators K-Humate-Na + Gumasporin and Sana-Tam, as well as bactericide Fitoplazmin (water-soluble concentrate) we weren�t able to obtain reliable data on curbing the spread of phytoplasmos with the abovementioned drugs under test rates and frequency of treatments. Removing the affected vine shoots resulted in 14.8 % reduction of the number of affected by Bois noir plants and reduction in the damage degree by 1.2 times. Combining agricultural practices with experimental preparations had, to varying degrees, a positive impact on certain quantitative yield indicators; the influence on sugar content in the juice of the berries has not been established. The obtained results are preliminary; the research will be continued.

Annotation

The article reports the results of multi-year monitoring of zonal peculiarities of development of complex of diseases and pests on grapes plantations of the Crimea under the conditions of climate change, wide introduction of foreign grapevine planting material and significant change of the range of plant protection means. It has been established that the following pests and diseases are wide spread annually in all viticultural zones: downy mildew, powdery mildew, Botrytis cinerea, Lobesia botrana, thrips, Eriophyes vitis; focally develop Schizotetranychus pruni and Tetranychus urticae, Viteus vitifolii, bud pests (Otiorrhynchus spp., Theresia ampelophaga and others); while black rot, black spot, Alternaria spp. and Helicoverpa armigera are characterized by periodic injuriousness. Due to changes in the assortment of insecticides and acaricides applied in the vineyards we can observe the increase in sucking arthropod populations of planting: Eriophyes vitis Pgst., a complex of phytophagous thrips (Thripidae), leaf form of Phylloxera vastatrix. On the other hand, there was a decrease in the spread of spider mites (Tetranychidae). The decline in the level of agric and technical practices applied on industrial vineyards resulted in the tendency to accumulate the bud pests and pests that damage the perennial wood of grapes plants. In recent years the following invasive for the Crimea diseases and pests have progressively developed in the vineyards: Bois noir, leafhoppers (Stictocephala bubalus, Arboridia kakogawana, Scaphoideus titanus). It was found that the following identified aboriginal species of cycads pose have a potential hazard for the stable development of Crimean viticulture: Hyalestes obsoletus Sign., Hyalesthes luteipes Fieb., Reptalus melanochaetus Duf. They are capable to spread the phytoplasma infection.