The development of phytosanitary monitoring methods – creating of a schematic scale for as-sessing the development of Alternariosis on grape leaves

To ensure consistent good quality grape yields it is necessary to minimize losses associated with affection of plants by various dis-eases. One the main conditions effective control phyto-pathogens a timely monitoring, revealing and assessing harmful or-ganisms development intensity. In modern research, in order improve accuracy reliability quantitative characteristics disease devel-opment intensity, as well comparability results obtained, pro-posed use “set standard diagrams” or “schematic scale” - set illustrations depicting an increasing percentage damage surface one another plant organ. date, similar "sets diagrams" were proposed for such diseases mildew, anthracnose leave rust. The article presents creating new "schematic scale" intensity Alternariosis recorded importance at recent time climate change. scale was developed using colored black–and-white pho-tographs leaves affected varying degrees de-termine real digital form. Scale levels established accordance minimum maximum values degree. Validation carried out two groups assessors differ-ent experience accounting. determination coefficient (R 2 ) regres-sion line absolute error variance demonstrated increase accu-racy, repeatability reproducibility estimates scale”. Using made possible in-crease assessment leaves.