Исследование мучнистой росы клена остролистного и разработка мер борьбы с ней в условиях города Санкт-Петербурга и Ленинградской области

Abstract

Now to protection of ornamental plants in St.-Petersburg and area it is not given proper attention. There are no data on specific structure of activators of mealy dew of trees and bushes, bioecological features of development of the activator of disease are not studied. Exact data on an aetiology (reasons) of disease, on distribution and degree of its development are necessary for a correct choice, the effective and timely organisation of actions for protection of plants against illnesses in studied territory.