2.2.97
ECOLOGICAL NICHES OF PLANT PATHOGENS IN AGROECOSYSTEMS

VA CHULKINA, EU TOROPOVA

Novosibirsk Agricultural University, 633128, Krasnoobsk, Novosibirsk region, a/y 18, Russia

Background and objectives
Original ecological niches of plant pathogens and their changes in agroecosystems are very important for the monitoring, prognosis and control of plant diseases.

Results and conclusions
On the basis of analysis of the most widely spread and harmful plant diseases in Siberian agroecosystems we propose four main and 10 additional ecological niches of pathogens conditioned by their different main and additional transmitters in time (soil, plant residues, seeds) and in space (air streams, rain droplets, insects). The soil-borne pathogens have their main ecological niche in the underground organs and an additional one - the conductive system of plants; the airborne pathogenshave the leaves and stems (main), generative organs and conductive system (additional); seed-borne pathogens have the generative (main) and underground organs (additional); transmissive pathogens have the conductive system (main) and underground and foliar organs. The ecological niches can be changed (restricted, substituted, lost) under influence of fungicides, varieties and technology.