Развитие и вредоносность церкоспореллезной прикорневой гнили пшеницы озимой в зависимости от сроков сева в Полесье Украины

The study presents research results on the effect of sowing terms on the distribution, development and harmfulness of Pseudocercosporella herpotrichoides. It was established that the optimum wheat sowing term in the Ukrainian Polesia is the second third of September. A coefficient of the disease harmfulness increased at postponed sowing from 19.3% to 24% at the first level of lesion, and from 51.6% to 58% at the third level of lesion.