Incidence of Pear Black Necrotic Leaf Spot and its Control by Top-Grafting

Nam, Ki Woong; Myung, Inn Shik

Research in Plant Disease 2002;8(4):254-257.
Published online December 30, 2002.

배나무 잎검은점병의 피해상황과 방제

남기웅, 명인식

Incidence of Pear Black Necrotic Leaf Spot and its Control by Top-Grafting

Ki Woong Nam, Inn Shik Myung

Abstract

It was conducted to investigate an effective control measure of the black necrotic leaf spot disease on pear. The disease commonly occurred in major cultivation areas of Korea revealed 5.6% infection rate on the widely growing cultivar Niikata. The disease substantially reduced yield and quality of pear fruits, however, it has never been controlled by chemicals. Renewal of the pear trees to resistant cultivar was found to be the most effective to control the disease. As a result, the disease did not developed for 2 years on the diseased Niikata that was top-grafted with resistant cultivars Soowhang and Whasan. Top-grafting with resistant cultivars was recommended for the pear trees showing over 80% infection rate and lower than 70% fruit yield compare to standard production.

Key Words: a virus disease, black necrotic Leaf spot, disease management, pear