Integrted control of bacterial wilt of potato by the relation of appropriate soil fumigant, cultivar and planting date

Abstract

Integrated control of bacterial wilt of potatoes was successfully achieved in the fall cropping in Nagasaki, Japan. Three methods were combined; soil fumigation by application of chloropicrin, use of the relatively resistant cultivar Meihou, and late planting to aviod higher temperatures in the planting season. The incidence of bacterial wilt in Meihou which was planted in mid-September after fumigation of chlorpicrin at a dose of 20 l /10a was lower than that of the susceptible cultivar, Dejima planted in early September after fumigation of chlorpicrin at a dose of 30 l /10a. It appears that integrated control enabled to reduce the dosage of chlorpicrin from 30 l /10a to 20 l /10a in severely infested fields.