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Five commercial chemicals, Dimethomorph, Foseyl-Al, Oxadixyl +Mancozeb, Propamocarb hydrochloride, and Metalaxyl, were tested for control of tobacco black shank (Phytophthora nicotianae) and/or delaying buildup of the resistant population to Metalaxyl which has been used for control of the disease in Korean tobacco farms. Propamocarb hydrochloride seemed to have a cross-resistance to the Metalaxyl resistant isolates showing similar response with Metalaxyl in vitro. Meanwhile, Dimethomorph+Mancozeb and Oxadixyl+ Mancozeb were selected to be the promising chemicals which are able to be alternative to Metalaxyl for the black shank control in accordance with in vitro and in field trial.


Five commercial chemicals, Dimethomorph, Foseyl-Al, Oxadixyl +Mancozeb, Propamocarb hydrochloride, and Metalaxyl, were tested for control of tobacco black shank (Phytophthora nicotianae) and/or delaying buildup of the resistant population to Metalaxyl which has been used for control of the disease in Korean tobacco farms. Propamocarb hydrochloride seemed to have a cross-resistance to the Metalaxyl resistant isolates showing similar response with Metalaxyl in vitro. Meanwhile, Dimethomorph+Mancozeb and Oxadixyl+ Mancozeb were selected to be the promising chemicals which are able to be alternative to Metalaxyl for the black shank control in accordance with in vitro and in field trial.