Effect of Passage on the Development of Thiophanate Methyl Resistant in Penicillium expansum Causing Blue Mold of Pear

Blue mold of Pear caused by Penicillium expansum, causes substantial losses on stored pears worldwide. Effect of Continuous passage of the sensitive isolate Pe-10 on thiophanate methyl increased thiophanate methyl resistance. But culturing of the pathogen on thiophanate methyl alternately or in a mixture with Polyram, and Dithane Z-78, the growth was completely reduced while the Kocide and acrobat growth was not reduced compared with the first passage and passage 2nd, 3rd, 4th and 5th growth was decreased. The use of thiophanate methyl in a mixture with Polyram, Dithane Z-78, Kocide, and acrobat reduced the growth of resistance significantly. Dithane Z-78 appeared to be more productively than others in mixtures. In vivo, it was observed that the use of thiophanate methyl with polyram, Dithane Z-78, Kocide, and acrobat decreased disease incidence. Dithane Z-78 was most effective than other fungicides. When the thiophanate methyl was applied in combination with Polyram, Dithane Z-78, Kocide, and acrobat, there was a significant reduction in the disease resistance, indicating a decrease in the resistance in the pathogen at the 5th passage. Here, acrobat was most effective.

RAMESH BAVISKAR*1 and LAXMAN RATHOD2 Click here to download file

Research Article | Published online : 30-Dec-2023