Evaluation of metalaxyl sensitivity among Phytophthora infestans by poisoned food technique using corn agar
2011
Pipat Chiampiriyakul(Maejo University, Chiang Mai (Thailand). Faculty of Agricultural Production. Department of Plant Protection) E-mail:[email protected] | Jiraphan Sopee(Kasetsart University, Bangkok (Thailand). Faculty of Agriculture. Department of Plant Pathology) | Thapanee Mekmok(Maejo University, Chiang Mai (Thailand). Faculty of Agricultural Production. Department of Plant Protection)
Evaluation on metalaxyl sensitivity of Phytophthora infestans collected from the potato cultivation areas in northern Thailand was conducted on corn A agar. In this investigation, rye A agar can be appropriately substituted by corn A agar with parallel on both characters of fungal growth and metalaxyl sensitivity. Ninety percent of 30 isolates collected from Fang and SanSai districts, Chiang Mai province, and PhobPhra district, Tak province were identified to metalaxyl intermediate isolates. Only 3 isolates collected from Phob Phra district, Tak province and Phrao district, Chiang Mai province were metalaxyl sensitive isolates.
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