{"id":1064,"date":"2017-03-13T13:49:52","date_gmt":"2017-03-13T20:49:52","guid":{"rendered":"https:\/\/extension.wsu.edu\/wam\/?page_id=1064"},"modified":"2024-11-22T14:51:50","modified_gmt":"2024-11-22T22:51:50","slug":"fungicide-sensitivity-of-phytophthora-rubi","status":"publish","type":"post","link":"https:\/\/extension.wsu.edu\/wam\/2017\/03\/13\/fungicide-sensitivity-of-phytophthora-rubi\/","title":{"rendered":"[Archived]: Fungicide Sensitivity of Phytophthora Rubi From Washington Red Raspberry Production Fields"},"content":{"rendered":"

[row][column][textblock]<\/p>\n

Volume 5 Issue 10<\/strong><\/p>\n

Jerry Weiland, USDA-ARS Plant Pathologist<\/strong>
\nEmail: Jerry.Weiland@ars.usda.gov<\/a>[\/textblock][\/column][\/row][row][column][textblock]<\/p>\n

PRELIMINARY RESULTS FOR RIDOMIL (MEFENOXAM)<\/h2>\n
    \n
  • Stewart et al. 2014<\/span> reported four Washington P. rubi<\/span> isolates from 4 fields were sensitive to mefenoxam (0.062 \u00b5g\/ml).<\/li>\n
  • 2015<\/span>: Assessed 112 Washington P. rubi <\/span>isolates, including Stewart’s four isolates, from a total of 22 fields.\n
      \n
    • The majority of isolates are sensitive (0.118 \u00b5g\/ml).<\/li>\n
    • One isolate was highly resistant (199 \u00b5g\/ml). One isolate was moderately resistant (52 \u00b5g\/ml). A few isolates might have low resistance (3 \u00b5g\/ml), but need retesting.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

      [\/textblock][textblock]<\/p>\n

      Figure 1.<\/strong> Sensitivity of P. rubi<\/em> isolates from Washington to mefenoxam.<\/figcaption><\/figure>\n

      [\/textblock][textblock]<\/p>\n

        \n
      • 2016 in progress<\/span>: Approximately 60 new Washington P. rubi<\/span> isolates from 6 new fields. Also resampled the field where the highly resistant isolate was collected.<\/li>\n
      • Total<\/span>: 28 fields from 5 counties surveyed: Whatcom (18 fields), Skagit (5 fields), Clark (3 fields), Cowlitz (1 field), and Puyallup (1 field).<\/li>\n
      • Conclusions<\/span>:\n
          \n
        • Resistance to mefenoxam does not appear to be a problem at this time. The majority of WashingtonP. rubi<\/span> isolates are sensitive to mefenoxam, the active ingredient of Ridomil.<\/li>\n<\/ul>\n<\/li>\n
        • Recommendation<\/span>: Continue switching between fungicide chemistries (e.g., mefenoxam and phosphorous acid) to prevent the development and spread of fungicide resistance.<\/li>\n<\/ul>\n

          Reference<\/span>:
          \nStewart, J. E., Kroese, D., Tabima, J. F., Larsen, M. M., Fieland, V. J., Press, C. M., Zasada, I. A., and Gr\u00fcnwald, N. J. 2014. Pathogenicity, fungicide resistance, and genetic variability of Phytophthora rubi<\/span> isolates collected from raspberry (Rubus idaeus<\/span>) in the Western United States. Plant Dis. 98:1702-1708.[\/textblock][\/column][\/row]<\/p>\n","protected":false},"excerpt":{"rendered":"

          Volume 5 Issue 10 Jerry Weiland, USDA-ARS Plant Pathologist Email: Jerry.Weiland@ars.usda.gov PRELIMINARY RESULTS FOR RIDOMIL (MEFENOXAM) Stewart et al. 2014\u00a0reported four Washington\u00a0P. rubi\u00a0isolates from 4 fields were sensitive to mefenoxam (0.062 \u00b5g\/ml). 2015:\u00a0Assessed 112 Washington\u00a0P. rubi\u00a0isolates, including Stewart’s four isolates, from a total of 22 fields. The majority of isolates are sensitive (0.118 \u00b5g\/ml). One…<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_external_link":"","_expiration_date":""},"categories":[6,21],"tags":[],"_links":{"self":[{"href":"https:\/\/extension.wsu.edu\/wam\/wp-json\/wp\/v2\/posts\/1064"}],"collection":[{"href":"https:\/\/extension.wsu.edu\/wam\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/extension.wsu.edu\/wam\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/extension.wsu.edu\/wam\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/extension.wsu.edu\/wam\/wp-json\/wp\/v2\/comments?post=1064"}],"version-history":[{"count":2,"href":"https:\/\/extension.wsu.edu\/wam\/wp-json\/wp\/v2\/posts\/1064\/revisions"}],"predecessor-version":[{"id":5704,"href":"https:\/\/extension.wsu.edu\/wam\/wp-json\/wp\/v2\/posts\/1064\/revisions\/5704"}],"wp:attachment":[{"href":"https:\/\/extension.wsu.edu\/wam\/wp-json\/wp\/v2\/media?parent=1064"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/extension.wsu.edu\/wam\/wp-json\/wp\/v2\/categories?post=1064"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/extension.wsu.edu\/wam\/wp-json\/wp\/v2\/tags?post=1064"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}