Editing Downy mildew (section)

=== Chemical control ===
Fungicides applied specifically for downy mildew control may be unnecessary. Broad spectrum protectant fungicides such as [[chlorothalonil]], [[mancozeb]], and fixed [[copper]] are at least somewhat effective in protecting against downy mildew infection. Systemic fungicides are labeled for use against [[Cucurbitaceae|cucurbit]] downy mildew, but are recommended only after diagnosis of this disease has been confirmed.<ref name="purdue1"/> In the United States, the [[United States Environmental Protection Agency|Environmental Protection Agency]] has approved [[oxathiapiprolin]] for use against downy mildew.<ref>{{cite web | url = http://www.mda.state.mn.us/chemicals/pesticides/regs/~/media/Files/chemicals/reviews/nair-oxathiapiprolin.pdf | title = Oxathiapiprolin | website = New Active Ingredient Review | date = October 2015 | publisher = Minnesota Department of Agriculture | access-date = 2017-11-09 | archive-date = 2017-11-07 | archive-url = https://web.archive.org/web/20171107025015/http://www.mda.state.mn.us/chemicals/pesticides/regs/~/media/Files/chemicals/reviews/nair-oxathiapiprolin.pdf | url-status = dead }}</ref> In Canada, a mixture of [[zoxamide]] and mancozeb was registered for control of the mildew under the trademark [[Gavel (fungicide)]] as early as 2008.<ref>[https://www.grainews.ca/daily/gowan-buys-dows-gavel-potato-fungicide grainews.ca: "Gowan buys Dow’s Gavel potato fungicide"], 18 Jul 2008</ref>