tag:blogger.com,1999:blog-7758013995487504560.post1694192284312252395..comments2023-06-06T08:24:37.632-04:00Comments on Virginia Grape Disease Updates: Disease risks from yesterday's rainMizuho Nitahttp://www.blogger.com/profile/10877092875033606750noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-7758013995487504560.post-26854273077797408972012-04-20T08:49:22.573-04:002012-04-20T08:49:22.573-04:00Since none of the materials we have have activity ...Since none of the materials we have have activity after the infection on Phomopsis, it is probably better to go with mancozeb products. <br /><br />We had a several rain events that are warm enough for black rot, thus I will keep eye on black rot development too. It typically take about 2-3 weeks for black rot to develop symptoms. Once you start seeing black rot, and if you are expecting (or experienced) a warm rain event, then I would recommend to add a DMI to your schedule. <br /><br />Note: it is probably not worth adding a DMI at this point because in typical year, black rot appears later in the season, exception is the case where you had an outbreak of black rot last year, and know that there are many inoculum available. Even with that, adding a DMI at this early in the season make your season-long spray program (i.e., rotation of mode of action) more difficult. Thus, I would proceed with caution.Mizuho Nitahttps://www.blogger.com/profile/10877092875033606750noreply@blogger.comtag:blogger.com,1999:blog-7758013995487504560.post-83384466281844801202012-04-19T11:24:03.295-04:002012-04-19T11:24:03.295-04:00Whats the best thing to spray at this point if you...Whats the best thing to spray at this point if you haven't done your first spray yet. Should you still go with Mancozeb?Anonymousnoreply@blogger.com