12/26/2023 0 Comments Tomato blight ontarioCabrio EG – translaminar – has some ability to move into the plant – strobilurins generally rated lower than the other targetted late blight materials by researchers.Acrobat 50 WP – translaminar – has some ability to move into the plant – must be tank-mixed with another late blight fungicide from a different chemical family – can add to the fungicide program, but rotate chemistries.mancozeb (Manzate, Dithane), metiram (Polyram) – contact fungicides – have been very effective protectants in tomato.chlorothalonil (Bravo, Echo) – contact fungicides – have been very effective protectants in tomato. See the Tomato Late Blight Photo Gallery and refer to Late Blight Look-Alikes for photos of late blight and possible look-alikes on tomato. If the weather conditions become dry, the spray intervals may be extended. Tighten up spray intervals – During wet cool periods, a fungicide should be applied every 5 – 7 days to protect against late blight.The disease is suppressed by hot, dry weather, but it can continue developing and spreading when suitable conditions return. Cloudy and high humidity or wet conditions are favourable for late blight. Remember that conventional tomato growers using a recommended fungicide program for early blight, septoria leaf spot, and anthracnose, are also protecting the crop from late blight infection, but once it is in the area, consider shortening spray intervals and choose products with good late blight activity (see below). Commercial tomato growers across Ontario should ensure they have a protective fungicide program on their plants and should monitor the crop closely. F or information on registered tomato fungicides for Ontario, s ee OMAFRA’s Vegetable Crop Protection Guide and 2016 supplement (get the pdf by contacting OMAFRA’s contact centre at 1-87 or Always read and understand the label before using any crop protection product.OMAF & MRA have now confirmed late blight in the Region of Waterloo, Wellington County, Lambton County, Brant County, and additional sites in Chatham-Kent. Keep in mind that the efficacy ratings linked above are US sources and not all of the products are registered in Canada, or registered on late blight of field tomato. If you didn’t find the product information you were looking for, check out the fungicide efficacy ratings from other locations: Wisconsin (late blight), New York (late blight), New York (late blight, early blight), Georgia (various tomato diseases). Therefore, it is not possible to include observations on product consistency in ratings. Ratings represent results of only one efficacy trial when disease pressure was high. Septoria leaf spot pressure is inconsistent at the Ridgetown Campus, University of Guelph. Early blight disease pressure is inconsistent at the Ridgetown Campus, University of Guelph.Only data from trials with high disease pressure were considered in developing these ratings. Fungicide trials for anthracnose management are completed on a regular basis at the Ridgetown Campus, University of Guelph.Tom Zitter oxathiapiprolin provided very good (+++) control when applied in rotation with ++ rated fungicides in a trial in Pennsylvania. Orondis Ultra (Group U15 + 40, oxathiapiprolin + mandipropamid): mandipropamid is rated ++ by Dr. Tom Zitter Zampro was equivalent to programs using ++ and +++ rated fungicides in a trial in Pennsylvania.
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