Late blight, pictured here, can ruin entire tomato crops and cause damage to potatoes. "We noticed that there was a very low incidence of the disease in those that were treated with different concentrations of selenium," Fofana said. "I asked repeat that three times again, because I want to make sure before we… publish that." Fofana was so surprised by the results that he ran the tests more than once. The researchers did their tests in the greenhouse, and in vitro in the lab. But they soon concluded treating only the leaves of the growing plant would be enough. They then wanted to see what impact it could have in preventing disease, starting with late blight.įirst, they soaked potato seeds with a selenium solution before planting them, and sprayed the leaves with it. The researchers added selenium to flax, soybean and potato plants, and noticed positive results. "Our interest was how to increase antioxidant capacity of crops." 'Very surprised' "Working on late blight came, I would say, by accident," said Fofana, a geneticist with Agriculture and Agri-Food Canada. In the past week, numerous new reports of late blight have been made in New York, Ohio, and Pennsylvania ( ).The researchers did their tests in the greenhouse and in the lab. Late blight has been spreading in the Northeast US in recent weeks. Consult the Canadian labels and your organic certifier for registered products that can be used in organic production. Note that crop protection products mentioned in her article relate to US registrations. ![]() Note: Organic producers may be interested in an article by Meg McGrath (Cornell University) on managing late blight in organically-produced tomato. Those in the US can contact their state cooperative extension service or report online at. Please report any occurrences so that we can keep the tomato community informed about its development and spread and so that we can collect samples to learn about the strains, fungicide sensitivity, and the biology of this evolving disease.Ĭontact OMAFRA at 51 or you suspect you have found late blight in Ontario. Past OMAFRA articles on tomato late blight are found under the late blight tag to the right. ![]() Zampro – two active ingredients – protectant and systemic, translaminar – can move into the plant.Tanos 50 DF – translaminar, some “kickback” activity – have some ability to move into the plant – can add to the fungicide program, but rotate chemistries and use in combination with protectants for resistance management.Revus – translaminar, some “kickback” activity – have some ability to move into the plant – can add to the fungicide program, but rotate chemistries and use in combination with protectants for resistance management.Reason 500 SC – locally systemic and translaminar – has some ability to move into the plant – must be tank-mixed with mancozeb or Bravo 500.Ranman 400SC or Torrent 400SC – protectant, locally systemic – should be tank-mixed with a non-ionic or organosilicone surfactant.Presidio – translaminar, some “kickback” activity – registered (in tank mix with Bravo), but note that after using it, rotation to any crop except brassica (head and stem), bulb vegetables, cucurbit vegetables, fruiting vegetables, leafy vegetables (except brassica), root and tuber vegetables (except carrot and sugar beet) is prohibited.Cabrio EG – translaminar – has some ability to move into the plant – strobilurins generally rated lower than the other targetted late blight materials by researchers. ![]()
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