Fire blight treatment1/30/2024 He recommends applying Blossom Protect right after the second round of lime sulfur. Lime sulfur kills bacteria, but it also kills yeast. Lime sulfur and Blossom Protect have a tricky dynamic. After early lime sulfur sprays for thinning, make sure to apply Blossom Protect (Aureobasidium pullulans). He has been telling applicators and conventional growers the same thing.Īs for when to start, he recommends applying 5 pounds to 6 pounds per acre of fixed copper just prior to green tip.Įarly during bloom, his research has found that lime sulfur sprays used to thin flowers also suppress fire blight. “So, I’ve been trying to get people to extend their programs, and I think it makes a difference in fire blight control,” he said. In one old Bartlett block, his inoculum count jumped from 200 cells per flower at petal fall to over 1 million cells per flower a week later.Įventually, the tree will reach a point at which sprays will do no good, but researchers are uncertain exactly when that point is. In most of his trials in Corvallis, Oregon, he has found the highest populations a week after petal fall, when flowers are all but gone. In fact, that was one of his main messages: Continue spraying a week past petal fall, especially if temperatures spike. Instead, organic growers must follow a season-long, phenology-based program of copper sprays, lime sulfur and Bacillus-based biorationals that lasts through petal fall, and beyond. And even those that do work may cause russeting in certain varieties. (TJ Mullinax/Good Fruit Grower)įirst, his disclaimer: Antibiotics are not allowed on organic fruit and none of the organic alternatives work as well, he said. Ken Johnson, Oregon State University, speaks during the Organic Controls that Work panel at the Washington State Tree Fruit Association’s annual meeting in December 2018 in Yakima, Washington.
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