![]() ![]() Unless your soil test report specifically recommends additional phosphorus, use a low- or no-phosphorus fertilizer.Many Minnesota soils have enough phosphorus. Apply phosphorus (P) and potassium (K) according to soil test recommendations.Scientific name of diseases: Early blight, Alternaria solani Late blight, Phytophthora infestans Leaf spot, Septoria lycopersici. Mulch around the base of plants to reduce water splashing.Remove diseased leaves as soon as they appear.Leaf Spot: remove infected leaves as they appear improve air circulation around plants clean tools after using clean plant stakes and cages plant in a different location next year. Late Blight: pull and destroy the plant as soon as you know its late blight select resistant varieties to plant in future plant in a different location next year. Leaf Spot: fruit is usually not affected sunscald may occur as a result of leaf loss above.Įarly Blight: remove lower leaves after first fruit sets then remove affected leaves as they appear plant in a different location next year. Late Blight: spots beneath the skin develop on tops and upper sides of green fruit spots become reddish-brown, firm, dry, leathery spots grow larger the skin wrinkles and darkens to chocolate brown soft rot sets in white mold forms in damp, humid conditions. Late Blight: black and brown lesions appear on stem and petioles when petioles or leaf stalks are affected, entire leaf can collapse entire vine or plant can quickly collapse and die in period of high humidity.Įarly Blight: sunken spots appear on the stem end of fruits concentric ring pattern or target-shape appearance around spots disease moves from stem to rot fruit. Leaves turn slightly yellow, then brown, then wither.Įarly Blight: dark, sunken lesions at or above the soil line, sometimes called collar rot. Disease spreads upwards from oldest to youngest. Leaf Spot: numerous brown spots appear on the leaves 1/16 to 1/4 inch in diameter spots are circular with dark brown margins and tan to gray center–a black speck in the center spots do not have a yellow halo. In humid, wet conditions, a fuzzy ring of mold around spot appears on the undersides of leaves. Late Blight: water-soaked spots show first on lower leaves spots start out pale green diffuse irregular spots on upper side of leaf, usually near the edges of tips of leaves spots turn brown to purplish-black and velvety with pale green border on underside of leaf spots appear on young leaves at the top of the plant spots look water-soaked no concentric rings or defined border around necrotic spots. Large portion of leaf becomes a diffuse yellow and may drop. Leaf Spot: high humidity temperatures between 60° and 80☏.Įarly Blight: symptoms appear first on older, mature leaves near the base of the plant–one or two spots per leaf, spots ¼ to ½ inch in diameter spots have tan centers with concentric rings and yellow halos around the edges, target-shape appearance with defined border spots enlarge and coalesce. ![]() Watch for disease when cool, moist nights are followed by warm, muggy days. Infection often occurs before blossoming. Late Blight: high humidity temperatures between 60° and 80☏ wind-, rain-, and soil-borne. Early Blight: high humidity temperatures above 75☏ transmission hastened by wind, heavy dew, and frequent rain poor plant nutrition contributes. ![]()
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