Guide For Tomatoes

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T O M AT O E S As lesions mature, they turn brown and cause general leaf dieback. Disease Cycle Late blight survives on volunteer plants and on abandoned plant material, such as cull piles. Sporangia serve as the primary inoculum and are carried by wind to other plants. Sporangia may germinate directly and infect the plant, or, if temperatures are 54º to 59º F, sporangia may produce zoospores that in turn infect the plant. When conditions are favorable, the disease develops so fast it appears as if the crop has been frost-damaged. Fruit lesions appear as dark olive, greasy spots that may enlarge to cover the whole fruit. L A T E B L I G H T Conditions for Development The disease is most active during cool, moist weather, especially cool nights and warm days. Optimum conditions for sporulation are 91 percent to 100 percent humidity and 64º to 72º F. Optimum temperatures for zoospore formation and germination are 54º to 59º F. Temperatures above 86º F are unfavorable for disease development, although the pathogen can survive. 49
P O W D E R Y M I L D E W 50 Powdery Mildew – Leveillula taurica Symptoms The most commonly seen symptoms of powdery mildew are light green to bright yellow lesions on the upper surface of the leaf. Necrotic spots may develop in their centers. A light powdery layer may cover the lesion on the leaf surface. Heavily infected leaves die but usually do not drop from the plant. T O M AT O E S
Page 1 and 2: Disease Identification Guide For To
Page 3 and 4: T O M AT O E S Syngenta Crop Protec
Page 5 and 6: S E A S O N A L C A L E N D A R 4 D
Page 7 and 8: T R E AT M E N T S Treatments
Page 9 and 10: Actigard Recommendations for Tomato
Page 11 and 12: Bravo Weather Stik Recommendations
Page 13 and 14: The combination of certain environm
Page 15 and 16: Quadris Recommendations for Tomatoe
Page 17 and 18: Quadris Opti Recommendations for To
Page 19 and 20: Revus Top Recommendations for Tomat
Page 21 and 22: Ridomil Gold Bravo SC Recommendatio
Page 23 and 24: Ridomil Gold GR Recommendations for
Page 25 and 26: Ridomil Gold MZ WG Recommendations
Page 27 and 28: Ridomil Gold SL Recommendations for
Page 29 and 30: A N T H R A C N O S E 30 Anthracnos
Page 31 and 32: B A C T E R I A L S P E C K 32 Bact
Page 33 and 34: B A C T E R I A L S P O T 34 Bacter
Page 35 and 36: B L A C K M O L D 36 Black Mold - A
Page 37 and 38: B U C K E Y E R O T 38 Buckeye Rot
Page 39 and 40: D A M P I N G - O F F 40 Damping-of
Page 41 and 42: E A R L Y B L I G H T 42 Early Blig
Page 43 and 44: Gray Leaf Spot - G R A Y L E A F S
Page 45 and 46: G R A Y M O L D 46 Gray Mold - Botr
Page 47: L A T E B L I G H T 48 Late Blight
Page 51 and 52: S E P T O R I A L E A F S P O T 52
Page 53 and 54: S O U T H E R N B L I G H T 54 Sout
Page 55 and 56: T A R G E T S P O T 56 Target Spot
Page 57 and 58: W H I T E M O L D 58 White Mold (Sc
Page 59 and 60: Syngenta Seeds R O G E R S
Page 61 and 62: T O M AT O E S Variety Description
Page 63 and 64: T O M AT O E S Variety Description
Page 65 and 66: Abbreviation Key: Fol: Fusarium wil
Page 67 and 68: T O M AT O E S Syngenta Resources S

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