Related Reading 12 Tomato Growth Hacks for a High Yield HarvestĮxposure to higher temperatures and sunlight quickly kills exposed spores spores die in just an hour when exposed to sunlight but can survive for several hours when conditions are cloudy, which gives them more time to infect the plant. When leaves stay wet for more than 10 hours and temperatures stay in the 60 to 70 degree Fahrenheit range (15 to 21 C), late blight takes hold. It requires cool temperatures and high humidity, and prolonged wetness. The disease takes hold when conditions are right. Late blight spreads from spores carried in the wind or from infected plants in the garden. Late Blight in Tomatoes Late blight is bad news for tomatoes, but if the weather is cooperative, it is not likely to occur for some time. It helps to know the basics of how tomato blight starts and spreads so you understand how to prevent it and how to manage it if blight does start. Prevention is important, and management is essential to protect your plants, their fruit, and your potential harvest. It is critical that you have an awareness of the potential for blight to develop and that you know what to look for, hopefully before the disease ever starts. Tomato blights can affect the productivity of the plant, can damage fruit, cause fruit to drop or fail to develop, render tomatoes inedible, or they can kill the plant entirely. Products to Treat Tomato Blight DiseasesĪ Basic Understanding of Tomato Blight Disease If you know when and what to look for in terms of signs of blight, you'll be able to act earlier.A Note About Blight, Fertilization, and Soil Nitrogen.Tips to Prevent and Stop the Spread of Tomato Blights.To What Extent Can We Manage Tomato Blight Diseases?.Early Tomato Blight and Septoria Leaf Spot.A Basic Understanding of Tomato Blight Disease.The products recommended will treat all three types of this disease-so if in doubt, don’t worry! Jump to: So, the tips and advice given here is a good plan to cover all types of blight and give you the best chance of success in your tomato patch. While there are differences between the three, all are fungal diseases that are spread by spores when weather conditions are favorable. (See the link in the summary for a link to a photo-ID pdf that helps identify and spot the differences between the types of blight and leaf spot.) You may also notice yellowing and dead, drying, fragile leaf and stem material, along with other symptoms. The appearance differs depending on which type or types of blight your tomatoes are infected with. Some will appear as a sort of bullseye target with concentric rings. Some will appear as large brown areas (depending on the age and stage of infection). They may start small and as only a few spots but will rapidly spread if left unchecked. Tomato blights are characterized by spots or lesions that range in color from tan to nearly black. We can take action to slow or practically stop blight and still yield a good harvest. Blight is the bane of a tomato gardener's existence. These include early blight, late blight, and Septoria leaf spot. There are three major types of tomato blight.
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