![]() ![]() Infected weeds may contribute to further spread. The organism may attack other solanaceous plants as well, including hairy nightshade ( Solanum physalifolium), and petunias grown in greenhouses. But if the weather will remain wet for a while, it is better to destroy the plants immediately than to wait for a dry day.Īs described above, potatoes are also highly vulnerable to late blight. Ideally, you should destroy the plants on a dry, sunny day, so the spores will die quickly. Dig them up in their entirety, till them under, or cut them off at the soil line and immediately bag them, so the spores will not spread. If you find evidence of late blight that is already severe, remove and destroy the diseased plants immediately. But remember that this disease spreads rapidly under suitable conditions, and there is no cure. I’ll cover how to determine whether this is a viable option a little later in the article. However, the oomycete keeps evolving and overcoming these traits in various hybrid varieties bred for resistance. In an ideal world, your best option would be to grow tomatoes that are resistant to late blight. USABlight, an online portal created at North Carolina State University, allows registered users to check for reports of infection in their local area, and you can report local disease occurrences or find information to submit samples for testing there as well. Instances of this disease are monitored in local regions, and alerts may be available to growers when favorable conditions are in the forecast. If you identify late blight, notify your county extension agent.
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