You may know that many plants don’t grow well – or at all – under walnut trees. This fact has been observed and documented since the first century AD.But what about pecan trees? Do they h
12.06.2023 - 00:59 / gardenerspath.com / Helga George
How to Identify and Treat Alternaria Leaf Spot on Turnips Alternaria brassicicola / brassicaeTwo species of the fungus Alternaria, A. brassicicola and A. brassicae, can cause leaf spot on turnips.
You will know that you have Alternaria leaf spots on your turnip or rutubaga leaves when they develop yellow to black leaf spots with concentric rings like a target.
This disease is mostly cosmetic and will not destroy your turnips. However, if you try to sell them, consumers and retailers will probably avoid buying from you if they have these symptoms.
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Your options for controlling this disease vary depending on what part of the country you live in. States vary in the number and types of fungicides that you can use to control Alternaria leaf spot on crucifers.
However, there are a number of cultural controls that you can use and two microbial fungicides that can suppress this disease.
Read on for more information about Alternaria leaf spot of turnip and control methods.
Alternaria Leaf Spot SymptomsThe most common symptom is circular leaf spots on the turnip leaves. The spots start out yellow and then can become tan or black. They have concentric rings like a target.
The centers of the lesions can fall out, and the spots can blend together to form large regions of dead tissue.
The turnip plants can also develop lesions on the seedpods, flowers, flower pedicels, stems, and petioles.
Life CycleAlternaria survives outside of the plant – typically on debris from diseased crops. This fungus is likely to spread when the weather is warm (60-78 F) and moist, for example, 90% relative humidity for at least 12 hours.
The fungi produce
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