Despite kale’s tendency to be healthy and vigorous, it can be vulnerable to both diseases and pests under certain conditions.
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Before you can take action, you’ll need to know what’s wrong with your crop. This article will run through the various diseases and pests you might find on your kale.
Diseases include several serious bacterial leaf pathogens, along with a number of fungi that can infect the plants.
Many types of insects can afflict kale, ranging from cabbage butterflies to thrips and flea beetles.
You can help protect your plants by using floating row covers. These covers prevent splashing water – that may contain pathogens – from touching the foliage, and can prevent insects from laying their eggs on crops.
Using heat-treated seed can also protect against certain bacterial pathogens and several diseases. If you cannot buy these types of seeds, you can always treat them yourself (more on this later).
With a bit of diligent care, you can protect your plants from these menaces and have a healthy crop of delectable kale.
Pathogens
A variety of pathogens can assault kale, including a number of fungal diseases, those caused by water molds, a nasty nematode, and three truly frightening types of bacteria.
Fungal diseases
Although rare, most of the fungi that infect kale can be devastating pathogens.
Alternaria leaf spot (Alternaria brassicae, A. brassicicola)
A condition commonly known as “black spot,” these fungi cause small dark spots to form on the leaves. The lesions may look like a target with concentric rings.
This disease is likely to be a problem in warm, moist
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