Oats
are a common cereal grain, grown primarily for the seeds. Although we’re
familiar with oats for baked goods and breakfast cereal, their main purpose is
as livestock feed. Like all plants, oats are sometimes affected by various
diseases. While powdery mildew on oats isn’t the worst thing that can happen,
it can markedly diminish crop quality and yield. Unfortunately, there isn’t a
lot that growers can do about the pesky fungal disease.
About Powdery Mildew on Oats
The severity of powdery
mildew outbreaks is dependent on climate, as the disease is favored
by mild, humid weather. It often shows up when temperatures are between 59 and
72 F. (15-22 C.), but may disappear when the weather is dry and temperatures
exceed 77 F. (25 C.).
Powdery mildew spores can overwinter on stubble and
voluntary oats, as well as on volunteer barley and wheat. The spores spread by
rain and can also travel great distances in wind.
Powdery Mildew Symptoms
Powdery mildew of oats appears as fluffy white patches on
the lower leaves and sheaths. As the disease progresses, the cottony patches
develop a gray or brown powder.
Eventually, the area around the patches and the underside of
leaves turn pale yellow, and leaves may die if the outbreak is severe. You may
also notice tiny black spots on oats with powdery mildew. These are the
fruiting bodies (spores).
How to Treat Powdery Mildew
There isn’t much you can do for oats with powdery mildew.
The most important thing is to plant disease-resistant varieties. It also helps
to keep volunteer grains under control, and to manage stubble properly.
Fungicides may be of some help if applied early, before the
disease becomes severe. However, the limited control may not be worth the
expense. Even with fungicide, you aren’t likely to totally eradicate the
disease.
Also, keep in mind that powdery mildew is resistant to some
fungicides. If you’re thinking about using fungicides, talk to the crop experts
at your local
cooperative extension office.
Oats
are a common cereal grain, grown primarily for the seeds. Although we’re
familiar with oats for baked goods and breakfast cereal, their main purpose is
as livestock feed. Like all plants, oats are sometimes affected by various
diseases. While powdery mildew on oats isn’t the worst thing that can happen,
it can markedly diminish crop quality and yield. Unfortunately, there isn’t a
lot that growers can do about the pesky fungal disease.
About Powdery Mildew on Oats
The severity of powdery
mildew outbreaks is dependent on climate, as the disease is favored
by mild, humid weather. It often shows up when temperatures are between 59 and
72 F. (15-22 C.), but may disappear when the weather is dry and temperatures
exceed 77 F. (25 C.).
Powdery mildew spores can overwinter on stubble and
voluntary oats, as well as on volunteer barley and wheat. The spores spread by
rain and can also travel great distances in wind.
Powdery Mildew Symptoms
Powdery mildew of oats appears as fluffy white patches on
the lower leaves and sheaths. As the disease progresses, the cottony patches
develop a gray or brown powder.
Eventually, the area around the patches and the underside of
leaves turn pale yellow, and leaves may die if the outbreak is severe. You may
also notice tiny black spots on oats with powdery mildew. These are the
fruiting bodies (spores).
How to Treat Powdery Mildew
There isn’t much you can do for oats with powdery mildew.
The most important thing is to plant disease-resistant varieties. It also helps
to keep volunteer grains under control, and to manage stubble properly.
Fungicides may be of some help if applied early, before the
disease becomes severe. However, the limited control may not be worth the
expense. Even with fungicide, you aren’t likely to totally eradicate the
disease.
Also, keep in mind that powdery mildew is resistant to some
fungicides. If you’re thinking about using fungicides, talk to the crop experts
at your local
cooperative extension office.