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Septoria Leaf Blotch, Septoria avenae<br />
Severity Septoria causes leaves, and in severe cases panicles, to turn reddish brown,<br />
reducing visual quality. The spores are splash dispersed and continue to<br />
move up the plant if climatic conditions are conducive.<br />
Source and spread Stubble, wind, rain splash.<br />
Main hosts <strong>Oat</strong>s.<br />
Plant part attacked Leaves and stem.<br />
Symptoms Leaves have dark, elongated spots with a yellow surround.<br />
Entire leaf can die.<br />
Stem can be infected and lodging may result.<br />
Control methods<br />
rotations & Sow partially or resistant varieties resistant varieties.<br />
variety choice Avoid sowing into or near infected stubbles.<br />
Do not grow oats continuously.<br />
time of sowing In high rainfall areas, do not sow early.<br />
stubble Burn or bury infected stubbles.<br />
management<br />
fungicides Propiconazole is a fungicide registered to suppress Septoria in oats.<br />
Withholding periods must be considered.<br />
Other comments Early infections of Septoria can be confused with Pyrenophora leaf blotch.<br />
PRODUCING QUALITY OAT HAY<br />
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