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Crown Rot, Fusarium pseudograminearum, Fusarium culmorum<br />
Severity <strong>Oat</strong>s are susceptible but tolerant so do not display any symptoms of this<br />
disease; however, they can result in a small carryover of inoculum.<br />
Source and spread Soil, stubble.<br />
Main hosts Wheat, barley, oats, triticale, barley grass, other grass weeds.<br />
Other comments Crown rot only needs to be considered in the terms of the whole rotation.<br />
Most commonly observed to cause severe damage following dry conditions<br />
in spring.<br />
Initial infection of plants is favoured by wet conditions, but the fungus<br />
grows rapidly when plants are moisture stressed.<br />
Damage may occur on all soil types, but is more severe on heavy soils.<br />
Image 4.1 Severe Septoria infection in a susceptible oat variety grown in WA.<br />
38 PRODUCING QUALITY OAT HAY
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