Leek rust

FUngal diseases Black, sunken patches on leaves farleft) are caused by the fungal disease downy mildew. Plok off Infeoted leaves and dispose of them Immediately next year, be sure to rotate crops. Leek rust Heft) need not spell disaster for your orops, but In future years, look for leek oultivars that offer some resistance to this fungal Infeotlon. 

What to do Do not overfeed with nitrogen-rich fertilizers. Use a potassium fertilizer if rust is a regular problem. Improve the drainage of soil if necessary. Use a crop rotation. Grow more resistant leek cultivars such as Poristo and Poribleu. Do not overcrowd seedlings. Clear away and compost any diseased plant debris. 

Cutworms, bean seed fly, onion fly, leek moth and thrips can be a problem in the crop. Rust, foot rot, leaf blotch, white tip and white rot are the main disease problems in leeks. 

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