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Preventing plant diseases on farms

Preventative practices can reduce disease pressure on farms

 

Water management

Mulch (either straw or plastic) prevents pathogens from splashing up from the soil when it rains.
Use drip irrigation when possible to add water near the roots of plants without splashing water onto the leaves.
Proper spacing and the use of trellises for to support vertical growth provide better airflow through the canopy.
Grassy walkways between plots can prevent water movement across fields. In areas with slopes, use deep-rooted perennials to absorb water.
Maintain natural bodies of water, and surround them with deep-rooted perennial plants. Avoid surface water for irrigation when possible.

Sanitation

Use clean seed to prevent new pathogens from entering the farm. If using saved seed, treat it with hot water.
Start your days in the youngest, healthiest plants. After working in a field with disease pressure, wash your boots, tools and clothing.
Wash your hands, clothes and shoes. Clean your shoes with high pressure water as you move between fields, and especially after visiting other farms.
High tunnels are high value environments: keep separate tools and boots to use only in tunnels.
Wash your tools and equipment often, especially after working in diseased plots. Make a central washing station that is conveniently located so you remember to use it

Residue management

Rotate the plots where crop families are planted. For example, after planting beans, wait 3 years until you plant beans again in the same spot.
Look for diseased plants at least weekly, and identify all diseases. Once you have a diagnosis, seek resistant varieties the following year.
Keep compost away from fields and make sure it is fully composted before applying back to production fields.
Manage weeds in and around fields; they can serve as hosts for various diseases.
Remove infected plants and their neighbors to prevent the spread of pathogens to healthy plants. Only remove diseased leaves when plants are dry, and no rain is forecasted.

Author: Natalie Hoidal, Extension educator, local foods and vegetable crops

Illustration: Urban Ecosystems & Stardust Interactive

Reviewed in 2021

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