Don't Crowd Vegetable PlantsAlways try to plant vegetables at recommended distances given on seed packets or plant tags. It may look sparse to start with, but the recommendations keep full-grown plants in a healthy environment with plenty of air circulation, which will protect against many diseases.
Avoid Reusing Potting SoilThis includes dumping soil from containers into a vegetable garden bed. Diseases lurk in the soil and will infect the next plant that is grown in reused potting soil. You can actually sterilize soil by cooking it in the microwave. Cook on high for 90 seconds for every 2.2 pounds of soil. For information on making your own potting soil, check out How To Make Your Own Potting Soil
Clean and Disinfect Garden ToolsGarden tools that are used to care for, prune, or dig up a diseased plant may carry the disease unless they are thoroughly cleaned and disinfected. This will keep the disease from spreading to the next plant the tool comes in contact with. Use a 10% bleach solution or rubbing alcohol.
Keep Vegetable Plant Leaves DryObviously vegetable plants will get wet when it rains, but try to avoid watering overhead. Keeping leaves moist can promote disease such as powdery mildew or blights. It's best to water at the roots if at all possible.
Avoid Walking Through or Working In Wet Vegetable GardensIn a healthy vegetable garden this shouldn't be much of a problem, but if you're fighting a disease on any of your plants, the simple act of moving through the vegetable garden bed and touching first one plant and then another can infect a previously healthy plant. Working in a soggy vegetable garden can also result in damaged root systems.
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