Begin with good soil preparation and proper seed selection. If you transplant, picking healthy plants will keep disease from being introduced and spread. Remove any diseased plant before it can infect others nearby.

Water at appropriate times, usually early in the day. That gives the leaves a chance to dry before nighttime temperatures set in. Watering practices can influence the spread of disease in other ways. Water splashed off one plant onto another exposes the ones nearby to any disease the first carries. It's similar to being near a person with a cold who sneezes into the air. Even rainfall will produce the same effect to some degree. Space your plants out.

Also, viruses can be spread by insects who carry them from one plant to the next. Controlling the insect population benefits you exponentially. There are also ways that gardeners and animals can spread disease. Gardeners gloves and the legs of rabbits can carry tobacco mosaic virus, for example.

Keeping the garden well weeded will lower the prospect of disease. Keeping the area attractive turns out to have health benefits, as well. Many organisms thrive on weeds, then move onto your vegetables. They can be carried by wind, insect, water movement and other means.

Controlling various disease can be helped if you are able to identify the signs of these diseases.

When the out edges of lettuce touch the ground, lettuce mold can appear as a wet rot. The Sclerotinia mold is white and Botrytis mold is gray. The problem can be contained by removing the mold by extracting infected sections, or an entire plant.

Leafy vegetables commonly encounter spinach mosaic virus as well. In this case, leaves become mottled, and may later turn yellow. The plant appears wilted and stunted. Choosing resistant varieties can eliminate this problem altogether.

Fusarium can cause asparagus to wilt or rot. The spears look spindly and shoots may become yellow. The roots may rot and become discolored. Eliminate the infected plants by thinning the crop. Another common problem with asparagus is rust, cause by Puccinia fungus. Red spots appear on the shoots of spears. This fungus may survive through the winter. Prevent rust by avoiding excessive watering.

Other conditions that affect tomatoes are leaf spots and blight. If the summer has been cool, these will usually appear by mid-August. There are also fungi in the soil that can affect tomatoes. The roots of walnut trees can carry a harmful toxin to tomato plants. Dark concentric rings will appear on leaves with this condition. Allowing the leaves to dry before sunset will help you prevent these problems.

You will optimize your chances of a healthy, abundant crop if you can recognize and treat the signs of disease in the early stages.