One by one, your prized tomato plants wilt and die, or clumps of your brightly colored pansies (Viola spp. and cvs., USDA Hardiness Zones 4–8) collapse into scraggly brown mounds. At first, you might assume that your drooping plants have gotten too much or too little water. You also need to consider, however, the strong possibility that pathogens, or disease-inducing microorganisms, are living in your garden’s soil and are now attacking your carefully tended plants.
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