Diseases can be tricky to control. Sometimes a plant collapses suddenly and you can't determine the cause. Disease organisms are present everywhere all the time; only when conditions become favorable for them do they go into action. Many soil pathogens, for example, wait for soil that's warm and wet at the same time; they're harmless unless both conditions are present.
The best way to prevent disease outbreaks is to choose resistant plants and then eliminate any conditions that are conducive to problems. These include over- or underwatering; poor soil conditions, such as heavy or badly-draining soil; bad air circulation; and too much shade for sun-loving plants (and vice versa). Diseases will attack stressed plants first.
320 Part Great Greenery for a Green Garden _
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