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How do plants get diseases?

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Plants get diseases in very similar ways to human beings. Many human diseases are caused by very tiny living creatures. We will call these creatures "disease organisms." Some disease organisms enter the human body and infect it with a particular disease. Other disease organisms can also enter plants and infect them with diseases. There are four major types of disease organisms which cause plant disease. They are: fungi, bacteria, viruses, and nematodes. These disease organisms are usually carried from one plant to another by insects or by the wind. Disease organisms need several things in order to grow and breed. They need plants to feed on, they need a certain temperature, and they need the right amount of moisture. Many disease organisms are most active and infect more crops when their surroundings are warm and damp. Plants are like people in another way, too. People need good food and water to grow strong. So do plants. If your soil has lots of nutrients, and your plants have ... more
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