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The majority of plant illnesses are caused by organisms that are biotic, or alive. Many different organisms, including fungi, bacteria, phytoplasmas, viruses and viroids, nematodes, and parasitic higher plants, are responsible for the majority of plant illnesses. Disorders that are induced by abiotic causes are not contagious in nature. There are almost an infinite number of factors that can bring about a disorder; however, the majority of disorders are brought on by a handful of factors, including extremes in temperature, moisture, light, nutrient levels, poor soil (acidity or alkalinity,...