Forking in carrots Introduction A disease in plants can be defined as any disturbance brought about by an agency/factor which interferes with manufacture, translocation or utilization of food, mineral nutrients and water in such a way that the affected plant changes in appearance and or yields less than a normal, healthy plant of the same variety . Causes of Plant Diseases Plant diseases are of two types viz., infectious and non-infectious . The infectious type are caused by fungi, bacteria and viruses. Nutritional deficiencies, mineral toxicities, lack or excess of soil moisture and light, low or too high temperatures, soil acidity or alkalinity constitute the non-infectious type. Usually, a disease causes a progressive and continuous disturbance of cellular activities that eventually become manifest as symptoms. A symptom is a visible or otherwise detectable abnormality arising from disease. Disease symptoms should be closely observed, as they often give indications about
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