Chlorosis is a plant condition where green plants lose their colors due to lower chlorophyll level, leading to the plant becoming unhealthy, yellow and pale. Nutrient deficiency, mainly of nitrogen, iron, magnesium, manganese, potassium and copper, lack of proper sunlight and certain viral attacks make it difficult to produce chlorophyll. Furthermore, numerous unfavorable environmental factors, including an excess or deficiency of water, toxic substances such as sulfur dioxide cause chlorosis. The condition is also caused by geetic factors. Chlorotic condition leaves plant open to pathogen attacks. Symptoms of chlorosis are seen as even or uneven pale-green or yellow-green coloration of the foliage.