Copper deficiency has not been observed on sugar beets in the field, nor is it easily produced on sugar beets in nutrient solutions. Apparently, only minute amounts of copper are required for growth, since in nutrient solutions deficiency symptoms cannot be pro duced without using repurified salts and redistilled water. Under these conditions sugar beet plants develop first a mild chlorosis of the young, center leaves similar to that of iron, chlorine, and manganese deficiency. Chlorosis due to nitrogen, sulfur, and molybdenum deficiencies, however, tends to cause an overall yellowing of the plant. In the case of copper, deficiency symptoms progress from the mild chlorosis to a fine, green, netted veining after which the blade tissues become bleached. This bleaching differs from the spotted necrosis that results from iron deficiency, or black spotting from manganese deficiency, or the raised veining of chlorine deficiency.