Chlorosis Symptoms - Leaves are light green or medium green with chlorotic edges. Control - Increase fertilizer level or decrease light intensity if blooming is satisfactory. Also, check to be sure micronutrients were included in the potting medium or are included in the fertilizer program. Sometimes different cultivars grown side by side will have one with superb quality and another with off color because of different nutritional or light requirements. Leaf spotting Symptoms - Primarily circular shaped spots which are light yellow or green appear on the upper surface of leaves.
Spots can appear on margins or blades and are sometimes irregular or donut-shaped and white.
Control - Water that is colder than the leaf surface will cause spotting and is most common in Florida during winter. Deep well water is usually near 70 F and rarely causes problems, except when it is stored outdoors in tanks. Be sure temperatures of overhead water applications are near leaf surface temperatures. Long petioles Symptoms - Leaves appear on extended petioles which give the plant an undesirable shape. Control - Long petioles are usually caused by low light, medium high fertilizer rate and optimum irrigation level.