Healthy sago leaves are a deep green. Mediterranean-climate gardeners with a yearning for the exotic hit pay dirt with sago palms (Cycas revoluta). But scale and spider mites can become problematic. When sago palms lack manganese, the newest leaves will develop yellow splotches or be entirely yellow. While sago palms (Cycas revoluta) might look innocuous and inviting, the hardy plants are highly poisonous to both human beings and pets. Sago palms don't have serious issues with pests or diseases. • Sago palms are the most widely propagated cycad in the world • A male and a female are required for pollination and production of seeds Reproductive Process • Male plants produce something that resembles a yellow to tan-colored pine cone up to 2 feet long. Corona, CA. If you notice your sago leaves turning yellow, the plant may be suffering from nutrient deficiencies. The sago palm (Cycas revoluta) is one of the oldest species of plants, having appeared on the earth about 260 million years ago, according to the Florida Museum of Natural History. Look out for foliage damage or discoloration, as well as tiny bugs along the fronds. There are more than 200 cycad species. Sago Palm Disease - Knowledgebase Question. 0. As the leaves die, they turn brown and take on a frizzled appearance. The sago palm is really a cycad (an evergreen seed plant), not a palm. Sago palms grow in U.S. Department of Agriculture plant hardiness zones 9 through 10. I you find white scale on your sago palm, prune the plant and treat with horticultural oils. Their tropical look and ability to survive in many different environments makes them a popular choice. Sago Palms are very tough plants, but sometimes the leaves can turn yellow or brown, and many things can cause this to happen. Trees. The sago palm commonly grows in the southern region of the United States. Sago palm. Sometimes the leaves or fruit may be smaller than normal. The tree can grow anywhere from 20 to 32 feet and provides the starch sago, which is a major ingredient in the noodles and breads for the people of New Guinea. What Are the Pests of Sago Palms?. Misleading common names like "sago palm" further the confusion. Collar, foot, root and crown rots caused by species of the fungus Phytophthora can infect sago palms as well as standard palm trees. This sago palm is suffering from a classic case of manganese deficiency. Until now, there has not been a way to get rid of the white scale on Sago Palms, a very small bug with a very hard shell. Cycads are often mistaken for palms, but are in fact only distantly related. (|The Times-Picayune archive) Question: My sago palms … Answer from NGA January 1, 2004. False oleander scales occur wherever sagos grow in U.S. Department of Agriculture plant hardiness zones 9 through 11. If left unchecked, the sago usually dies. It has rough trunks and crowns of fern-like leaves. This is known botanically as a microsporophyll but is commonly referred Sago palms look like palm trees, but they are not true palm trees.They are cycads, a type of plant with a unique reproductive process somewhat like that of ferns.Sago palm plants live many years and grow quite slowly. Common Pests and Diseases . Finding scale insects on your sago palms (Cycas revoluta) is no laughing matter, so you want to learn how to treat scale on sago palms quickly.The false oleander scale and the Asian cycad scale both feed on the sap of sago palms. Question by arndel42580 January 1, 2004. Cycads have several uses, from in containers in living rooms to shrub borders outdoors. What would cause a sago palm to develop yellowing on it's leaves?