Mandarin oranges , Citrus reticulata , also known as tangerines, can tolerate a somewhat wider range of temperatures than sweet oranges, and thrive in USDA zones 8b through 11. Here are a five of the most-common: Drought Stress: Insufficient soil water is probably the most-common general cause of curling citrus leaves. and the fruit of tree always has black on them. Navel orange trees produce easy-to-peel seedless fruit on an attractive tree with glossy evergreen leaves. Aphids (mainly Aphis spiraecola) are small flies that are fed with the underside of leaves, often resulting in the curl of citrus leaves.This by itself is not a great damage, because the yield of a citrus tree is generally not greatly affected by the curling of leaves. Orange tree flowers contain 20 to 25 yellow-topped stamens. https://www.nature-and-garden.com/gardening/orange-tree.html The most common citrus leaf problems for lemon, lime and orange tree leaves is leaf drop. Yellowing leaves on orange trees may indicate disease or nutrient deficiency. Ovate-shaped tree leaves can be rounded, elongated, or taper to a point. And while it occurs at any pH, it … Reply. Magnesium is moved from old leaves to new growth and developing fruit, so if there's not enough to go around, the old leaves will show signs first. Orange trees bear clusters of fragrant flowers, each with five oblong petals settled inside of a saucer-shaped calyx, a modified leaf that cups the flower. Prune and trim. Curling leaves are common on citrus trees and may result from one or more causes. P.S.Karunanayake says. March 25, 2019 at 1:39 am. Foliage turns yellow on the edges first, leaving a v-shape of green at the base of the leaf. The petals are long, and each flower has four or five. Orange trees can be heavily affected by insects (mainly aphids) and also by fungal, bacterial and virus diseases. When trying to identify a tree by its leaves, you can also notice the venation patterns on the leaf as well as its color and size. Lemon tree flowers grow singly or in clusters and have only a mild fragrance. This can be caused by any number of reasons, but the most common is a great fluctuation in temperature, causing the leaves falling off a citrus tree to continue to drop until the tree can handle the temperature once more. my orange tree is 2y old and have the same problem as the Pamela need a solution . Other types of orange trees have similar characteristics in terms of general shape, flowers and leaves, but the size of the tree and the fruit are different. Also, the margins of these leaves can be smooth, serrated, notched, or lobed. The same treatments should work for getting rid of citrus leaf curl, whether you have orange trees, mandarin tree lemon trees, lime trees or peach trees. 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