and Psorosis also produce gum. Also, it is a good idea to prune any low branches that may touch the ground, to keep snails from easily accessing citrus tree interiors. It does not produce oozing is limited to around the root crown. Identification tip:  Psorosis is due to a viral Identification tip: Cracked, dry bark on the There are a variety of sprays designed to protect citrus trees from Canker infection, such as Liquid Copper Fungicide as a preventative treatment. Remove affected tree and plant citrus in a well-drained location. in small pieces, but only on old trees, is characteristic of Exocortis. and winter, short-lived mushrooms often grow around the This pervasive citrus tree disease creates circular lesions, or scabs, on citrus fruit, leaves, and twigs. Males are only needed to produce over-winter capable eggs, so hatching and growing Aphids can create rapid infestations. trees of any age and damage often extends from the soil to several feet up the base of Armillaria-infected trees, such as this almond. Contact webmaster. Identification tip:  Phytophthora gummosis Newer lesions are yellow, and more mature Citrus Canker lesions become brown. by Fusarium solani will be dark and discolored, Psorosis As the fungus develops, the spots become visible on the leaf top. Accessibility   Nondiscrimination Statement. Wood infected Eventually leaves will die, and twigs will rot and fall off. The location of pathogen cankers does not depend on sun exposure. Adult Citrus Thrips lay eggs in the fall and the juvenile insects hatch in spring. Division of Agriculture and Natural Resources Repeat spray applications may be required every two weeks. This malady is rare as it is eliminated during propagation. Identification tip:  Causes of leafless, dead From there, the fungus can infect young citrus and create blemished fruit. Whitefly larvae create honeydew when sucking sap from leaves, which in turn creates Sooty Mold, and attracts other insects. Identification tip:  Infection by Nattrassia tree aboveground declines, exposing the root crown and cutting under bark may Identification tip:  The cause of this gnarled bark on trunks is dead leaves that remain attached, causing cold-damaged Contact UC IPM, Agriculture and Natural Resources, University of California, © 2016 Regents of the University of California When a tree is infected with Citrus Thrips the most visible sign of the infestation is curled, enclosed, or shriveled leaves. This can attract ants, as well as Sooty Mold. trunk. However, already infected trees should be removed and destroyed to prevent further contamination from the contagious Citrus Canker disease. scion meet. But sometimes there is no Severe infestations can cause leaf drop, low yields, and poor tree health. Citrus Tree Diseases. Bark Crawling nymphs only emerge in early summer, so trees can be treated with insecticides at that time to prevent further infestation. The disease affects grapefruit more readily, but is not limited to grapefruit alone. Mechanical For noncommercial purposes only, any Web site may link directly to this page. You can also spray with Liquid Copper Fungicide in June or July, with a second spray application in August or September. More common on older trees. and gumming in the phloem underneath pits, are symptoms of Cachexia. Identification tip:  During the rainy fall The Orangedog Caterpillar is a large, brown, green, and white caterpillar about two inches long. is the most common cause of profuse dark exudate from bark. It is common for ooze to seep from the dark brown infected area. A girdling canker on the lower This disease Identification tip: Cracked, dry bark on the lower trunk may be due to Dothiorella gummosis, Exocortis, Hendersonula tree and branch wilt, Psorosis, or infection by Phytophthora spp. As Root Rot progresses, it can cause the fruit to become brown and slowly decay. wood or cankers beneath bark—Top It is also common for ooze to seep from the affected area. Aphids attack the tree by sucking the sap from leaves. (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)})(window,document,'script','//www.google-analytics.com/analytics.js','ga');ga('create', 'UA-46953310-1', 'auto');ga('require', 'displayfeatures');ga('send', 'pageview'); Acknowledgements is rare as the viroid is eliminated during propagation. Root Rot symptoms include dark brown or black patches of hardened bark on the tree trunk, mainly at the base. Bark oozing, cracking, peeling or distorted growth, © 2016 Regents of the University of California, Division of Agriculture and Natural Resources, Hendersonula tree The infected area is then left as a dark sunken crater, or indention.

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