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Phytophthora fungi are present in almost all citrus orchards. Under moist conditions, the fungi produce large numbers of motile zoospores, which are splashed. The main symptom of citrus gummosis is oozing of gum from the affected parts on the trunk. Infected bark remains firm with small, longitudinal cracks through. Gummosis is the formation of patches of a gummy substance on the surface of certain plants, particularly fruit trees. This occurs when sap oozes from wounds or .

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Fumigate only as a last resort when other management strategies have not been successful or are not available. Extensive Phytophthora foot rot lesion showing bark death and tissue callusing on a tree.

Lesions usually occur on the bark or at the bud union. Disease assessment In each orchard, 30 trees were selected and a gummosis incidence was assessed. Citrus trees will produce an amber color gum as a defense against the invasion.

In ascending order, Cleopatra mandarin, Sour orange, rough lemon, Rangpur lime, Carrizo, Troyer are tolerant to root gummossi. Inject 7—9 inches, 12—18 inches apart, and tarp immediately. Phytophthora foot rot of sweet orange tree showing bark necrosis, light gumming, and callusing.

It should be noted that: The diseased bark will be near the gumming and will be discolored brown. Results showed that growth and fruit production are greatly reduced on trees infected by gummosiz disease.

Foot Rot or Gummosis Diseases of Citrus

Few studies have suggested a citfus mechanism of gummosis occurrence on citrus tree and as a cause of for citrus decline elsewhere in the world much work was not done in Ethiopia thus far on gummosis. Contact Us – Report a Bad Link. Infections of tree parts Gummosis was more frequent on scions trunk and branch Hence, there is a need to undertake coordinated and multi-phased research investigations on possible causes of citrus decline and find a sustainable, eco-friendly and easily commercialized technology that fits for our subsistence agriculture system.


If these lesions are discovered early, the fungus can be stopped and the tree saved.

Garden Guy Hawaii: Citrus Gummosis

July 17, Published: Is gummosis becoming more of a problem? Cracked lesions that exude sap are found on infected scions, which become gradually girdled and killed. When establishing a new orchard, carefully check the lower trunk and rootstock of new trees for any symptoms of gummosis before you plant. Can also be used as a protectant on trees where risk of gummosis is high.

Citrus gummosis | Plantwise

Among these citrus gummosis is one of the most important biotic constraints in the country. Correcting any soil or water problems is essential for a recovery.

Lesions may exude copious amount of gum and a brown necrotic area will be found under the bark lesions. Phytophthora nicotianae Breda de Haan var. PDF Add to factsheet booklet. Morphological aspects of isolates were used in accordance with the descriptions made by Drenth and Sendall [ 18 ] Figure 3.

Spray or paint on trunk when disease occurs or conditions favor disease development. Plant Disease Management Reports. Similarly Jagtap et al. Secondary infections often occur through lesions created by Phytophthora. Abstract Citrus production in Ethiopia is threatened by a number of biotic and abiotic factors.

Why do citrus trees have, in general, an unhealthy appearance? Use low rate on citeus loam and high rate on heavier soils or high clay.

Branches with this symptom resulted in die back of a tree that could not keep their fruits and leaves alive for the next season. Clay nature gummosix the citrus orchard and optimum temperature for the development of the spores of the pathogen as well as weak management of the orchards made the disease highly sever in the area. Can be applied up to 3 times per year, but do not make soil and trunk applications of mefenoxam to the same tree during the same cropping season and do not apply more than 1.


When using a pesticide, always wear protective clothing and follow the instructions on the product label, such as dosage, timing of application, and pre-harvest interval.

Visit for more related articles at Journal of Horticulture. Under moist conditions, the fungi produce large numbers of motile zoospores, which are splashed onto the tree trunks. Pure cultures of Phytophthora spp. The average minimum and maximum annual temperature were During the summer, gum deposits dry and stick to the bark, making the symptoms of yummosis very noticeable.

Citrus Diseases March, idtools.

Infection may occur from soil or nursery plants due to extended periods of moist and wet conditions. Copyright is not claimed for material provided by United States government employees as part of their work.

Under favorable conditions high moisture and temperature it produces large numbers of motile zoospores that can swim in water for short distances.

Citrus gummosis

Foot rot or gummosis occur when zoospores splash onto a wound or bark crack around the base of the gumomsis. Isolates from the bark tested for growth on the selective medium at 23oc of temperature shows a white cottony colony after 72 hrs. For noncommercial purposes only, any Web site may link directly to this page. All components of APSnet are copyrighted and may not be reproduced or distributed except by express permission of APS.

Phytophthora fungi are present in almost all citrus orchards. Newer Post Older Post.