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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Disease survey was conducted in ten established citrus orchards in Upper awash, Errer-Gota, and Koka areas.

Gummosis – Wikipedia

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. April 16, Accepted: Topical Meetings and Workshops. Created in Nepal September Secondary infections often occur through lesions created by Phytophthora.

The dominant status of P. These relations clearly mean when altitude increases incidence on root stock, branch and trunk as well as tree decline also decreases. But it can be reversed with the integration of fungicides, dimethomorph the data is not observedby avoiding excessive overwatering, poor drainage and soil structure, proper bud union avoiding a bud union at soil surface or less than 15 cm above soil line those which enhances the disease gummosis.


But once the infection spreads and kills more than a third of the bark tissue around the trunk, the tree will either die or produce very poorly. Plant Disease Cover Images Unfortunately, we cannot provide individual solutions to specific pest problems. Nothing can be done about the rain, but if trees are irrigated, the water must not hit the trunk of the tree. When planting or replanting in soil infected with Phytophthora, or when a susceptible rootstock has to be used, fumigation may be helpful.

It occupied hectares of land in in the country, but the area has come down to 5, hectares oranges, mandarin and hectares limes and lemon with a production of 33, metric tons only [ 6 ]. If you would like to, you can learn more about the cookies we use. In each orchard, 30 trees were selected and totally trees were assessed for gummosis incidence.

Contact Us – Report a Bad Link. For PC, position your mouse cursor on the featured image, click the right mouse button, and choose “Save Picture As Foot rot or gummosis occur when zoospores splash onto a wound or bark crack around the base of the trunk.

How to Manage Pests

The disease samples were taken from the active lesion near to the crown and branch showing the symptom of the disease. Close Find out more. AgricultraTropica et Subtropica Visit for more related articles at Journal of Horticulture. The gumming and cracking symptoms were observed on root stock, trunks and branches which produced a light yellow and brown gum across the sampling orchards.


Phytophthora nicotianae Breda de Haan var. Continuing to use www. Fibrous roots slough their cortex leaving only the white thread-like root cylinder.

The survey results have shown that the disease was prevalent in all the surveyed orchards with different magnitude of infection.

Citrus Diseases

Trees become infected when fungal spores on the ground splash onto the trunk. The modified V-8 agar consisted of eight vegetable agar V-8 agar composed of 2 g CaCO 3mL V8 gummosiss and 15 g yummosis in mL distilled water amended with 20 mg Pimaricin, mg Ampicilin, 75 mg Vancomycin, 50 mg Dichloran, which were dissolved in 10 ml distilled sterile water and added to 1 liter of V-8 agar [ 10 ].

Related article at PubmedScholar Google. Newer Post Older Post. Agriculture and Natural Resources, University of California. Branches with this symptom resulted in die back of a tree that could not keep their fruits and leaves alive for the next season.