June 24, 2019 posted by

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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Knowledge Bank citrjs Change location. Hot summer weather slows disease spread and helps drying and healing of the lesions.

Phytophthora is a water mold Class Oomycetes, formerly a fungus-like protist that is found throughout the world.

Citrus gummosis of lime

Sweet orange tree more than half girdled by a Phytophthora lesion at the base of the tree. Fao Production Data Base. Visit for more related articles at Journal of Horticulture. Citrus production in Ethiopia is threatened by a number of biotic and abiotic factors.

When choosing a pesticide, consider the general properties of the fungicide as well as information relating to environmental gummosiis. Thoroughly wet the lesion. There is no sense in treating if the bark appears dried up and cracked; the fungus is gone.

Apply with 6—12 inches of water. These cutrus are the infective agents that may be transported in rain or irrigation to the roots. Careers In Plant Pathology. But for a practical control measure for the homeowner, simply cutting out the diseased bark and painting the area with a registered copper fungicide will rectify the problem. If you would gummmosis to, you can learn more about the cookies we use. Pure cultures of Phytophthora spp.


This is to ensure that we give you the best experience possible. The recommendations in this factsheet are relevant to: The main symptom of citrus gummosis is oozing tummosis gum cjtrus the affected parts on the trunk. Late stages of Phytophthoragummosis are distinct, but early symptoms are often difficult to recognize.

When this happens, the infected bark will dry up and crack. All thus features were also described by Farih, et al. Fumigants such as metam sodium are a prime source of volatile organic compounds VOCswhich are a major air quality issue. The Phytophthora species causing gummosis develop rapidly under moist, cool conditions.

Citrus Diseases

During the summer, gum deposits dry and stick to the gumomsis, making the symptoms of gummosis very noticeable. CRC for tropical plant protection Brisbane Austrialia.

Foot rot or gummosis occur when zoospores splash onto a wound or bark crack around the base of the trunk. It is being produced mainly in Dire Dawa areas, lower and middle Awash and Melkassa areas in southeast region of Ethiopia.

Disease severity index DSI was then calculated as: The dominant status of P. Isolations from the bark of citrus tree revealed the presence of the fungus Phytophthora spp, the cause of citrus gummosisaffecting root crown and the branch.

Topical Meetings and Workshops. Gummosis incidence was determined as the proportion of plants showing gummosis symptoms, expressed as a percentage of the total number of plants assessed [ 8 ]. Leonard and Nathan [ 17 ] reports about the vummosis survival mechanism were that citeus fungus survives in the soil as a thick-walled spore capable of withstanding extremes in both moisture and temperature.


Likewise, if there is gum secretion on any part of the tree, clean it off and use Bordeaux-pest as mentioned before. Agri and Aquaculture Journals Dr. New bark will eventually begin to grow around the wound. Fibrous roots slough their cortex leaving only the white thread-like root cylinder. Turk Journal of agricultural forestry Dead bark tends to break away from the trunk in vertical strips.

Always read label of product being used. In removing the diseased tissue, only the bark should be removed; there is no need to cut into the wood.

Whole tree – Phytophthora may result in poor tree health, thin canopy, failure to make new growth, and little water and nutrient uptake leading to wilting. Basis for production planning. In general if the inoculums of the disease from soil were kept away through by any means to the rootstock and the trunk, the disease pressure will be minimized.

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The disease samples were taken from the active lesion near to the crown and branch showing the symptom of the disease. Recheck frequently for a few months and repeat if necessary. The average minimum and maximum annual temperature were Trunk – infection of the trunk by Phytophthora results in dark water soaked areas in the area of active infection. This disease is also known as gumming diseases of citrus. Phytophthora foot rot, root cjtrus, brown rot, gummosis, and Phytophthera – Citrsu PD complex.