• June 14, 2019

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. Inject 7—9 inches, 12—18 inches apart, and tarp immediately.

Citrus gummoosis of lime. When choosing a pesticide, consider the general properties of the fungicide as well as information relating to environmental impact.

In each orchard, 30 trees were selected and totally trees were assessed for gummosis incidence.

How to Manage Pests

CRC for tropical plant protection Brisbane Austrialia. A tree was defined and recorded as cankered when it had any of the following symptoms: Thoroughly wet the lesion. Topical Meetings and Workshops. Fao Production Data Base.

Gummosis – Wikipedia

Additionally, there is an association of Phytophthora root rot when roots are damaged by citrus root weevils, particularly Diaprepes abbreviatus. Decline may occur may occur over several years or can happen rapidly within a year, citrsu under conditions favourable for disease development.


Ciyrus foot rot of sweet orange tree showing bark necrosis, light gumming, and callusing. Likewise, the particular and most importantly this pathogen were spread during harvesting when climbing to the tree.

Select your language of interest to view the total content in your interested language. Systemic fungicides can control Phytophthora gummosis and ciyrus sprays can be used to protect against infection. If no lesion is present, wet the trunk from the ground up to a height of 2 feet.

Spray the surface of trunks to cover lesions thoroughly. Isolates from the bark tested for growth on the selective medium at 23oc of temperature shows a white cottony colony after 72 hrs. Under moist conditions, the fungi produce large numbers of motile zoospores, which are splashed onto the tree trunks.

Citrus Diseases

Isolation ghmmosis Phytophthora spp. This will ultimately cause the affected plant to collapse. It may also be seen if there was high flower initiation. Gummosis is one of the main diseases that contribute to for citrus decline.

X African Symposium on Horticultural Crops.

Citrus gummosis | Plantwise

The Phytophthora species causing gummosis develop rapidly under moist, cool conditions. Posted by Nick Sakovich at 1: Turk Journal of agricultural forestry The recommendations in this factsheet are relevant to: Disease survey was conducted in ten established citrus orchards in Upper awash, Errer-Gota, and Koka areas. When planting or replanting in soil infected with Phytophthora, or when a susceptible rootstock has to be used, fumigation may be helpful.


Symptoms can be seen in fruit if the disease is severe.

Gum secretion on citrus tree Photo by A. Gummosis and branch canker on Clementine mandarin tree.

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. Some citrus trees look unhealthy because of a common fungal disease called gummosis.

It should be noted that: Trunk and branch canker on lemon showing gummosis and bark death on a tree. Infected bark remains firm with small, longitudinal cracks through which abundant amber-colored gum is exuded. Do not exceed 4 applications of fosetyl-al per year. Visit for more gummsois articles at Journal of Horticulture.