Phytophthora citrophthora is a soil-borne oomycete in the family Peronosporaceae that causes brown rot of citrus, marked by gummosis in which lesions around the base of the tree exude sap, along with dark lesions at the soil line, a sour odor, bark cracking, canopy yellowing and, in severe cases, tree collapse from girdling. Besides citrus, it also affects stone fruits, cacao and ornamental plants. Unusually among Phytophthora species, it is most active during the moderate temperatures of spring, fall and winter rather than in warm weather, surviving winters in soil as oospores and on decaying plant material; it can survive below 5 degrees Celsius, grows best between 24 and 28 degrees, and stops growing above 35 degrees.
Facts
Control Method Control Method Control Method Connections
Sources
1. Phytophthora citrophthora (Wikipedia)
lead description
Phytophthora citrophthora is a soil-borne oomycete in the family Peronosporaceae that causes brown rot of citrus, marked by gummosis in which lesions around the base of the tree exude sap, along with dark lesions at the soil line, a sour odor, bark cracking, canopy yellowing and, in severe cases, tree collapse from girdling.
Article text
Resistant lemon varieties have been developed and their implementation has been effective at controlling the spread of the disease.
Article text, control method
Keeping grafting lines well above the soil line and adding a copper based fungicide also works to reduce rates of infection.
Article text, control method (2)
Cultural control of this disease mostly includes the use of resistant rootstocks and water management practices.
View the SourceReader Challenges (0)
No disputes yet. Spotted an error or a better source? Open the first one.
Sign in to dispute this or suggest a correction.