Batch Of Citrus Canker On Stem Characters
Disease cycle of citrus canker first the infection starts through the infected leaf or stem which disseminates through rain and wind which carries the inoculum to the uninfected plants. Dewdney associate professor of plant pathology and extension specialist.
Citrus canker is a disease affecting citrus species caused by the bacterium xanthomonas axonopodis.
Citrus canker on stem. Fruit and stem lesions. Then the inoculum slowly causes water congestion inside the stomata and mesophyll cells of the plant tissue. Fruit typical citrus canker lesions on fruit will range from 1 10 mm in size.
Where inoculum present considerable mature leaf infection and stem lesions particularly bad in young blocks especially if high canker in surrounding blocks. While not harmful to humans canker significantly affects the vitality of citrus trees causing leaves and fruit to drop prematurely. Citrus canker alternaria and scab diseases of citrus megan m.
On fruit the lesions can vary in size because the rind is susceptible for a longer time than for leaves and more than one infection cycle can occur figure 9. A fruit infected with canker is safe to eat but too unsightly to be sold. The citrus leafminer phyllocnistis citrella has increased the vulnerability and susceptibility of citrus trees to canker.
Citrus canker lesions on fruit figure 7 and stems figure 8 extend to 1 mm in depth and are superficially similar to those on leaves. Fruit lesions may vary in size and may coalesce. The disease which is believed to have originated in southeast asia is extr.
Fruit lesions consist of concentric circles. Infection causes lesions on the leaves stems and fruit of citrus trees including lime oranges and grapefruit. Leaves and stems damaged by the citrus leafminer are more likely to be infected because the wounds allow the bacterium to easily penetrate the tissue figure 2.
Larger lesions usually penetrate a few millimeters into the rind. On some varieties these circles are raised with a rough texture on other varieties the concentric circles are relatively flat like the surface of a record.
