Symptoms of citrus gummosis disease leg base rot disease
This disease affects the roots, trunks and main branches of citrus trees, as well as infecting the fruits and causing them to rot.
The infection begins at the base of the trunk in the crown area, where the main roots are affected, as well as the nearby fibrous roots, which leads to their death and rotting.
symptoms of citrus gummosis
1-Symptoms initially appear in the form of brown rot on the bark that includes the outer crust, bark and cambium, knowing that the wood of the stem is not infected unless it is touched by secondary organisms that cause rotting.
2- The bark dries up and cracks longitudinally on the trunk, and the gummy secretions flow down on it in large quantities, and with the development of the infection, the death of the cambium tissue occurs.
3- The infection constantly develops in the presence of appropriate conditions around the trees, so the bark dies, as well as the cambium, which leads to the suspension of the flow of juice from the top of the tree to the roots, and it stops performing its functions, which leads to the deterioration of the trees, accompanied by yellowing and falling leaves, death of branches and the lack of new growth on the tree. Trees and their poor production as a result of rot and easy peeling of the bark from the roots.
The infected bark grows secondary microbes and the infection extends to the wood of the tree, accompanied by an unpleasant smell.
4 – Young leaves may turn brown, and some fruits may be infected with dry, gummy brown spots (sooty mold ) and the infection spreads among the fruits, which leads to poor production.
5- Infection of citrus seedlings with this disease leads to their rapid death.
citrus phytophthora gummosis treatment
Control is carried out by producing healthy, disease-free seedlings through the following:
1 – Treating the seeds with hot water at a temperature of 52 degrees Celsius for 10 minutes to get rid of the infection, or treating the seeds with one of the recommended fungicides.
2- Cultivation in sterile soil free of disease pathogens.
3- Sterilizing the soil of the nursery with chemicals such as granulated basamid at a rate of 40-60 g / square meter, then the soil is irrigated and covered with thick plastic tarpaulin for a period of 5-7 days, then it is ventilated and left 1-3 weeks before planting.
4- Avoid the use of agricultural machinery contaminated with the disease pathogen.
5- It is recommended to vaccinate citrus on disease-resistant assets such as Citrus aurantium, Trostrang, Trifoliana and Macrophylla.
6- The grafting area should be at a distance of 30 cm from the surface of the soil.
7- Planting should be done in the nursery at wide distances that allow for good ventilation of the trees.
8- The irrigation water should not come into contact with the tree trunks, while avoiding planting in soil that is not well drained.
9-Using a drip irrigation system to reduce moisture around trees.
10 – Continuing to pass trees periodically to discover the disease and treat it in a timely manner before the disease spreads among the trees on the farm.