Fusarium and Root Rot of Conifers
The causative agent of fusarium (tracheomycosis) and root rot are soil pathogenic fungi. The most affected are spruce, fir, pine, larch. Outwardly, the disease in adult trees and shrubs is manifested in the reddening of needles and its shedding. A feature is the disease of the middle part of the crown in all conifers. The exception is the pine, in which the needles on the individual shoots turn yellow. In young plantings, the roots begin to rot. The seedlings turn brown, and after the roots die off, the plant falls to one side.
Most often, coniferous plantings located in areas with a high occurrence of groundwater are affected. When planting on heavy displaced soils, without additional preparation of the landing pit. In both cases, good drainage and saturation of the soil mixture with loosening materials (humus, peat, and others) are necessary.
First of all, we remove underground or accumulated water after melting snow and heavy rains, so that oxygen can flow to the roots. We treat the soil and root system of plants. We spill the root system with a solution of cardioid or foundational. When processing plants in summer cottages, especially if the family has small children, it is better to use biological products (bio fungicides) – phytosporin, gamer, alien, planarized. From them, you can prepare tank mixtures and simultaneously process the crown and soil under the plants. Biological products are effective in systematic processing throughout the warm weather season.
The fungus mainly affects larch and pine. In the spring, yellow-orange spots appear on the needles. Later, the mycelium forms spore-bearing bags. The needles are covered with brown spots. A feature of rust damage is that certain stages of development of the fungus take place on various herbaceous plants and, if successful, affect coniferous crops (wind, damp weather). Bubble rust can affect the trunk and perennial branches of Weymouth pine and Scots pine. Yellow-orange spots appear in the ruptures of the cortex – mycelium with spore carriers.
To treat plants with topaz fungicides (scor) or strobe. Repeat treatment 2-3 times in 15-20 days. A tank mixture of these drugs with the addition of kartotsida is especially effective. For the tank mixture, we prepare a solution of each fungicide separately and, after checking for compatibility, connect it together. The concentration of solutions and processing of plants is carried out according to the instructions.
Alternariosis, Mold, and Infectious Shrinkage of Branches
Altenariosis and gray mold most often affect the aerial parts of young juniper and arborvitae. The disease manifests itself in the form of gray-brown or blackish spots. Shoots lose their decorative effect. A closer look shows that the spots consist of fungal conidia, which serves as a source of infection of plants. Plants fall ill with thickened, unventilated landings, and insufficient lighting. Infectious drying of the branches is caused by several fungi and in appearance resembles a defeat by rust. The infection persists in the cracks of the bark and the plant remains of uncleaned needles, weeds, and other half-rotten debris.
- Sanitary pruning of sick and thickening branches. Depression of the crown and aerial parts of plants. All sections must be treated with garden varieties, copper sulfate solution or oil paint to prevent further infection of plants.
- Starting from early spring and throughout the warm period, carry out systematic spraying in 20-30 days with Bordeaux liquid, Abiga-peak preparations, soon, pure color. You can prepare a tank mixture from the above and other recommended drugs and sprinkle the plants. When using tank mixtures, the number of treatments can be reduced to 3 per season. Like the previous diseases described, altenariosis and mold, infectious drying of the branches are well removed by the aforementioned biological products.
The article describes the main, most common diseases of coniferous ornamental plants most often planted in summer cottages and house adjoining areas. I must say that all fungal lesions are well cured by biological products. Therefore, at home, look for ways to protect trees from infection with drugs that do not harm the health of the family and pets. The article provides some of the most commonly used chemical and biological products. They are not a dogma of disease. Every day, the chemical industry offers new, more effective drugs. You can independently choose those that are suitable for your species of conifers, grown at home.