Control of Fusarium Wilt of Cymbidium
Symptom blight is a serious disease of orchids. A seriously ill plant dies within a few weeks. A typical diseased plant can live for a year or more. The aboveground plant symptoms of Fusarium wilt are similar to those caused by Rhizoctonia solani Kuhn, i.e., the leaves turn yellow and wilt, the pseudobulbs become thin and twisted, and finally the roots rot. However, fusarium causes a spherical purple-red color, and finally the rhizome is also damaged and turns purple-red. When the disease is serious, the pseudobulb will rot deeply.
Conditions of onset:
(1) Soil temperature 28℃, soil moisture, continuous cropping pot, transplanting or injured roots, plant growth potential weak disease.
(2) acid soil and nematodes feeding on the wound caused by the disease. Below 21℃ or above 33℃, the disease expands slowly. Fusarium oxysporum Schlecht., It belongs to subphylum Semi-fungi. Strain white, pink, violet to purple. Small conidia are born in aerial hyphae, aggregated into false heads, numerous, oval, elliptic, cylindrical, straight or curved. Large conidia thin-walled, born on aerial hyphae, rarely born in conidia peduncle or myxospore mass, spindle-shaped or sickle-shaped, sickle-shaped curved, elliptically-curved, sub-crescent-shaped or straight, thin apical cells, peduncle with peduncle. Chlamydospore walls smooth or rough, numerous, interhyphal and interconidia, terminal and intermittent, solitary or paired.
Control methods:
1. Because the pathogen can parasitize and satiate, the infected plants and their residues must be completely burned, and new pots and new soil must be replaced to replant orchids.
2. At the early stage of disease, spray 50% carbendazim WP or 36% methyl sulfur bacteria suspension 500 times, in addition to 20% methyl chlorphos EC 1000 times or 10% Zhiweiling aqueous solution 300 times or 12.5% synergistic carbendazim concentrated solvent 200 times irrigation roots.
- Prev
African Violet
African violet, also known as African violet, is a perennial evergreen herb belonging to the genus African violet of the family Gesneriaceae. African violets native to tropical east africa prefer warm, humid, semi-shady environments. If the light is insufficient, it will bloom less and pale, or even only long leaves do not bloom; if the light is too strong, it will cause yellow leaves and scorched phenomenon, which can be maintained in bright light and no direct sunlight. The suitable temperature for growth is 16℃ to 24℃, and it should not be lower than 10℃ in winter. In cultivation, it is necessary to avoid sudden rise and fall of temperature, otherwise the plant is easy to die.
- Next
Hybrid Magnolia leaf blight
The main symptoms occur on the leaves, and in severe cases, they can spread to petioles and buds. The disease spot mostly occurs at the leaf edge, the initial stage is faded green macula, watery, many disease spots are connected into pieces, the fan shape extends outward, the edge is dark brown, and the inside is grayish yellow, which can cause early defoliation. In a humid environment, black-gray grains appear on the fallen leaves. The cause of the disease is a fungal disease; the pathogen lives in the leaf bud and on the remnant of the diseased plant, and by means of airflow transmission, it can be infected directly from the stomata of the leaves with weak growth or physiological injury, and the wind speed is high.
Related
- Fuxing push coffee new agricultural production and marketing class: lack of small-scale processing plants
- Jujube rice field leisure farm deep ploughing Yilan for five years to create a space for organic food and play
- Nongyu Farm-A trial of organic papaya for brave women with advanced technology
- Four points for attention in the prevention and control of diseases and insect pests of edible fungi
- How to add nutrient solution to Edible Fungi
- Is there any good way to control edible fungus mites?
- Open Inoculation Technology of Edible Fungi
- Is there any clever way to use fertilizer for edible fungus in winter?
- What agents are used to kill the pathogens of edible fungi in the mushroom shed?
- Rapid drying of Edible Fungi