How to control anthracnose of Phoenix tail orchid
Cymbidium anthracnose is a frequently-occurring disease of Cymbidium, which spreads very fast. if the disease is not controlled in time, it will not only affect the ornamental effect, but also lead to plant death. The symptoms, regularity, prevention and treatment of the disease are introduced as follows:
Symptoms: first occurred at the tip of the leaf, the initial brown spots, and then showed a round or irregular outward expansion, the disease spot grayish brown, surrounded by yellow halo, the surface scattered with black particles, the whole leaf was black after infection.
The law of incidence: the disease occurred by the infection of Cercospora tequila, and the peak period was from mid-May to early October. The pathogen overwintered on the diseased leaves in the state of hyphae, conidia and sclerotia and spread by wind and rain. The disease is easy to occur under the conditions of high temperature, high humidity and no ventilation.
Control methods: 1, strengthen the management of water and fertilizer, enhance the tree potential, and improve the disease resistance of the plant; 2, pay attention to the selection of planting environment at the initial stage of planting, and the cultivation site should have a good ventilation environment; 3, remove the diseased leaves in time and burn them centrally. reduce the source of infection 4. Spraying 1000 times of 50% anthrax Fumei solution or 75% chlorothalonil wettable powder once a week for 3 times 4 times can effectively control the disease.
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Propagation methods of Magnolia mandshurica
There are two main methods for the reproduction of Magnolia magnolia: sowing and grafting. (1) sowing and breeding 1. The fruit of Magnolia magnolia harvested and seed storage matured from September to October, and when it matured, the fruit cracked and exposed the red aril, which should be harvested in time when the fruit was slightly cracked and the aril was just red and yellow. After the fruit is harvested, hang it in the shade for 6 days to promote cracking. Take out the seeds with aril and soak them in clean water for 2 days. Wipe off the aril to remove the shrunken grains, or scrub it with plant ash to remove the aril. The obtained Baijing seed mix
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Brief introduction of anthracnose in Guolan
Cymbidium anthracnose harms Cymbidium, Cymbidium, Jian Orchid, Cymbidium, Cold Orchid and other orchids, causing scorched black spots on leaves and fruits, and in serious cases, the whole leaves die. At the initial stage of the onset of the symptoms, the middle of the leaf showed a round, oval shape, and the leaf edge showed a semicircular reddish-brown spot. It occurs at the base of the leaf, and the whole leaf can die when the disease spot is large or the number is large. In the later stage, the center of the lesion became lighter and the upper chakra was longitudinally ruptured. The disease spot on the fruit is irregular, showing a long black-brown spot. The pathogen is caused by several fungi. According to the separation and training of Shanghai Landscape Research Institute
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