Control of anthracnose in Phalaenopsis
Phalaenopsis cultivation area, introduction area have no degree of occurrence, harmful to Phalaenopsis and other flowers.
Symptoms: the main harm to the leaves, the primary light-colored round spot, and then gradually expanded into brown near-round spot, the edge is dark brown, the middle color is lighter, the late spot gives birth to black spots, the periphery of the spot is yellow.
The regularity of the disease: the pathogen is fungus, Alternaria spinifera. When the spores of the pathogen are transmitted by air flow, water droplets, high temperature, sunburn, low temperature, chilling injury, malnutrition and so on, the disease is often easy to occur.
Prevention and control methods:
(1) the orchid room should be ventilated and transparent, and the flowerpots should choose pottery pots and tile pots with good drainage and air permeability. Loose and fertile acid mud should be selected for soil. Do not make the plant suffer from high temperature burn or low temperature chilling injury.
(2) A small number of diseased leaves can be removed manually.
(3) spray prevention and treatment at the initial stage of the disease, you can choose: 700 times of 50% thiophanate wettable powder, 500 times of 50% mixed sulfur suspension, 200 times of 2% antimycin, etc., spray once in 7 days and 3 times in a row. When spraying with an appropriate amount of phytoprotegerin 7500 times solution, it has the effect of receiving both medicine and fertilizer.
- Prev
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
- Next
Control methods of anthracnose in Magnolia
The main results are as follows: (1) strengthen the management of water and fertilizer, increase the application of organic fertilizer and enhance plant disease resistance. (2) cut off the diseased leaves on the tree in time, clean the diseased and withered leaves on the ground, concentrate and bury them deeply, and reduce the source of infection. (3) at the initial stage of the disease, 84.1% Dobao wettable powder and 77% Kesha wettable powder were sprayed every 15 days for a total of 2 times. In the future, depending on the condition, spray 75% chlorothalonil wettable powder with a dose of 600 to 1000 times and 70% anthrax Fumei.
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