Phnom Penh is a precious flower that the people love, but it is difficult to raise. According to the author's observation, it was found that the main cause was stalk rot.
First, the characteristics of stem rot and disease
1. Symptoms: The disease is not easily detected at the beginning of the disease. The first part of the onset was the rootstock. The phloem of the disease department rots black and gradually develops toward the roots. However, the xylem was normal, the leaves were green and normal, and they did not fall. No symptoms were found on the surface.
2. Onset characteristics: The disease onset from June to October, with July to September as the peak incidence. At this time, it is at a high temperature and a strong light period. It was observed that the incidence was 37.5% in sunny places throughout the day, and only 5% of the incidence was observed in the sun at 9:00 am to 4:00 pm.
The diseased plants are mainly plants that grow rapidly in one year to five years and spring, and have many leaf blades, and they are highly infectious.
In terms of soil cultivation, the incidence of pot dry soil is significantly higher than that of water retention. The incidence of soil with 80% of rotted leaf soil content and 20% of river sand content was significantly lower than that of soil with half of the content of humus. Firewood soil 100% soil than the high incidence of low sediment incidence.
Second, prevention
According to the pathogenesis of Phnom Penh in Phnom Penh and three years of practice, the prevention and treatment of stem rot can be started in five ways:
1. Selection of soil for cultivation: Choose humus-rich soil with good drainage and water retention properties. This kind of soil can be directly from the mountain forest area dug directly to the surface of rot leaf soil and then mix in a small amount of river sand, cooked cake fertilizer can be, or use vegetable garden soil to add some rot leaf soil, a small amount of river sand, cooked cake fat can be.
2. The choice of potted planting environment: Phnom Penh is a kind of cool, cool and ventilated plant. The potted plants should be placed in a cool place from 9am to 4pm from June to October. Or take a shady shed solution.
3. Timely pruning: For the plants that thrive in the spring and have a large number of branches and branches, carry out topping and picking up leaves, and remove too many new sprouting branches to control the water to evaporate too quickly.
4. Water Management: We must keep the soil moist in summer and autumn, and do not dry in order to ensure the water supply of plants.
5. Treatment of diseased plants: Once the disease occurs, the diseased plants should be immediately disposed of together with potted soil. The pots should be washed and disinfected. Other non-pathogenic strains were sterilized with 500 times carbendazim to prevent the spread of disease.
In short, we must conduct comprehensive prevention and control of stalk rot to prevent it. For the one-year-old and five-year-old plants on the basis of the selection of culture soil, shady work done in summer and autumn, generally can better prevent the occurrence of stem rot.
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