Control methods of Leaf spot of Cymbidium

Symptoms: the disease spot on the leaf is reddish brown, the edge color is deep and the middle is light, nearly round, 1-5 mm, the disease spot can heal into large patches, and in severe cases, the disease spot is covered with the whole leaf, and the leaf withered early.

Pathogen: Cercosperasp, Cercospora. Conidiophores pale brown, apical nearly colorless, septate, 23.1 × 70.4 μ m × 3.9 × 5.7 μ m; conidia colorless, slender tail whip-shaped, 21.1 × 120.8 μ × 3.1 × 5.1 μ m.

Disease regularity: the pathogen overwintered with mycelium on the diseased remains and corms, and spread by airflow and Rain Water. The disease was serious when warm and humid.

Prevention and cure method: ① is properly closely planted to avoid excessive watering, and 7500-fold solution of phytoprotegerin is sprayed to promote early growth and rapid development of the plant. At the initial stage of ②, 40% polysulfide suspension or 50% methyl topiramate was sprayed, or 58% Remicol wettable powder was sprayed 800 times, 50% Sukeling 2000 times or 50% carbendazim 1000 times 1500 times, once every 7 days, 2 times continuously.

How to raise sword orchid? the culture method of sword orchid

How to raise sword orchid, as a common plant, sword orchid, together with roses, carnations and Fulang flowers, is known as the "four cut flowers in the world". So many flower friends will raise a sword orchid at home, here are the breeding methods and nursing points of sword orchid, hoping to be helpful to the flower friends who raise sword orchid.

Culture methods of sword orchid 1. Requirements for soil of sword orchid

Sword orchid should be planted in soil with good ventilation and permeability. if the soil is relatively sticky, it can be improved by adding organic fertilizer, straw or sand before planting. Sword orchid requires that the soil pH value is between 6Mel 7, and the soil pH value less than 5 will cause fluoride toxicity. In order to improve the soil PH value, lime (mixed evenly with the soil) should be added to the soil one month before planting, and the soil pH value higher than 7.5 will cause element deficiency, which can be prevented by applying organic fertilizer in the soil.

2. Water quantity control of sword orchid.

Before emergence, the sword orchid should be irrigated every 10 days. Do not dry out after the seedlings come out, otherwise the leaf tip will turn yellow easily. After the appearance of scape, it can not be affected by drought. Yuanyuan in summer should be irrigated once every 4 days. Irrigation should be stopped after flowering to prolong the flowering period.

3. The temperature of sword orchid should be warm

Sword orchid like warm, humid climate, avoid high temperature and heat, not cold-resistant, the most suitable temperature for growth is 20-25 ℃. When the soil temperature was higher than 5 ℃ in early spring, the corm could sprout, and the growth was inhibited when the temperature was higher than 35 ℃ in summer. Generally speaking, sword orchid can blossom about 3 months after planting, but the cultivation cycle is greatly affected by the temperature in the growing period. The higher the temperature in the growing period, the shorter the cultivation cycle. For example, when the average temperature in the growing period is 12 ℃, it takes 110 to 120 days from planting to flowering, 90 to 100 days when the average temperature reaches 15 ℃, 70 days to 80 days at 20 ℃, and only 60 days to 70 days when the average temperature reaches 25 ℃.

4. Sword orchid should have plenty of sunshine

Sword orchid is not shade-tolerant and is a long-sunshine plant, and 16 hours of light a day is the most suitable. Cut flower varieties are greatly affected by light. If the sunshine is sufficient, the flowers will grow strong, the resistance is strong, and the flower color is bright and lasting, but in hot summer, it is also necessary to avoid strong direct sunlight.

5. The demand of fertilizer for sword orchid

Sword orchid is a shallow root plant, fertilizer should be applied shallowly, fertilization should take into account both nitrogen, phosphorus and potassium, topdressing at two true leaf stages (after flower bud differentiation) and heading stage, apply dilute fecal water plus urea once, re-apply potassium fertilizer in the middle stage, and pay attention to nitrogen control in the later stage, so as not to overgrow the plant and cause lodging. The plots dominated by seed bulb production should be mainly increased with potash fertilizer.

6. Pest control of sword orchid.

The common diseases of sword orchid are corm rot, leaf blight and so on; the common insect pests are thrips and slugs, so we should pay attention to maintenance and deal with them in time.

Key points of sword orchid maintenance

1. Cut a short section at the lower end of the flower rod at 45 °after receipt, remove the flowers at the bottom that affect the vase, and remove the leaves immersed in water.

2. Put 1 stroke 3 water in the vase, change the water and cut the roots once every 2-3 days when there is no antistaling agent, and change the water once every 1-2 days without antistaling agent. Clean the bottle mouth to avoid the growth of bacteria.

3. Avoid direct sunlight and wind blowing.

The breeding method and precautions of tiger skin sword orchid it is a good choice to raise a tiger skin sword orchid at home. Tiger skin sword orchid, also known as tiger tail orchid, has erect leaves with gray-white and dark green tiger-tail-shaped stripes, resolute posture, strange and interesting; it has many varieties, great changes in plant shape and leaf color, exquisite and chic; it has a strong ability to adapt to the environment, and is a kind of indomitable plant. Phnom Penh tiger skin orchid belongs to the genus Polygonaceae, which is one of more than 60 species of tiger skin orchid with high ornamental value and is distributed in both tropics and subtropics. The following is the editor of the net to talk in detail about the breeding methods and matters needing attention of tiger skin sword orchid.

Culture methods and matters needing attention of tiger skin sword orchid

Ecological habits: light-loving long-day plants, winter cultivation cloudy days to increase light, afraid of cold. The suitable growth temperature is 20-25 ℃ in daytime and 10-15 ℃ at night. Through the dormant corms, the bulbs germinated at 4-5 ℃, and the plants froze to death when cultivated at 0 ℃ in winter. Do not tolerate waterlogging and avoid stagnant water in the cultivated land. For the sandy loam with good drainage and fertile soil, the pH value of 5.6-6.5 is better.

The main diseases are:

a. Penicillium rot, harvest and transportation, try not to hurt the seed bulb; soak in 2% potassium permanganate solution before planting: hour; pull out the diseased plant at any time during the growth process.

b. For dry rot, the disease-free mother ball should be selected when planting, and the diseased plant should be pulled out in time in the process of growth.

C. "blind flower" is a physiological disease, which mostly occurs in protected cultivation in winter. The method of prevention is to ensure suitable temperature and light, and select varieties that are resistant to low temperature and short sunshine.

The main pest is double-line mucilophilic slug, which can be sprayed with lime water and ammonia water; sprinkle lime powder around the garden to prevent it from entering; artificial culling.

Soil.

Tiger skin orchid soil needs loose, strong air permeability, so when preparing soil for tiger skin orchid, we must pay attention to the rotten leaves of 2 big 3, plus 1 big 3 garden soil, and keep in mind that the soil must be loose and breathable, otherwise the water will not evaporate easily and lead to rotting of the rhizome. It can also be mixed with 3 parts of fertile garden soil and 1 part of cinder, and then add a small amount of bean cake or chicken manure as base fertilizer.

Reproduction

It can be propagated by ramet and cuttage. All varieties of tiger skin orchid can be divided into plants, generally combined with changing pots in spring, the method is to cut the overgrown leaves into several clumps, each with leaves, but also a section of rhizome and sucking buds, which can be planted in the pot respectively.

Yellow rimmed or silver-veined varieties of tiger skin orchid use cutting method, when the temperature is above 15 ℃, the practice is to take leaves 5-10 cm long, slightly dry after cutting into the sand, cutting can not be reversed, cutting after spraying new high-fat film, on the plant surface, can prevent bacteria infection, improve the ability to resist natural disasters, improve the intensity of photosynthesis, pay attention to maintain a certain humidity, after a month can take root.

Temperature.

Tiger skin orchid has a high requirement for temperature. The suitable temperature for its growth is 20-30 ℃, and it stops growing when it is below 13 ℃. The lowest temperature in winter should not be lower than 10 ℃, otherwise the base of the plant will rot and the whole plant will die.

Humidity

During the growing period, the tiger skin orchid should be watered rather than wet. When new plants sprout at the root neck in spring, they should be watered properly to keep the basin soil moist, and do not let water accumulate in the basin in the rainy season. Usually, clean water can be used to scrub the foliar dust to keep the leaves clean and bright.

Generally speaking, if the soil is loose, it is watered twice a week; in winter, it is colder and only needs to be watered once.

Fertilizer

Tiger skin orchid does not have high requirements for fertilizer. 15% cake fertilizer and water can be applied every half a month in the growing season. Spraying Zhuangtuanling can make plant stems stout, leaves thick, leaves fresh and tender, and plants luxuriant. In the peak growth period, fertilizer can be applied once or twice a month, and the amount of fertilizer should be less; if only nitrogen fertilizer is applied for a long time, the markings on the leaves will become dim, so compound fertilizer is generally used. You can also evenly bury 3 holes of cooked soybeans in the soil at the edge of the basin, with 10 grains in each hole, be careful not to come into contact with the roots, and stop fertilizing from November to March of the following year.

Disease and pest

The common diseases of tiger skin orchid are leaf spot and anthracnose, which can be treated by spraying more than 50% carbendazim; common pests are harmful to weevil, and 1000 times of fenitrothion EC can be used to kill them.

Adult tiger skin orchid can blossom every year, and fragrance, but mainly to observe the leaves. This kind of plant is drought-resistant, moisture-resistant, shade-resistant, can adapt to a variety of harsh environment, suitable for garden beautification or potted, for advanced flower indoor plants, very suitable for decorating living room, study lamp place.

According to experts, tiger skin orchid can absorb more than 80% of indoor harmful gases, especially for formaldehyde, especially in newly renovated houses, and tiger skin orchid can also protect against radiation. The above tiger skin orchid culture methods and matters needing attention for your reference!