Diseases and insect pests of yellow cicada orchid and its control

Southern blight

Disease overview: white silk disease occurs more in the rainy season season, the early onset of yellow cicada orchid leaf base will be full of white hyphae. These hyphae gradually cause the rhizome of the yellow cicada orchid to rot.

Control method: Remove all the soil in the potted yellow cicada orchid, and sprinkle quintozene powder or lime in the remaining pot soil.

Radical cure method: Put yellow cicada orchid in ventilated and transparent place, and pay attention to whether its basin soil drainage is good at all times. If the disease is serious and cannot be saved, the diseased plants need to be removed from the pot soil and burned.

anthracnose

Disease overview: anthrax is a yellow cicada orchid all year round have disease, especially in the high temperature rainy season, yellow cicada orchid more susceptible to anthrax. Anthracnose spreads from the tip of the leaf to the rhizome. The color of the disease spot is brown at first, and with the gradual expansion and increase, many dry black spots will appear on the stem of the yellow cicada orchid. In severe cases, the disease will lead to the death of the whole yellow cicada orchid.

Control methods: First of all, we should actively change the cultivation environment conditions of yellow cicada orchid. Secondly, during the onset period of yellow cicada orchid, 50% thiophane methyl wettable powder 800-1500 times liquid spray treatment, once a week, supplemented by 1% equivalent Bordeaux mixture, twice a month, continuous spray 3-5 times can treat this disease.

scale insects

Disease overview; scale insects often in high temperature and humidity, the air is not smooth under the circumstances of rapid reproduction, harm plants.

Control method: spray 1% omethoate or 1500 times 50% mala sulfur during the incubation period of scale insects. If the number of yellow cicada orchid pots in the home is not a lot, you can also brush the eggs with a gentle brush.

After understanding the pests and diseases of yellow cicada orchid and their control methods, do you have some confidence in maintaining your own flowers? Let's take a look at the breeding methods of yellow cicada orchid!

Pest and disease of yellow cicada and its control method

Diseases and control methods of yellow cicada

soot disease

The pathogen is fungi of Ascomycetes, including Meliola, NeoMeliola, etc. The asexual stage is mostly to spread tobacco mold. The pathogen overwinters on diseased parts or diseased bodies by epiphyte mycelium, reproduces by nectar secreted by scale insects as nutrients, and spreads by wind and rain and scale insect activities.

At the early stage, most or part of the branches of the injured plants were black, and the infected parts were covered with black mold, which made them sticky when touched.

In the late stage of disease, the leaves can be partially peeled off, the leaves are black and white mottled, the photosynthesis of seriously infected plants is blocked, the growth is poor, the leaves fall ahead of time, and the ornamental value is greatly reduced.

control methods

Plants should be kept in a ventilated environment to keep the air flowing.

Once the disease occurs, spray 40% Soxu EC 1000-3000 times, or 40% Lesben EC 1000 times, or 25% Youdele EC 2000 times (spray diluted solution for scale insects and nymph stage), or spray 50% anti-aphirimidine EC 2000-3000 times.

Pest Insects and Control Methods of Yellow Cicada

ceroplastes Rubens Maskell

The yellow cicada red wax scale belongs to Homoptera, Coccidae (or called wax scale family) pests, host range is very wide, is one of the main pests harm yellow cicada. Female adults and nymph prick and suck the sap of branches and leaves of yellow cicada, causing malnutrition, weak growth, blocked flowering and fruiting, and even causing branches of yellow cicada to die.

The female adults overwinter on the branches as fertilized eggs. May and June of the following year are the peak period for overwintering female insects to lay eggs, eggs are laid under the body, and the laying period lasts for more than a month.

After a certain period of time, the newly hatched nymph crawls and fixes on the host to feed. Generally, it begins to secrete wax after 6 hours of fixation. After 15 days, it can form a star wax coat. Once the wax layer is formed, the control effect is not ideal.

control methods

Artificial control, in the early stage of the occurrence of red wax scale, timely remove the insect body, or cut off the branches and leaves of many insects, concentrated destruction.

Horticultural control, pruning, air circulation and light conditions will reduce the damage of yellow cicada red wax scale.

Control and application of common diseases and insect pests of Magnolia denudata

Common pests and diseases of Magnolia denudata: anthracnose, leaf spot disease, fried cicada, red wax scale, blown cotton scale, red spider, large lionfish moth, longicorn, etc., once found, can be sprayed with drugs. But there are longicorn moth branches and roots, sometimes can kill the tree, such as sawdust dust insect dung, should look for insect holes, with cotton balls dipped in dichlorvos stock solution into insect holes, and then sealed with mud, you can smoke and kill. 1. Cicada explosion. The nymph of this insect sucks the root juice of flowers in the soil. In addition to stinging and sucking the main leaf juice, the female insect will insert the ovipositor on the branch to lay eggs, causing the branch to die. 2. Timely search and kill newly unearthed mature nymph. 3. If it happens more often, it can be ignited near the tree stem at night in hot summer weather, shaking the branches, causing cicadas to be burned to death, and killing cicadas falling outside the fire. 4. Apply sticky tung oil or sticky dough kneaded with spider web to the end of the rod to catch adults. 5.4-8 Monthly inspection and cutting spawning branches. 6.。Red wax scale. The nymph and adult of this insect suck the sap of flowers, and its excreta often induce the occurrence of coal pollution, so that a layer of black mold or thick black film is formed on the leaves, so that the whole plant becomes black tree, the plant is weak, the tree shape is haggard, and few flowers or no flowers can be bloomed. 7. In winter and early spring, combine pruning to remove some of the wormy branches. 8. If the injured flower plants are less short, they can be manually scraped in winter and spring. 9. At the peak of nymph incubation, spray 25% phoxim emulsifiable solution 1000 times, or 40% omethoate emulsifiable solution 1500 times, spray once every 4-6 days, spray 3 times can be effective. 10. When introducing flowers and seedlings, check carefully to prevent insects from being brought in. Disease control anthracnose control methods Strengthen water and fertilizer management, enhance tree vigor, improve disease resistance; remove diseased leaves in time, remove fallen leaves at the end of autumn and burn them intensively; if there is disease, spray 800 times solution of 75% chlorothalonil wettable particles or 500 times solution of 70% anthracnose Formex, once every 10 days, continuously spray 3 to 4 times to effectively control the disease. Chlorosis is a physiological disease, mainly caused by soil viscosity, pH value exceeds the standard, and iron supply is insufficient. Can use 0.2% ferrous sulfate solution to irrigate roots, can also use 0.1% ferrous sulfate solution for leaf spray, and should apply more farm manure. Leaf burn disease control methods increase watering times, keep soil moist; apply more organic fertilizer, enhance tree vigor, improve plant resistance; white or dry the tree.