What are some common pests and diseases of orchids? What are the orchid pests and diseases?

Orchid leaf blight, also known as round spot or black spot, is a more serious disease of orchids. The disease mainly occurs on the leaves, the initial lesions are dark brown, nearly round, the lesions that occur at the leaf edge are semicircular, and then rapidly expand into oval large spots, the edges are black-brown, ** gradually become light brown, when wet, reddish-brown protruding dots can be produced on the back of the leaf or on the leaf surface, and they are arranged in a sparse wheel-like manner. The disease mostly occurs in the middle and lower parts of the leaves, and it is easy to cause the death of the leaf segments above the lesions.

The pathogen generally invades from the wound, and can also directly invade the young leaves, and the disease is prone to occur under the conditions of suitable temperature and high humidity. Among the orchids, Han orchid, Chun Lan, Jianlan and Hui Lan are susceptible to diseases, especially Han Lan. The prevention and control methods refer to the prevention and control methods of orchid anthracnose.

Black rot affected plant leaves appear translucent small spots, almost all over the leaves, the lesions expand and affect the whole plant (including the roots), after the adult plant is damaged, 2 to 5 days on the leaves or pseudobulbs appear dark and slightly water-soaked spots, the lesions later become purple-black and shiny, in a warm and humid environment, the diseased part becomes soft, and the diseased leaves sometimes have water oozing. When the environment is dry, the sick area dries out. Prevention and control methods:

Cut off the diseased leaves and damaged false bulbs, burn them intensively, and soak the used knives and scissors in 75 alcohol. Avoid watering when watering, and do not place the pot too densely to facilitate ventilation and light. <>

Diseases caused by viral diseases are quite common and severe in orchids. Due to the different types of pathogenic viruses and the varieties of orchids, rothoric necrotic spots, gem-like necrotic black spots and whorl-shaped fading spots can be produced on orchid leaves. Prevention and control methods:

Strictly select and plant virus-free seedlings and sowing seedlings, remove weeds in a timely manner, immediately pull out and destroy diseased plants, disinfect tools that come into contact with diseased plants in a timely manner, and plant pots and potted plant materials that have been planted with diseased plants can no longer be used. Scale insects are the main scale insects that damage orchids, such as orchid scales, shield scales, striped chaff flakes, and mulberry white shield scales. When a small amount occurs, it can be removed with a soft brush and then rinsed with water.

If there are more scale insects, 1000 times of 40 rapid culling emulsion or 1000 times of 50 malathion, 25 iminophos emulsion and other liquids can be sprayed at the peak of incubation. When spraying, it is required to spray the front and back of the leaves, and sprinkle more than 3 times in a row, with an interval of 5 to 7 days each time. Whitefly is an orchid species with thin cuticle on the leaves, and the stinging mouthparts of adults and larvae are inserted from the back of the leaves to suck the tissue juice and make the leaves yellow.

Prevention and control methods: spraying deltamethrin, 20 times of 20 times of dichloride, etc. Take the drug 2-3 times in a row, 5-6 days apart.

Snails and slugsSnails and slug mollusks are often found in damp and dark orchid greenhouses, and come out at night to eat young leaves, young roots and flowers of orchids. Due to the large amount of food, the harm is heavier. Prevention and control methods:

Spray trichlorfon around orchids, benches and pots, or sprinkle quicklime and saturated salt water. Pay attention to the cleanliness and hygiene in the greenhouse, and remove dead branches and leaves in time. <>

Scale insects are the most common insect pest of orchids and are mainly parasitic on stems and leaves. It is very fertile and can reproduce for several generations in a short period of time. And there are many types of scale insects, including shield scale, striped mealybug, mulberry white shield scale, and chaff shield scale.

Let's talk about orchid stem rot.

Raising orchids, usually maintain and avoid these 3 points, there are many fewer pests and diseases!

1. Cigarette butts: tobacco leaves contain about 3% nicotine. Nicotinoid has a strong contact killing and stomach toxicity effect on pests.

Take about 20 leftover cigarette butts and a portion of quicklime, stir and soak and filter with water, and then add 30 parts of water to spray orchid plants, potting soil and pot bottoms with them, which can eliminate ants and other wax-free pests;

2. Laundry detergent and detergent: Laundry detergent can dissolve the cornea of scale insects, and at the same time form a layer of foam to wrap the insect body, so that the scale insects can suffocate and die of locust chop. Laundry detergent solution can control some pests and diseases;

3. Tea bran: also known as tea withered and tea seed cake, it is the residue left after the tea seed oil is extracted, and farmers often use it to wash clothes. Chachai bran contains saponin and glycosides, and its water extract is alkaline, which has a good stomach toxicity and contact killing effect on pests.

Orchid is a more common flower plant in life, and has a high ornamental value, loved by most people, but many people want to know what orchid pests and diseases are, because people in the process of breeding, often encounter some pests and diseases that cause plants to wither, so not timely treatment will lead to the death of plants, the following will follow me to understand the common insect pests and control methods of orchids.

1. Anthrax

This is one of the most common diseases of orchids, in the early stage of the disease will cause obvious small black spots on the plant, and then it will continue to expand, knowing that the leaves of the plant are all forming irregular diseases, and in severe cases, the disease spots will also appear anthracnose, which will affect the normal growth of plants.

2. Scale insects

Almost all plants will be infected with this pest, especially in summer, the weather will be more serious, if coupled with indoor air circulation, plants will easily appear scale insects, and scale insects reproduce very quickly, serious cases will lead to the death of the whole plant.

3. Nematode disease

Nematodes parasitize the roots of orchids, causing root rot, poor growth of aboveground leaves, green and yellow leaf color, and even plant wilting. Nematode damage causes a large number of wounds, and also causes the infection of other soil-borne pathogens, which leads to plant disease and accelerates plant death.

4. White silk disease

The disease is most severe when watered too wet or poorly ventilated, especially when newly planted seedlings are most susceptible. The infected area will produce brown lesions, which will expand rapidly in a high temperature and humidity environment, and eventually appear black brown spots, if the flower friends encounter this situation in the process of breeding, it will lead to the death of the whole plant if it is not treated in time.

1. Peculiar vegetables

Peculiar vegetables have their own peculiar smell, and their smell can play a role in insecticide. Commonly used off-flavor vegetables in the family are green onions, garlic, leeks, ginger, onions, etc., take an appropriate amount of off-flavor vegetables. Mash it into juice, mix it with less water, and spray it directly with the orchid plant.

It can treat aphids, red spiders, scale insects and gray mold.

2. Ointment application method

For local patients such as orchid black spot disease, if you are reluctant to remove the whole leaf, you can use the topical ointment application method, the specific method is to apply Tobuzin powder with water and paste to the patient, wipe off and reapply every other week, which can minimize the development and expansion of the patient.

3. Cigarette butts are insect proof

Tobacco contains nicotine, has a killing effect on pests, only use more than 20 cigarette butts and a portion of quicklime, add water and stir evenly, soak overnight, and then filter, add 30 times the water, use it to spray the orchid plant directly, spray the bottom of the pot can also eliminate ants and other pests.

Conclusion:Through the above detailed introduction, I believe you already know what are the orchid pests and diseases, in fact, there are many common orchid pests and diseases, and the harm to the plant is also relatively large, if people are not careful in the process of breeding, this disease will appear, so flower friends can follow the above orchid common pests and control methods to prevent.