How to control common diseases of Oncidium when leaves turn yellow and black

Orchid is a very valuable flower plant with elegant posture and beautiful flowers, but the orchid is beautiful and delicate and needs careful maintenance. Oncidium is a variety of orchids, beautiful and enchanting, but it also needs patient maintenance and management. if it is not properly maintained, it is easy to cause the symptoms of yellowing and blackening of leaves, so how should we deal with this symptom if we really encounter this symptom?

What if the leaves of Oncidium turn yellow and black?

1. Improper watering

Watering should master skills, watering should be carried out according to the drying condition of the basin soil, and the right amount should be watered at the right time. Avoid basin soil being too dry or too wet. Pay attention to the air humidity in the growing environment of Oncidium. If the air is too dry, spray water frequently to maintain humidity.

2. Improper fertilization

In terms of fertilization, Oncidium needs thin fertilizer to apply skillfully, and must not apply thick fertilizer, big fertilizer and unrotten liquid fertilizer. On the second day after fertilization, clear water should be irrigated once to dilute the fertilizer and avoid fertilizer damage.

3. Lighting

Oncidium likes to be semi-overcast. In addition to full sunshine maintenance in early spring and winter, put the plants in a well-ventilated place at other times to avoid direct sunlight.

Control methods of common diseases of Oncidium

1. Wenxin orchid leaf disease

Oncidium infected with mosaic disease, at the beginning of the leaves will appear yellowish discontinuous spots, the emergence of mosaic. Then the disease spot will lead to leaf necrosis, forming sunken brown necrotic spots on the leaf, and the leaf will gradually die.

Solutions: reasonable ventilation, avoid high temperature and humidity environment; control watering, appropriate application of phosphorus and potassium fertilizer; timely removal of diseased plants and diseased leaves. In addition, when you get sick, you can choose Bordeaux solution, methyl thiophanate solution, chlorothalonil, etc., spray once every 7-10 days, spray 2-3 times.

2. Botrytis cinerea

It mainly harms leaves and petals. At the initial stage, there are small water-like spots on the petals, and then gradually expand the round brown spots in the city. The plaque gradually expanded in the form of spots. However, due to the differences in varieties and maintenance conditions, the color of the disease spot will be different, and in severe cases, the disease spot will expand or even cover the whole petals, causing the flowers to wither. In indoor farming, gray moldy layers appear on leaves and petals.

Solution: timely ventilation, keep the environment dry, avoid the production of bacteria. Spray chemicals in time when you get sick and do a good job of prevention.

3. Anthracnose of Oncidium

When the disease occurs, the leaf tip will produce small yellowish round spots, and then gradually expand into dark brown. Several adjacent disease spots combine with each other, resulting in the death of the leaves.

Solution: pay attention to the watering method, do not water directly from top to bottom, be close to the soil, do not have stagnant water in the leaf center, keep the leaves dry at night; inevitably rain, properly shade, and ventilate in time; spray medicament in time to prevent the disease.

Pruning methods of Oncidium

Prepare disinfection supplies (alcohol, clean cloth), disinfect the scissors, leave them in a cool place to dry and trim.

Trim the ear of Wen Xin and cut off the growing flower stalk. According to the growth of the plant, cut off the thin, poorly growing branches to avoid consuming too much nutrients.

Too dense and withered branches should also be cut off. Oncidium has more flowers and will not bloom at the same time. When some flowers bloom, some flowers have withered or turned brown, so cut off these withered flowers in time. Avoid affecting flowering.

When changing the basin, the rhizome should be trimmed. Oncidium is a fleshy root. Too much watering during the growth period or impermeability of the soil will lead to root damage and affect growth. Therefore, it is necessary to change the basin and turn the basin to trim the root in time. In the process of pruning, in order to ensure safety, the tool can be sterilized every time it is trimmed.

When will Oncidium blossom

The flowering period of Oncidium is generally in the middle of October every year, and its flowering period is relatively short, beautiful and beautiful, and there are many varieties of flowers, which are very ornamental.

However, because of various species and different growing areas, the florescence is different and there is no fixed florescence. Oncidium is an important raw material for potted flowers in the world.

As mentioned above, in fact, not only orchids, there are many precious and delicate flowers and plants need careful care, because behind these beautiful and noble gardeners' hard care, of course, there is a very good return after hard work!