Ways to avoid rotten buds

With the rising temperature, most of the orchid plants have sprouted new shoots one after another. How gratifying! However, when some new buds grow to about 5-10 cm high, red necrotic plaques appear in the middle of them, and gradually expand until the whole new buds become scorched and blackened. Why is this?

(1) the bud sheath of the non-invasive soiled orchid is wrapped tightly around the bud leaves, so that the base of the whole new bud tip is in the shape of a closed tube. If too much water is deposited in the center of the tube, it is difficult to volatilize completely when the light is insufficient, the temperature is low and the air flow is slow. If the silting time is long, it is easy to produce waterlogging damage. The new buds of wild orchid plants are often rotten in the spring rain season. Therefore, when we collect wild orchid seedlings, we often find withered shoots. So what are the factors causing stain injury in domestic orchid sprouts?

The main results are as follows: (1) it is simply displayed outdoors without any orchid plants that cover Rain Water, and there is often stagnant water in the heart of the leaves during the continuous spring rain.

(2) for the orchid seedlings displayed in the greenhouse and greenhouse, the water vapor on the ground rises to the top of the greenhouse and drips into the heart of the new bud leaves after condensation.

(3) not paying attention to watering and fertilizing, pouring water and fertilizer into the heart of the new bud;

(4) when spraying pesticide and fertilizer outside the root, the fog point is too large, the spraying amount is too much, and the fertilizer and water flows into the center of the new leaf.

(2) external force injury

(1) accidental injuries in the management process of changing pots, collecting and trafficking, disinfecting and planting, watering and fertilizing, cutting off flowers and plants, fallen leaves, etc.

2. Injuries caused by collisions between mice, cats, birds and other animals

3. Inadvertently injured by foreign body. Although the damage caused by these external forces is not great, once injured, the damaged tissue will cause waterlogging damage.

(3) Infectious diseases lead to orchid bud rot, mainly bacterial soft rot. The disease mostly occurs in the middle and lower leaves, the spot appears yellowish green, water stains are transparent, and it turns into brown soft rot within three or five days. The lesion is irregular, with a clear boundary with healthy tissue, and there is an outflow of rotten fluid at the edge of the spot. In the later stage, the disease spot is dry and sunken, turning dark brown, and when it is serious, it makes the whole bud rot and wither.

(4) protective measures:

(1) the injury of water stains can be completely avoided as long as it is managed scientifically. For example, in the open-air orchid field, bamboo frame arches and plastic films are applied to prevent Rain Water from being soaked; in greenhouse and orchid rooms, attention should be paid to the convection and replacement of the air to prevent condensed water droplets from the roof from being injected into the heart of the new buds. Namely installs the suction exhaust fan, or sets the window, the gap ground opens the window, lets the air convection, adjusts the humidity in the shed, lets the orchid leaf, the dry wet is moderate. Watering fertilizer, spraying pesticides, the concentration should be moderate, the fog point should be fine, should be sprayed from the back of the leaf, at the same time, to the leaf surface non-dripping for the degree.

(2) for injuries caused by external forces, it is necessary to strengthen management, operate carefully and avoid them as much as possible.

(3) for infectious diseases, the emphasis is on prevention.

① pay attention to the environmental hygiene work in and around Lanchang.

② removes fallen leaves in time, sprays insecticides, and kills media.

(3) properly increase the application of phosphorus and potassium fertilizer, control the amount of nitrogen fertilizer, and pay attention to the application of multiple trace elements in order to increase the disease resistance of orchid plants.

④ does not use organic fertilizer that is not fully mature.

⑤ choose 600PPM streptomycin or oxytetracycline to spray orchid whole grass, pay special attention to spraying false bulbs and new buds, preferably around the whole orchid field, passages, orchid racks, orchid pots can be sprayed, if you can irrigate orchid soil, the effect is better. When the new buds are unearthed, once a week, more than three times in a row, rotten buds can be avoided.