Autumn management of orchids

Autumn, there are orchid friends need to understand orchid autumn management, autumn is another golden season for orchid cultivation, orchid growers should grasp the autumn climate characteristics, focus on adjusting light, changing pots and dividing plants, fertilizer and water supply, pest control and other work.

1. Increase light and increase temperature difference to promote bud and seedling.

Autumn sunshine can enhance the ability of orchid grass to resist pests and cold. Therefore, in autumn, shade should be reduced as much as possible, and orchids should be exposed to sunlight. At night, the windows of orchid room should be opened to allow them to be fully ventilated and increase the temperature difference between day and night. Orchid breeders all know that increasing orchid light in autumn and increasing temperature difference is a shortcut to promote bud and seedling growth. Orchids bloom more where there is more light in nature.

2. Water and fertilize.

In the autumn of drought without rain, more attention should be paid to watering moisture, such as low humidity can be sprayed to keep the environment moist, to prevent orchid leaf withered tip. After summer growth, most of the nutrients in the basin have been exhausted, so more attention should be paid to supplementing fertilizer in autumn. The method is to apply organic fertilizer once every 10 days, and spray nitrogen fertilizer on leaves once every 10 days. The two can be alternately carried out. In addition, in the root application of organic fertilizer at the same time, but also appropriate amount of phosphorus and potassium fertilizer, phosphorus fertilizer has the function of promoting orchid plant robust and flower bud differentiation, such as phosphorus deficiency in the plant material, the plant is generally difficult to flower, usually available 0.2% to 0.3% potassium dihydrogen phosphate solution for foliar spraying, spraying once every 5 days to 7 days, continuous spraying 2 to 3 times. Fertilization time should be selected in the orchid pot after the plant material is slightly dry, the temperature is lower than 30℃ sunny evening, the next morning should be watered once in time, in order to keep the pot soil moist and not stained as well, avoid pot soil too dry.

3. Pruning and finishing.

For summer and autumn flowering orchid, flowers should be cut off in time and supplement nutrients, in order to strong orchid plants. For orchids that grow luxuriantly and have not yet changed pots, the leaves of orchids should be sorted out in time. If the plants are too dense, some weak plants and diseased plants can be removed appropriately, and the diseased leaves, dead branches and burnt tail leaves can be cut off to promote the balanced and robust growth of orchids and maintain their ornamental nature.

4. Plant division and pot replacement.

Orchids are limited by flower pots, and the vigorous root groups are difficult to stretch, constantly arching to the pot surface, which brings difficulties to watering and fertilization. There are too many plants in the pot, which are airtight, which is not only vulnerable to pests and diseases, but also very unfavorable to the growth of orchids. In the face of such situations, pots can be changed. Summer orchid and autumn orchid in late October to mid-November is the appropriate period for pot change. When changing pots, turn out the mother plant, gently remove the mud, separate it according to the natural plant, trim the dead roots and residual leaves, and pay attention not to touch the leaf buds and fleshy roots. Wash the roots with clean water and put them in a cool place. When the roots are white and dry, put them in the basin.

5. Disease and pest control.

Autumn weather is suitable for the occurrence of various diseases and insect pests. Red spiders, scale insects, grubs and other pests are several main pests that harm orchids. A small amount of scale insects can be brushed with a brush, and a large amount of 40% dimethoate 800-1000 times liquid spray can be used for control. Red spider if not timely control, can make orchid leaves green scorched, with pollution-free pesticide green glume 500-600 times spray kill that is in addition. Grubs diving into flower pots will eat the fleshy roots of orchids. Serious damage can cause plants to wither. Root irrigation with 5% phoxim 1000 times solution can be used for control. Each time, 150 ml to 200 ml of solution is poured. In addition, autumn or orchid soft rot, stem rot, black spot and other high incidence season, can be used agricultural streptomycin, chlorothalonil, methyl thiophane and other fungicides alternately spray, not only spray orchid leaves, but also spray liquid medicine to surrounding areas.