How to maintain orchids in summer and autumn

Orchids native to the valley under the forest, sexual shade, afraid of the sun; avoid extreme heat, dry, requires a well-ventilated environment. According to this growth habit, the conservation of orchids in summer and autumn should pay attention to four points:

Shading and ventilated orchids should be shaded from early summer to the end of September, and the shade should not be less than 70%. When shading, a large amount of sunshade net is used, and a small amount is placed on the north balcony and under the eaves. During this period, the plants should be sparse, and the pots and pots should not be less than 10 cm. Under the basin, it is best to use bricks to support it, increase the ventilation rate, and make it ventilated. In addition, it is also necessary to prevent the pollution of harmful substances such as sulfur dioxide, hydrogen fluoride and dust to promote its robust growth.

The suitable temperature for cooling and humidifying orchid is 20 ℃-28 ℃. The orchid grows rapidly above 25 ℃. When it exceeds 32 ℃, it is forced to enter the dormancy period and the growth is in a stagnant state. When the temperature reaches 30 ℃, it is necessary to take measures of cooling and humidification. Open-air cultivation, can be on the ground covered with river sand or plastic film, raised on the balcony, under the basin pad sponge, often keep moist. Spray the plants many times a day and sprinkle water on the ground. Indoor cultivation can be with the help of air conditioning or electric fan. Try to keep the temperature below 30 ℃ and keep the air humidity above 70%.

Watering and fertilization at present, most of the orchids are cultivated in soil, and most of them are potted. Pot soil moisture should adhere to the "moist but not wet, dry but not dry" principle, watering should be carried out when the topsoil is slightly white, do not overwatering, resulting in rotten roots. From midsummer to early autumn, it is generally watered once in the morning, and watered as appropriate in the evening depending on the degree of dryness and wetness of the basin soil. If the basin soil is found to be dry after noon, water should be replenished at any time. After mid-autumn, although the climate is getting cooler, but the air is dry, according to the requirements of "autumn is not dry", it is appropriate to keep the basin soil moist. Fertilizing orchids should be based on the principle of small amount, thinness, frequent watering and timely, especially in summer and autumn. Fertilization should be applied according to different orchid species and different growth stages from May to September. For the orchid plants in the dormant period or when the temperature is above 30 ℃, the fertilization will be suspended. Liquid fertilizer is usually applied once every 20 days, the ratio of fertilizer to water is 1:10, and solid fertilizer is used indoors. Multi-purpose chemical fertilizer is produced on a large scale, and the concentration is about 0.1%. The concentration of foliar fertilizer spraying is prepared according to the product description.

Disease prevention and insect control orchid is a plant with many diseases and insect pests, especially in high temperature and humidity season. The peak period of anthracnose is from June to September, and carbendazim and topiramate have better control effect. White silk disease was drenched with chloramphenicol injection 500ml 1000 times, once a day, twice a day, which can control the disease. Scale insects are the archenemy of orchids. Adults are removed manually. Larvae hatch from May to June and are sprayed with drugs. Aphids and whiteflies are sprayed with 500 times of 10% wettable powder for 2 consecutive times.