Greenhouse flowers must be protected against four pests

First, anti-freezing damage: for flowers that are not cold-resistant, grass curtains should be added at night or small sheds should be set in the shed; you can also dig a storage pool every few meters in the center of the greenhouse to keep warm by using the storage tank; or sprinkle some plant ash on the ground, generally can increase the ground temperature by 1 ℃ ~ 2 ℃.

Second, prevent moisture damage: when there are more rainy and snowy days, the greenhouse is closed for a long time, and drainage ditches should be opened outside the shed to reduce soil moisture. In addition, some plant ash can be sprinkled on the ground to absorb heat and increase temperature, absorb moisture and reduce humidity. At the same time, we should pay attention to tightening the greenhouse film and strictly prevent the roof from stagnant water and leakage.

Third, prevention of gas damage: fully mature organic fertilizer should be applied in the greenhouse to reduce the amount of chemical fertilizer as much as possible. In sunny and windless weather, it should be ventilated and ventilated in time to exhaust harmful gases from the shed.

Fourth, disease prevention: the air humidity in the greenhouse is high, so special attention should be paid to preventing diseases such as powdery mildew, black spot, anthrax and so on. Anthracnose can be controlled with 75% chlorothalonil at the initial stage of the disease, powdery mildew can be sprayed with 1 ∶ 1 ∶ equivalent Bordeaux solution, and black spot can be controlled with 1000 times thiophanate methyl. The use of drugs in the shed should avoid the high temperature period and flowering period at noon on sunny days.