It is necessary to prescribe the right medicine for the control of flower diseases.

The prevention and control of flower diseases should first understand the causes of the diseases, infection cycle and ecological environment, and master the time, location, scope and other laws of the harm.

1. Drug use of non-infectious diseases

The middle part of the upper leaf of the plant burned by ① was light red, but there was no mildew in the damaged part after rain.

② waterlogging damage will lead to rotting roots and easy lodging. The leaf edge of the seedling damaged by frost was dry and scorched and wrinkled first, and there was no mildew in the affected part after rain, and the stem bark was broken.

③ drought caused wrinkling and drooping of the middle and upper leaves.

④ pollution makes the leaves dirty and easy to clean. Fertilizer causes wilting of buds and stagnation of growth.

The growth of plants damaged by ⑤ deficiency was slow, the leaves were deformed and dull, and the leaves fell off from the bottom to the top along the stem.

The above diseases are physiological diseases, pesticides are powerless, can only be solved by changing the ecological conditions, and should be remedied by combined with extra-root fertilization.

2. the use of drugs for infectious diseases

There are often white powder, rust powder, coal stain, mildew layer and plaque on the leaves of ① fungal disease, and fungal spores are often found on the back of the disease spot after rain. Dysen zinc and frost bengling can be selected for routine control of the disease. In the peak period of the disease, benzoammonium and carbendazim can be used alternately, and the dilution concentration is 500-800 times of powder and 800-1000 times of EC or water.

② bacterial disease mainly harms rhizome, corm, bulb, tuber and so on. The damaged parts are powdered under dry conditions and waterlogged under high temperature conditions. The disease can be sprayed with 200000 units of agricultural streptomycin 30 grams plus 50 kilograms of water.

The diseases of ③ virus were mosaic, withered spot, ring spot, leaf yellowing, deformity, arbuscular branch, upper leaf shedding and so on. You can choose 20 tablets of oxytetracycline and 20 tablets of virulent, dissolved in 12 kg of water or boiled with 2.5 kg of Banlangen.