How to prevent and treat flower diseases? The key is to treat the root cause

To prevent and treat flower diseases, you must first understand the causes of the disease, the infection cycle and its ecological environment, and grasp the patterns of when, where and to what extent the damage occurs, so that you can treat the root cause.

1. Medication for non-infectious diseases

① Sunscald damage: the middle of the upper leaves of the plant looks scorched, appearing light red, but the damaged area shows no mold growth after rain.

② Waterlogging damage causes root rot and makes plants prone to lodging. With frost damage, the leaf margins of seedlings dry out and curl up first, the damaged area shows no mold growth after rain, and the stem bark splits.

③ Drought damage causes the middle and upper leaves to wrinkle and droop.

④ Pollution damage makes leaves dirty, but they wipe clean easily. Fertilizer damage causes young buds to wilt and growth to stagnate.

⑤ Nutrient deficiency damage causes slow plant growth, deformed and lusterless leaves, and leaves dropping from the bottom upward along the stem.

The above diseases are physiological disorders, and pesticides cannot help; they can only be solved by changing the ecological conditions, while foliar fertilization should also be used as a remedy.

2. Medication for infectious diseases

① Fungal diseases: leaves often show white powder, rust powder, sooty mold, mold layers and blotches, and after rain the underside of the lesions often has mold-like fungal spores. For this disease, zineb or cymoxanil can be used for routine control. At the peak of the disease, amobam, carbendazim and others can be used alternately, with dilution concentrations of: 500-800 times liquid for powders, and 800-1000 times liquid for emulsifiable concentrates or aqueous solutions.

② Bacterial diseases mainly harm rhizomes, corms, bulbs, tubers and so on. Under dry conditions the damaged parts become powdery, and under high-temperature conditions they become water-soaked. For this disease, you can choose 30 grams of agricultural streptomycin at 200,000 units and add 50 kg of water for spraying or watering.

③ Viral diseases manifest as mosaic, necrotic spots, ring spots, leaf yellowing, deformity, witches' broom, and shedding of upper leaves. You can choose 20 tablets each of oxytetracycline and moroxydine hydrochloride, dissolve them in 12 kg of water and spray or water with the solution, or boil 2.5 kg of Radix Isatidis and spray or water with the decoction.