Key points of Prevention and Control of Stem Blight of Carnation

Prevention and treatment methods: (3) before the onset of the disease, 40% biguanidine octane benzene sulfonate wettable powder was sprayed with 1000-fold solution, once every 7 days, for 4 times; at the initial stage of the disease, 50% carbendazim wettable powder, 80% carbendazim wettable powder, 80% carbendazim wettable powder and 12.5% uniconazole wettable powder were sprayed 2000-3000 times.

Control techniques of stem blight of carnation

Main points of identification: stem blight of carnation affects the root, stem and leaf sheath of the plant. The diseased part turned brown, the leaves withered and yellowed from bottom to top, the stem dried up in the earth, and the stem pith turned brown and rotten.

Occurrence characteristics: the pathogen is fungus. The pathogen overwintered in the soil as chlamydospores or mycelia in the diseased remains, and formed brown disease spots at the root and stem base of the infected plants in the following year, then gradually expanded and expanded to the pith, resulting in the gradual death of the plants due to the obstruction of nutrition and water transport. The disease was more obvious in sunny days after continuous overcast and rain.

Prevention and control methods:

(1) use mature compost to avoid excessive application of nitrogen fertilizer, and control watering after seedling survival.

(2) 75% pentachloronitrobenzene wettable powder was mixed and applied around the root at 1:40.

(3) before the onset of the disease, spray with 40% biguanidine octane benzene sulfonate wettable powder 800 / 1000 times, once every 7 days for 4 times; at the initial stage of the disease, use 50% carbendazim wettable powder 500 / 1500 times, 80% carbendazim special wettable powder 800 / 1000 times, 12.5% uniconazole wettable powder 2000 / 3000 times spray.

Prevention and control of blight of carnation

Key points of identification

The disease occurred in the seedling stage of carnation, the stem produced oval dark brown disease spot and sunken; after the development of the disease, the disease spot expanded, it could circle around the young stem, the disease part constricted, and the stem and leaf withered and died above the disease spot; in the middle and later stage, the stem of the diseased plant appeared brown ring spot, then turned to withered white, and the leaves were withered and yellow. When the humidity is high, the disease spot grows out of the hyphae, the hyphae is arachnoid brown, and sometimes irregular brown sclerotia can be seen. When using seeds to propagate and be infected, it can cause rotten seeds not to emerge.

Occurrence characteristics

Fungal diseases in seedling stage. The pathogen is Rhizoctonia. Under suitable temperature and humidity, the hyphae invaded the host and spread with Rain Water, irrigation water and agricultural operation. It often occurs when the seedlings are too dense, too long, and the humidity management of the seedling bed is unreasonable.

Prevention and cure method

(1) choose a disease-free seedling bed with good drainage, and thoroughly disinfect the bed soil. The potted soil for family flower cultivation can be disinfected at high temperature; in fields and greenhouses, formaldehyde can be fumigated by spraying 40 ml formaldehyde and 2-4 liters of water per square meter 20 days before sowing, and immediately sealed with film for a week.

(2) at the initial stage of the disease, 75% chlorothalonil wettable powder, 50% carbendazim wettable powder and 20% flurosemide wettable powder 2000 times were sprayed.