The main diseases that endanger the four seasons are:
1 stem rot. The potted stems of the four-year-old potted family rot, and then the base of the petiole rots, which is caused by stalk rot. At the time of initial onset, reddish-brown spots appeared on the surface of the cortex of the basal stalk, and then expanded into water-stained translucent plaques, which were connected together into pieces, extended to the base of the lower petioles, and finally rotted and lodging. Control methods: (1) Use soils with good permeability and adequate nutrients for cultivation. The organic fertilizer used must be fully decomposed. The maintenance site and basin soil should not be too wet or have accumulated water. In severe areas, the soil must be strictly sterilized and sterilized. Management should be reasonably placed, increase ventilation, so that the germs have no chance of survival.
2 At the beginning of the disease, 70% of dexamethasone WP, or D-801 powder or 75% chlorothalonil WP can be sprayed 600 to 800 times, once every 7 to 10 days, and sprayed continuously for 2 to 3 times. Suppresses the progression of the disease.
3 gray mold. The main hazard stems, leaves, flowers. Watery spots began to appear after the disease began, and after the emergence of gray mold, serious plant death will result. Control methods: Cultivation environment pay attention to ventilation and light, not too much watering. At the beginning of the disease, 800 times 50% carbendazim was sprayed.
4 powdery mildew. The main damage to young leaves and pedicels, began to appear white powdery lesions, grayish-brown, curled leaves, coke, small and small flowers. Control methods: Spray 2000 times liquid 25% triadimefon at the early stage of disease.
5 Blight. Occurred mainly in the seedling stage, pathogens invade the roots and shoots of the seedlings from the surface of the soil, causing brown lesions in the early stages of the damage, and subsequent death of the rotted shoots. Control methods: Once it is found that immediately with the 800 times liquid 65% dixon watering rhizome parts, or with 600 times solution Zezin spray, spraying once every 10 days, and even spray three times.
6 Nematode disease. The main damage to the roots resulted in the roots producing yellow-white nodules, which shortened the internodes of the plants, resulting in smaller leaves and severe death. Control methods: pots and soils need to be disinfected before use.
7 bacterial spot disease. The main damage leaves. Symptoms began to appear small brown spots, and later expanded into water spots lesions, severe leaves will wither. Control methods: timely removal of diseased leaves and burning, spraying 5000 times streptomycin.
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