1. Symptom: it often occurs in the case of large planting area and poor ventilation, which endangers the leaves and stems of Berberis. In the early stage of the disease, yellow spots will appear on the leaves, and in the later stage, they will gradually expand into the spots with white powdery mildew layer on the surface. The disease spots gradually united and covered the whole leaf, which seriously affected the photosynthesis of the leaves, affected the metabolism of the diseased plant, and caused the premature senescence of the diseased plant.
2, prevention and treatment: when onset, we should immediately use three zolone to dilute 1000 times liquid to spray the leaf surface. Spray once a week, 2-3 times in a row to cure.
1. Symptoms: the disease is caused by the infection of P. In the early stage of the disease, there will be brown spots with different shapes in the diseased part, and in the later stage, the diseased part will gradually sink and the spots will gradually expand. The disease will eventually dry up and die, but it will not fall.
2. Prevention and control method: spray chlorothalonil or Carbendazim and other chemicals to the plant for prevention and control when the disease occurs, spray once every 7-10 days, and spray 2-3 times continuously.
1. Symptoms: this pest mainly damages the leaves of plants. Its adults and nymphs will live on the leaves and suck the juice, which will make the leaves yellow and the plant growth decline.
2. Control methods: once the scale insects are found on the leaves, they should be treated with promethrin or quick killing emulsifiable oil in time.
