Symptoms: the disease is serious from September to November, when the high temperature and humidity promote the occurrence of the disease. After the disease, the plant grows short, causing the surface of the leaves to become uneven and even curly. After some flower buds are damaged, they can not bloom, or abnormal flowers are produced. After serious disease, the leaves can dry up, even the whole plant dies.
Prevention and control: generally, it is necessary to strengthen the maintenance, promote the growth of the plant, and improve the ability of disease resistance. We should also control the application of water and increase the application of phosphate fertilizer. After the onset of the disease, it is necessary to remove the disease leaves in time, and then spray zein or TOBU spray to prevent and cure it.
Symptoms: most of them occur from flowering stage to flowering stage, and are easy to occur when the soil humidity is relatively high and the soil temperature is relatively high. When the petals were damaged, the diseased spots began to turn green, then turned yellow brown, and showed irregular shape after expansion.
Prevention and control: when planting, strengthen ventilation and light transmission between plants, pay attention to fertilizer supplement in the later stage, and apply a little more phosphorus and potassium fertilizer. Spray 0.5% Bordeaux every 7-10 days after the bud appears.
Symptom: This is one of the main pests. The larva will get into the stem. When the damage is very serious, the plant will not blossom, or even be directly disabled.
Prevention and control: from June to September, spray 90% trichlorfon technical 800 times every 20 days or so, which can kill the newly hatched larvae.
