1. Flower rot: in the case of high soil humidity and high temperature, it is conducive to disease prone. After the flower is damaged, it begins to turn green and then turns yellow brown. In the later stage, the disease spots will expand and darken. Bordeaux or tobuzin can be used.
2. Powdery mildew: it is very serious from September to November. The high temperature and high humidity environment will promote the occurrence of the disease. After being damaged, the plant is relatively small, the leaf surface becomes uneven, and the flower bud can not bloom after being damaged. In serious cases, it will cause the whole plant to die. Remove the disease leaves and control with ammonium spray.
3. Brown spot: it is easy to occur in rainy weather, which will cause brown spots on the leaves, then turn dark brown, and finally dry. Remove and burn the diseased leaves in time and spray lime sulfur mixture for treatment.
1. Dahlia dusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusdusjune to September, spray Technical .
2. Red spider: it causes small yellow and white spots on the leaves, and then turns red gradually, causing the leaves to curl and fall off. Spraying Trichlor fenolaec, Omethoate and other drugs.
