Symptoms: the lesion appears on both sides of the front and back of the leaf, nearly round, brown to dark brown or dark gray brown in the middle of the lesion, surrounded by dark brown or near black thin line circle on the edge, light brown on the back of the leaf, and light olive colored mold on both sides of the lesion, i.e. pathogen fruiting body. After the disease spots fused, the leaves turned brown and yellow or the plants died.
Prevention and control: when potting, change the pot every spring and remove the diseased leaves in time. Spray prevention and treatment at the early stage of the disease.
Symptoms: the main damage to the leaves of daisy, in the early stage of the disease, there will be many small green spots on the leaves, gradually expanding.
Prevention and control: prevention and control must be carried out in the early stage, and it will be difficult to cure the spread of bacteria if it is delayed for a long time. We can use 1500 times of 50% Benazolin wettable powder to spray the plants for control.
Symptoms: the insect is about 6-11mm long, cylindrical and black in color. At the beginning, it will lurk in the root of daisy, and then gradually nibble up from the root. At the later stage, it will make the plant wither due to lack of nutrients.
Prevention and control: the best time to prevent and control this kind of insect pest is when we divide the daisy into branches. We need to dig out the root of the plant and check whether there is insect pest. If it is found, we can use 200 times of 50% dichlorvos emulsion to spray directly.
Symptoms: this kind of insect damage mainly harms the leaves of daisy. In the early stage, the leaves will shrink, and finally spread to the plants, leading to withering and death.
Prevention and control: in case of this kind of insect pest, we must deal with it as soon as possible. The most direct way is to spray the whole plant with 1000 g of 75% phorate emulsifiable concentrate. It is usually sprayed once every 7-12 days, and it can be basically removed after two or three times.
Symptoms: the cicada is generally 7-8mm long, with brown head and blue body. It mainly damages the leaves of plants, sucks the sap of leaves and makes them yellow and wither.
Prevention and control: you can choose to use light to trap and kill, but it is difficult to completely remove. The most direct and effective method is to spray 50% methamidophos emulsifiable concentrate 1000 times to kill the pest directly.
