In summer, peony enters the period of rapid growth of the leaves, the color of the leaves is deepened, turns green or dark green, and the leaves increase rapidly and thicken. At the same time, the scale buds entered the period of growth and differentiation, and scale buds were formed in late May. The primordium has been fully formed in July or August. Whether the summer maintenance work is done adequately will directly affect the flowering situation in the coming year. Based on the characteristics of Beijing's summer climate, the author elaborates on several key issues and solutions for summer peonies conservation management in combination with their actual work. First, to prevent the lack of fertilizer within two months after the application, to apply a fertilizer based mainly phosphate fertilizer, but also can be properly applied to some fermented by the farmyard fertilizer. If the growth of plants after flowering is not good, 0.2% potassium dihydrogen phosphate solution can also be used for foliar dressing, so that plants can flourish. Second, timely watering Watering usually once every seven or eight days, watering in the early morning or evening. It is necessary to keep the soil moist and not too wet, but not to collect water. Third, to prevent disease in high temperature and high humidity environment, the most prone to peony brown spot, gray mold and other leaf diseases. Find out the condition, identify the type of disease in time, and take appropriate measures. 1. Brown spot disease, also known as erythema, often causes premature leaf failure and affects the growth of peony. To completely remove the diseased body, spray 50% carbendazim 600 times or 3 degrees lime sulfur to kill the bacteria on the plant. After onset, spray 50% carbendazim 1000 times or 65% dexamethasone five or six hundred times, spray once every 7 days to 10 days, spray three or four times in succession. Appropriate planting density, organic fertilizer and compound fertilizer. 2. Anthrax More diseases occur in Beijing, Nanjing, Shanghai, Wuxi, Zhengzhou and Xi'an. Anthracnose often causes the leaves of peony to be conjunct, the diseased stem is twisted, and young shoots die. Minimize the source of infection. At the beginning of the disease, 70% of anthrax and 500ml of anthrax or 1% of lime are used, or 65% of dexamethasone is 500 times of liquid, and sprayed once or twice a day for 10 days to 15 days. 3. Round spot disease, also known as white spot disease, is a common leaf spot disease in peony, and is more severe in Beijing, Changsha, Zhengzhou and Guiyang. The defoliation of diseased plants was removed in time, and 3 degrees lime sulfur was sprayed before germination to kill the bacterium on the peony plants. After the onset of illness, spray 1% lime equivalent Bordeaux fluid or 50% Tuzet 800x fluid or 65% Zeoxin zinc 500x fluid, spray two or three times in succession and spray once every 10 days to 15 days. Prune dead branches and dense leaves in time to improve ventilation and light transmission. 4. Botrytis cinerea The disease can occur in the growing season of peony, causing serious damage to young plants, causing lodging and withering. The litter of diseased plants was removed and the diseased body was buried deeply. Once the onset of the disease can be sprayed with the following agents: 1% lime equivalent Bordeaux, 70% thiophanate-methyl 1000 times and 65% on behalf of Zinc 500 times, spray every 10 days to 15 days, continuous spray Two or three times. After the rain, drain the water in a timely manner. Do not wet the soil at the base of the cluster.