Prevention and control measures of lily diseases and insect pests

The main results are as follows: (1) when planting lilies in rotation for 3 years, lilies should be planted from bottom to top to reduce the spread of bacteria.

(2) the bulbs without disease, mite and mechanical injury were selected as species to reduce the source of bacteria and mites.

(3) to burn the litter, the remains of diseases and insect pests in the field and reduce the source of diseases and insect pests. The organic fertilizer was compost and fermented and then applied to the lower layer of the soil.

(4) Deep ditch and high border, clear ditch and drain, and control soil water content.

(5) impregnation and disinfection to kill mites. Before sowing, soak the bulb for 5 minutes with 4000 times solution of 20% thiophanate wettable powder and 1000 times solution of methyl topiramate for 5 minutes (when the temperature is above 30 ℃, the time is shortened to 3 minutes) to kill bacterial mites.

(6) chemical control in the field. According to the experiment and investigation, the prevention and control of pesticide in the field is the most important, and it is expensive in the early stage, and the continuous use of medicine for many times can be effective. When sowing, use 10% zinc and phosphorus powder plus 50% dimethyloxone wettable powder 2kg or 50% methyl topiramate wettable powder 0.5kg per mu to make medicinal soil, put it in the sowing ditch, then sow and cover the soil; in the first and middle of April, drench with 3000 times of 20% acaridin wettable powder or 1500 times of isocarbophos EC plus 1500 times of bacterial detergent or 1500 times of dimethophos wettable powder. Drenching should be carried out in sunny or cloudy days when there is no water in the soil, and hoe the topsoil layer before application, otherwise, the effect will be poor and affect the normal growth of lilies. A total of 2-3 times, each time at an interval of 15 murals for 20 days. Spraying protection began from the emergence of lily seedlings, applied once in 15 days, sprayed 6-7 times in succession, and carried out alternately. In addition, 50% mancozeb wettable powder 700 times liquid and 75% chlorothalonil wettable powder 700 times liquid can also be used.