What are the main diseases and insect pests in Magnolia cultivation?

What are the main diseases and insect pests in Magnolia cultivation? How to prevent and cure it? Please introduce the main diseases and insect pests in Magnolia: 1. The methods of prevention and control of anthracnose are as follows: (1) strengthen the management of water and fertilizer, increase the application of organic fertilizer and enhance the disease resistance of plants. (2) cut off the diseased leaves on the tree in time, clean the diseased and withered leaves on the ground, concentrate and bury them deeply, and reduce the source of infection. (3) at the initial stage of the disease, 84.1% Dobao wettable powder and 77% Kesha wettable powder were sprayed every 15 days for a total of 2 times. Depending on the condition, spray 75% chlorothalonil wettable powder 600 × 1000 times solution and 70% anthrax Fumei 500 solution and 65% Dysen zinc wettable powder 500 times solution 50% carbendazim wettable powder + 75% chlorothalonil wettable powder 800 times solution 50% mixed sulfur suspension 500 times solution 70% methyl thiophanate ultrafine wettable powder 1500 times solution and so on. two。 Control methods of black spot: (1) strengthen nursery management, enhance tree potential and improve disease resistance. Select loose, fertile and well-drained soil, apply fully rotten cake fertilizer, loosen the soil and water in time, and pay attention to frost prevention in the north. (2) remove the fallen leaves on the ground in time, cut off the seriously diseased leaves from the trees, and concentrate on burying them deeply. (3) in the early stage of the disease, spraying 1purl 160 Bordeaux solution or 0.3~0.5Be stone sulfur mixture 77% can kill wettable powder, 30% king copper suspension, 25% ammonia copper solution, 50% trichlorothalonil wettable powder 600 times 800 times, 75% chlorothalonil wettable powder 800 times solution 70% methyl thiothalonil wettable powder 1000 times, etc., spray once every 10 to 15 days, 2 times in a row. 3. The control methods of diamondback moth are as follows: (1) combined with field operations such as pruning in summer (first generation area) and winter and spring (first generation area) to cut or break the cocoon. (2) cut off the leaves and kill the larvae when the young larvae are damaged by clusters. (3) spraying 20% dimethrin suspension 20% chlorpromazine 3 suspension or spraying Bt emulsion cyanobacteria in the whole larval stage. (4) when necessary, spray insecticides such as fenitrothion in the larval stage. Click for more magnolia planting techniques click to get more flower planting techniques