What are the main pests and diseases in magnolia planting?
What are the main pests and diseases in magnolia planting? How should they be prevented and controlled? Please give an introduction. The main pests and diseases in magnolia planting are: 1. Anthracnose. Prevention and control methods: (1) Strengthen water and fertilizer management, apply more organic fertilizer, and enhance the disease resistance of the plants. (2) Timely prune diseased leaves from the trees, sweep up diseased and withered fallen leaves on the ground, and bury them centrally and deeply to reduce infect...
What are the main pests and diseases in magnolia planting? How should they be prevented and controlled? Please give an introduction.
The main pests and diseases in magnolia planting are:
1. Anthracnose prevention and control methods:
(1) Strengthen water and fertilizer management, apply more organic fertilizer, and enhance the disease resistance of the plants.
(2) Timely prune diseased leaves from the trees, sweep up diseased and withered fallen leaves on the ground, and bury them centrally and deeply to reduce sources of infection.
(3) At the early stage of the disease, spray 84.1% Haoduobao wettable powder and 77% Keshade wettable powder or 1:2:200 Bordeaux mixture, etc., spraying once every 15 days for a total of 2 to 3 sprays. After that, depending on the condition of the disease, choose to spray 75% chlorothalonil wettable powder 600 to 1000 times solution and 70% anthracnose thiram 500 solution and 65% zineb wettable powder 500 to 800 times solution, 50% carbendazim wettable powder + 75% chlorothalonil wettable powder 800 times solution, 50% hunshaliu suspension concentrate 500 times solution, 70% thiophanate-methyl ultra-micron wettable powder 1500 times solution, etc.
2. Black spot prevention and control methods:
(1) Strengthen nursery management, enhance tree vigor, and improve disease resistance. Select loose, fertile soil with good drainage, apply fully decomposed cake fertilizer, loosen the soil and water timely, and in the north pay attention to preventing frost damage.
(2) Timely remove fallen leaves on the ground, prune severely diseased leaves from the trees, and bury them centrally and deeply.
(3) At the early stage of the disease, spray 1:1:160 Bordeaux mixture or 0.3 to 0.5Be lime sulfur mixture, 77% Keshade wettable powder, 30% copper hydroxide suspension concentrate, 25% copper-ammonia complex aqueous solution, 50% tuijunte wettable powder 600 to 800 times solution, 75% chlorothalonil wettable powder 800 times solution, 70% thiophanate-methyl wettable powder 1000 times solution, etc., spraying once every 10 to 15 days for 2 to 3 consecutive sprays.
3. Yellow stinging caterpillar prevention and control methods:
(1) In summer (1-generation area) and in winter and spring (1 to 2-generation area), in combination with pruning and other field production operations, cut off cocoons or pull off cocoons.
(2) When young larvae gather to cause damage, cut off the infested leaves and kill the larvae.
(3) At the young larval stage, spray 20% diemieling suspension concentrate, 20% diflubenzuron No. 3 suspension concentrate, or throughout the entire larval stage spray Bt emulsion, qingchongjun, etc.
(4) When necessary, during the larval stage spray insecticides such as miesaoli, phoxim, fenitrothion, etc.
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