What are the common pests of magnolia? A detailed introduction to the main species

Magnolia pests include:

I. Cicadas

Cicada nymphs suck the sap from the roots of the flowers in the soil, while adults pierce and suck the sap from the main leaves. Females insert their ovipositors into the branches to lay eggs, causing the branches to die.

Control methods:

1. Promptly kill the mature nymphs that have just emerged from the soil.

2. If the infestation is severe, you can light a fire near the tree trunk on a hot summer night, shake the branches so the cicadas fall into the fire and are killed, and kill the cicadas that fall outside the fire.

3. Apply boiled sticky tung oil or a sticky ball kneaded from spider webs to the end of a bamboo pole to catch the adults.

4. From April to August, inspect promptly and prune off the egg-laying branches.

II. Red wax scale

The nymphs and adults of the red wax scale suck the sap of the flowers, and their excrement often induces sooty mold, causing a layer of black mold or a thicker black film to form on the leaves. The whole plant becomes a black tree, the plant weakens, and it rarely blooms or cannot bloom at all.

Control methods:

1. In winter and early spring, remove some heavily infested branches while pruning.

2. If there are few or short infested flower plants, they can be removed manually in winter and spring.

3. During the peak hatching period of the nymphs, spray 25% phosmet emulsifiable concentrate at 1000 times dilution, or 40% omethoate emulsifiable concentrate at 1500 times dilution, once every 4 to 6 days, for 3 consecutive sprays.

4. When introducing flower seedlings, strictly quarantine them to prevent bringing in the pests.

III. Cottony cushion scale

Control methods:

1. Manual control. Use your hands or tweezers to remove the females and egg sacs, or prune off the heavily infested branches and leaves.

2. Biological control. Introduce natural enemies such as the vedalia beetle and the Australian ladybird to prey on the cottony cushion scale. Chemical control. During the dispersal period of newly hatched nymphs, spray 40% omethoate at 1000 times dilution, or 50% fenitrothion at 1000 times dilution, or ordinary laundry detergent at 400 to 600 times dilution, once every 2 weeks, for 3 to 4 consecutive sprays.

IV. Red spider mites

Control methods:

1. Soak citrus peel in 10 times its amount of water for a day and a night, filter, and spray on the plants.

2. Mix 15 g of laundry detergent, 15 ml of 20% caustic soda, and 7.5 kg of water, then spray the plants.

3. Add 50 g of plant ash to 2.5 kg of water, stir thoroughly, soak for two days and nights, filter, then add 3 g of laundry detergent and mix well before spraying. Spray once a day for 3 consecutive sprays, then after 1 week spray 3 more times. This can eliminate the second generation of pests; when put into the soil, it can control maggots.

4. Light 1 mosquito coil and place it in the pot of the diseased plant, then tie a plastic bag tightly around the pot. After 1 hour of fumigation, it can kill the eggs and adults.