How do you control pests and diseases such as sycamore mold spot disease, powdery mildew and tortoise wax scale?

As a plant lover, I seem to have feelings for most plants and rarely dislike any, but my feelings about the sycamore are rather complicated.

The sycamore gets its name because it bears round fruits that look like "hanging bells". The fruit balls can hang on the tree for a long time, lasting from the autumn fruiting season to the following spring and summer. During this period, whenever there is a strong wind, they will fall here and there, bursting with a "pop" into a ground full of yellow debris, and some are scattered directly on the tree by the wind.

The strong wind carries the yellow broken hairs and debris everywhere. It is fine if they land on hair and clothes, but they also like to get into the eyes, and many people are allergic to them, so naturally they are not likable.

But the sycamore still has its pleasing points: a majestic tree shape, dense branches and leaves, and lush green growth.

In autumn the leaves turn yellow and fall, and one step down brings a "creak" all around, which I quite like.

At the same time, it is also a world-famous excellent shade tree and street tree, known as the "king of street trees".

A good-looking tree should be given the utmost care.

Today the editor will introduce how to treat the sycamore after it gets sick.

Mold spot disease

It mainly harms the leaves of London plane. On the back of diseased leaves, many grayish-brown or dark brown mold layers grow, in a sticky state, and on the corresponding front side of the leaves, nearly round brown spots of varying sizes appear. In summer and autumn, seedling-grown young or overly dense plants suffer severe disease. Cutting seedlings and young trees are lightly damaged. However, the disease has not yet been found on large trees.

Control measures

1. Rotate crops for sowing and raising seedlings, or use the cutting seedling method. Repeated cropping for sowing and raising seedlings is strictly prohibited.

2. In autumn, collect the fallen leaves of the bed seedlings and burn them to reduce the overwintering source of bacteria.

3. Chemical control: From late May to July, spray Bordeaux mixture (1:2:200) 2-3 times on the seedling-grown plants raised by sowing. The liquid should be sprayed onto the back of the seedling leaves.

Powdery mildew

Powdery mildew is a fungal disease with multiple infections. It mainly harms leaves and tender shoots. Diseased leaves shrink and twist into a ball, and both sides of the leaves are covered with a white powdery layer. The disease generally begins in May-June. In the early stage, small round white powdery spots appear on the front or back of the leaves, then gradually expand, causing tender leaves to shrink, roll lengthwise, and new shoots to twist and wither. When the occurrence is severe, yellowish-white small spots form in the white powdery layer, then gradually become yellowish-brown or dark brown, causing the leaves to wither and fall early.

Control measures

1. In winter, prune out diseased buds, diseased branches and overly dense branches so that the crown is well ventilated and lets light through, and promptly remove diseased leaves and diseased shoots to reduce the source of infection.

2. Strengthen management, enhance tree vigor, apply more organic fertilizer and phosphorus and potassium fertilizer, and avoid applying too much nitrogen fertilizer.

3. Spray control:

(1) After winter pruning, generally spray 1 time with 5 degrees Beaume lime sulfur mixture.

(2) After the disease occurs, you can spray 70% thiophanate-methyl wettable powder at 800-1,000 times dilution, or 15% triadimefon wettable powder at 800 times dilution, once every 7-10 d, for 2-3 consecutive sprays.

(3) When there is a lot of rain, the number of sprays should be appropriately increased, and spraying should be carried out promptly after each rain to prevent the disease from spreading.

Tortoise wax scale

Trunk-boring pests and the holes they cause in the tree body

Control measures

1. Manual physical control: trap and kill adults, manually remove egg masses, dig out pupae, etc.

2. Biological control: use insects to control insects, use fungi to control insects.

3. Chemical control: Green Weilei capsule.

Fall webworm

Leaf-eating pests and the leaf yellowing they cause

Control measures

1. Manual physical control: manual removal, surrounding with grass to trap pupae, light trapping, and trap killing.

2. Biological control: use fungi to control insects, use toxins to control insects, use insects to control insects.

3. Chemical control: bionic preparation control, botanical insecticides, and other chemical control.

Conclusion: A lovely tree must be well cared for. I look forward to growing a grove of sycamores.

NowPlantsWordour Taobao enterprise store has already opened. We create a dedicated lazy-person plant-growing life for you.

Search "Huayan Caoyu Enterprise Store" on Taobao and you can directly enter the store to buy.