Techniques and Methods for the Control of Diseases and Pests in Osmanthus Trees
Knowledge snippet: Information about the techniques and methods for the control of diseases and pests in Osmanthus trees, here is a detailed introduction.
Techniques and Methods for the Control of Diseases and Pests in Osmanthus Trees
For Osmanthus tree leaf spot and blight diseases, spray Bordeaux mixture, benlate, or pyrazophos. In winter, prune and burn the diseased leaves. Before the larvae of the刺蛾 (spiny caterpillar) descend to form cocoons, loosen the soil at the base to attract the larvae to concentrate and form cocoons, then destroy them all, or spray with a 500 to 800 times dilution of Bt emulsion. In summer, spray lime sulfur solution or monocrotophos emulsion to control scale insects.
Common Diseases in Osmanthus Tree Cultivation
1. Leaf Spot Disease: Mainly affects leaf growth, initially appearing as small brown spots, round or irregular, later the center of the spots turns grayish white with black-gray moldy growth. High temperature and humidity often trigger the disease, which is spread by wind and rain. The disease diminishes after the temperature drops in October.
2. Blight Disease: Affects leaf growth, often starting from the tips and edges of leaves, with light brown spots that expand into irregular shapes. In the later stage, small black spots appear on the lesions. The disease is more severe in high temperature and humidity, poor ventilation, and weak plant growth.
Main Pests in Osmanthus Tree Cultivation
The main pests in Osmanthus tree cultivation are the刺蛾 (spiny caterpillar) and scale insects. The刺蛾 is mainly found on the underside of leaves, eating the mesophyll and leaving the epidermis. Scale insects appear mainly from May to June and August to September, preferring the shady sides of main branches and枝杈 (branch forks) and leaves, and they secrete honeydew, which can cause sooty mold.
Control of Diseases and Pests in Osmanthus Trees
1. Leaf Spot Disease: In winter, prune and burn diseased leaves. In early May, spray Bordeaux mixture, and later you can spray benlate or pyrazophos or methytobuzin.
2. Blight Disease: In the early stage of the disease, spray with zineb or Bordeaux mixture, and later with carbendazim or benlate. Ensure good drainage during the rainy season and strengthen regular management.
3. Spiny Caterpillar: Before the larvae descend to form cocoons, loosen the soil at the base to attract the larvae to concentrate and form cocoons, then destroy them all, or spray with a 500 to 800 times dilution of Bt emulsion. Alternatively, spray with brom**isobutyrate emulsion or cypermethrin emulsion.
4. Scale Insects: If the number of scale insects is small, they can be removed with a soft brush for good results. In summer, spray lime sulfur solution or monocrotophos emulsion, which can be used alone or in combination. Spray once a week, for 2 to 3 consecutive times.
The above information on the techniques and methods for the control of diseases and pests in Osmanthus trees is hoped to be of help to you!