Osmanthus leaf blight
Symptoms: Occur at leaf margins and tip. Beginning with light brown dots, it gradually expands to irregular large patches. If several lesions are connected, the whole leaf will dry 1/3-1/2. Lesions are gray-brown to reddish-brown, sometimes brittle, with dark edges and slightly raised, with many small black spots in later stages of the disease. The back of the lesion is lighter in color.
Infection route: The pathogens use mycelium or conidia to overwinter in diseased leaves and diseased leaves, and conidia spread by wind and rain. The optimum temperature for the development of the bacteria is about 27°C. Potted plants are hot and humid, poorly ventilated, or when plant growth is debilitating, they are very serious; diseases occur more often on the old leaves after the winter, and more plants occur on the lower leaves.
Control methods:
1, horticultural control strengthen cultivation and management. Potted osmanthus must avoid water accumulation, increase humus fertilizer and potash fertilizer, in order to improve the resistance to disease. Diseased plants should be removed in time, and diseased leaves should be removed in winter to feed the source of infection.
2. During the disease prevention and control period, it can be sprayed 1:2:100 times lime-type Bordeaux mixture in the initial stage, and then spray 50% Benzol WP 1000-1500 times, or 50% carbendazim 800-1000 times. Conduct prevention and treatment.
The main pests of Osmanthus fragrans
Giardia
Larvae in the branch cortex foraging, out of the oil spotted brown colloid, severe damage, the bark burst, the main branch or the whole plant withered, adults eat bitter leaves into a missing moment, a large number of severe defoliants. Where the management is poor, the debilitating tree suffers even more. In the hatching period of larvae (generally May), the bark is scraped off and coated with 80% of dichlorvos emulsion 20 times; in adulthood (about 6 months), 90% of trichlorfon 1000 times is used for tree crown spraying 2 to 3 times. .
Scale insects
The scale insects harming sweet-scented osmanthus include red wax medium, blowing cotton medium, and wolfberry film medium. The nymphs and adults use a spit to pierce the stem tissue and suck juice, causing the leaves to die and die. At the same time, honeydew is secreted and soot is induced, causing serious damage. Spray 20% chrysanthemum-killing oil or 2.5% deltamethrin EC 2500 times during the incubation period of nymphs; when the shell is formed, spray 40% speed cull EC 1500 times, because of strong permeability, good control effect .
Thorn moth
There are yellow thorn moth, green thorn moth, green thorn moth, flat moth and so on. Most of the larvae in the larvae winter, young larvae clustered leaves, the heaviest from July to September, adult phototaxis strong. From May to June, blacklights are used to seduce adults; insects attached to branches and trunks are removed by hand; chemical control should be carried out in young larvae in a timely manner; 10% cypermethrin 2000 times or 90% dipterex 1000 times can be used. Kill larvae.
Symptoms: Occur at leaf margins and tip. Beginning with light brown dots, it gradually expands to irregular large patches. If several lesions are connected, the whole leaf will dry 1/3-1/2. Lesions are gray-brown to reddish-brown, sometimes brittle, with dark edges and slightly raised, with many small black spots in later stages of the disease. The back of the lesion is lighter in color.
Infection route: The pathogens use mycelium or conidia to overwinter in diseased leaves and diseased leaves, and conidia spread by wind and rain. The optimum temperature for the development of the bacteria is about 27°C. Potted plants are hot and humid, poorly ventilated, or when plant growth is debilitating, they are very serious; diseases occur more often on the old leaves after the winter, and more plants occur on the lower leaves.
Control methods:
1, horticultural control strengthen cultivation and management. Potted osmanthus must avoid water accumulation, increase humus fertilizer and potash fertilizer, in order to improve the resistance to disease. Diseased plants should be removed in time, and diseased leaves should be removed in winter to feed the source of infection.
2. During the disease prevention and control period, it can be sprayed 1:2:100 times lime-type Bordeaux mixture in the initial stage, and then spray 50% Benzol WP 1000-1500 times, or 50% carbendazim 800-1000 times. Conduct prevention and treatment.
The main pests of Osmanthus fragrans
Giardia
Larvae in the branch cortex foraging, out of the oil spotted brown colloid, severe damage, the bark burst, the main branch or the whole plant withered, adults eat bitter leaves into a missing moment, a large number of severe defoliants. Where the management is poor, the debilitating tree suffers even more. In the hatching period of larvae (generally May), the bark is scraped off and coated with 80% of dichlorvos emulsion 20 times; in adulthood (about 6 months), 90% of trichlorfon 1000 times is used for tree crown spraying 2 to 3 times. .
Scale insects
The scale insects harming sweet-scented osmanthus include red wax medium, blowing cotton medium, and wolfberry film medium. The nymphs and adults use a spit to pierce the stem tissue and suck juice, causing the leaves to die and die. At the same time, honeydew is secreted and soot is induced, causing serious damage. Spray 20% chrysanthemum-killing oil or 2.5% deltamethrin EC 2500 times during the incubation period of nymphs; when the shell is formed, spray 40% speed cull EC 1500 times, because of strong permeability, good control effect .
Thorn moth
There are yellow thorn moth, green thorn moth, green thorn moth, flat moth and so on. Most of the larvae in the larvae winter, young larvae clustered leaves, the heaviest from July to September, adult phototaxis strong. From May to June, blacklights are used to seduce adults; insects attached to branches and trunks are removed by hand; chemical control should be carried out in young larvae in a timely manner; 10% cypermethrin 2000 times or 90% dipterex 1000 times can be used. Kill larvae.
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