Occurrence and Control of Common Diseases and Pests of Sweet Osmanthus

1. Leaf spot. The main harm to the leaves, the first is a small brown spots, lesions were round or irregular shape, the late central gray to gray white, red-brown edges, black gray mold on the lesions. High temperature and high humidity are often the cause of morbidity. They are transmitted through wind and rain, and are infested. The condition deteriorates after October. Prevention: 1 Pruning removes diseased leaves and removing diseased leaves in winter and concentrated burning; in the beginning of 25th, spray 1:2:100-200 Bordeaux mixture, and then spray 50% Benzoate 1000-1500 times or Zinazine Ring 500 times. Or 70% thiophanate-methyl 1000 times.

2. Leaf spot disease. Leaf lesions start from the tips of the leaves and leaves. Small spots are light brown, and then expand into round or irregular shapes. Lesions can connect to each other by 1/3 to 1/2 of the leaves, grayish-brown, and the edges are green. There is a small black spot on the lesion. High temperature, high humidity, poor ventilation, poor plant growth, the incidence of heavier, usually from July to November, the incidence of wind and rain. Prevention: 1 At the beginning of the disease, 65% of Johnson Zinc 500 times or 1:2:200 Bordeaux mixture can be sprayed; 2 can be sprayed with 50% Carbendazim WP 800 to 1000 times or 50% Benazet. Powder 10 to 1500 times liquid.

3. Thorn moth. Green or yellow-green, white topline, the most likely to occur in the back of the leaves, feeding leaves, leaving the cortex. Before loosening the larvae, the soil around the tree trunks can be loosened to lure the larvae to concentrate and then to eliminate. Or use spores of more than 10 billion billion / ml Bt emulsion 500 to 800 times spray, in addition can also be 2.5% of deltamethrin EC or 20% geraniol EC 3000 times spray.

4. Scale insects. In the Yangtze River basin, it can occur from 2 to 3 generations, and the severe damage is from May to June and from August to September. The epilepsy lived on the main tip and branches, or branches and leaves, and the honey nymphs secreted honeydew, which led to flowering trees. Coal pollution occurs. High temperature and high humidity are favorable to occur. When a small amount occurs, it can be softly brushed with a soft brush to achieve good results. In the summer, it is most advantageous to spray with 0.3 to 0.5 Baume degree lime sulfur, or 50% of monocrotophos EC 1500 times, spray alone or in combination, spray once every 7 to 10 days, and spray 2 to 3 times.

5. Red spider. High temperature and drought conditions often occur. Control methods: When the weather is dry, attention should be paid to irrigation and combined with fertilization to promote plant robustness and enhance insect resistance. In the application of chemical pesticides, attention should be paid to frequent rotations, because they will develop resistance after applying certain highly toxic pesticides. 40% Chrysanthemum EC can be sprayed with 2000 to 3000 times or 40% Dimethoate 1500 times, with good control effect.

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