I. Diseases One or two years old Red maple has few pests and diseases. Red maple with a stem diameter of more than 3 cm often infects fungi every year from May to June. Especially in the plain areas, the planting density is high, the plots are damp and the disease is even more serious. . Symptoms are anti-curls on the tip of the leaf, dark red spots on the leaves, perforation after sun exposure, only veins and petioles left in September and October, and even whole leaves withering, shoots dry, leaves only branches, winter and spring cold season Dead, and some died after long leaves in the spring.
In the cultivation, fertilization should be based on farmyard manure, heavy phosphorus, potassium light nitrogen fertilizer, red maple can not be topdressing to prevent exposure, burning twigs, in addition must improve ventilation and light, improve disease resistance. Can be used 65% zeson zinc, 50% carbendazim or 70% thiophanate 800 to 1000 times, mixed with 500 times potassium dihydrogen phosphate or trace element foliar fertilizer spray, sunny spray 3 to 4 times, January spray stone Sulfur mixture at one time.
Second, pests
1. Leafhopper In May, when the temperature is wet and rainy, the leafhoppers are eclosion, and the leaf juice is sucked to make the leaves appear white-white dots and the leaves are dull. 40% omethoate can be used, and fluoxetine powder 1000 times spray is added. The spray must be sprayed finely from the canopy.
2. Cocoon moths occur in August, nibbling on foliage, and plucking entire leaves. Can be used 90% trichlorfon 800 times spray.
3. The stem borer larvae have the most harm, and begin to ovulate in mid-to-late June until hatching in October. More than at night, the days of cattle ovulate at the base of the tree near the surface of the cracks in the bark. The larvae circumnavigate the curve and then descend into the xylem. Powdered excrement is pale yellow and discharges from the ground. The stem pests mostly penetrate into the pith directly from the middle of the trunk to the branches, and then loop outwards to the cortex. During the incubation period of June and July, use 40% omethoate 800 times trunk spray, or use omethoate 5-fold concentrated liquid to ring the tree base 10 cm wide to kill the eggs. It was found that the accumulation of insect feces can be used to remove the larvae. For pests that have entered the trunk, they can be injected with an 18% solution of insecticide 50 times until they overflow, killing the larva immediately.
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