In May, after the chestnut trees entered the fruiting period, the threat of diseases and insect pests increased correspondingly with the increase of temperature. They had a great impact on the growth and results of chestnuts. In severe cases, they even led to the death of branches or whole trees.
Cloudbill
Adults are black or dark brown and appear from May to June. They take leaves and twigs and begin mating and laying eggs about 30 to 40 days after eating. Adults lay their eggs on the trunk less than 2 meters above the ground. After the larvae hatch, they first form triangular scars under the bark, and discharge a large amount of dung from the inhalation holes, causing the bark to expand outward longitudinally. Larvae in the bark after a period of harm, into the xylem, reached the pith when the trunk along the upturned food, when the tree was completely hollow and died.
Control methods shake the tree to kill adult flight weak, easily crawled by the ground to crawl, the adults can use this habit to shake the tree to kill.
Artificially control the manual scraping of eggs and newly hatched larvae. From May to June, the adult spawning and larval hatching period should be checked frequently. It is found that there are egg laying traces on the tree trunk and the parts of the newly hatched larvae that are hazardous. The knife should be scraped off promptly with a knife, and coated with omethoate to eliminate the larvae. The initial stage of subcutaneous harm is an important prevention and treatment measure.
The wormhole application should be checked frequently after May. It is found that there are fresh insect worms in the larvae of the cloudbill in the tree trunk. The wormholes in the wormhole must be promptly removed and smashed with steel wire, or the cotton ball must be used to dip the enemy liquid and petrol plug. Into the wormhole for smoking, after application of the mud sealed with wormholes.
Trunk whitening In the beginning of May, trunks less than 2 meters were brushed with lime, sulfur, salt, and water to prevent adult oviposition.
Chestnut bee
The adult was a black wasp. The larvae in the sprouting stage of the chestnut started to move, and the damaged leaf buds gradually expanded to form a moth. The tumors are round or irregularly oval, and there are sometimes malformed lobule on the tumor, which has a serious effect on the opening, hair lobe, and larvae of the chestnut tree. The worm began to phlegm in early May, and a large number of adult ecloses emerged in mid-June. After emergence, the adult worms stayed in the quail for half a month to drill and laid eggs in full buds. Adult worms occur mostly in the daytime, and they are the most during the morning from 8 to 12 in the morning. Sunny and windless weather is beneficial to the adult tumor activity. Its flying force is not strong. Most of the time it crawls on the trees and feeds on the buds. Form a small room.
Prevention and control methods Before the end of May, insecticides were removed and adult pupae were trimmed. All the tumor-bearing branches and leaves were cut off and burned out of the park to prevent the breeding of offspring of the chestnut beetle. This measure is to be achieved. Thoroughly carried out in the chestnut area can eliminate the damage. The strength of the tree was pruned and the management of fertilizer and water was strengthened to enhance the tree vigor.
The period from the end of May to the end of June is the period of adult emergence, spraying the canopy, if the pruning measures have not been thoroughly implemented, and then take the remedies after spraying, the larvae are rampant (usually from mid-May to early July). Spray and kill the pine nut solution or dichlorvos solution. Spray the medicine on the tree crown two times in the sunny morning. The chestnut bee has parasitic natural enemies. Try not to take the leaves spraying method.
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