The "tumor" on the chestnut tree is simply a swollen tumor on the chestnut branches, petioles and veins. The reason is that there are nodules, mainly due to the damage of the chestnut bee. The tumor is green at the beginning, and then slowly turns red, affecting the growth of the chestnut plants and the fruit results. In severe cases, the chestnut plants will die. Today, Xiaobian talks about the prevention and treatment of chestnut tree "tumor".
First, the growth law of chestnut bee
The chestnut bee is a generation in a year. In the winter, the larvae will overwinter in the buds, and the chestnut trees will be harmed again in April of the second year. In June, the larvae of the chestnut bee will be morphed into the tumor in the petioles and veins of the chestnut branches, and will be feathered in early July. After about 15 days of emergence, the insect will bite a hole and drill from the sputum. Produced in full buds. Once a chestnut bee, a female can produce 12-25 capsules. After hatching, the chestnut bee will continue to harm the chestnut tree.
Second, prevention measures
1, winter pest control
Combined with chestnut tree pruning, cut the twigs that have been endangered by the chestnut bee in the middle and lower parts of the chestnut canopy. For tall chestnut trees, you can use a trowel at the end of the bamboo raft. In this way, the locusts are cut and burned to eliminate the wintering larvae and reduce the source of harm.
2, protect natural enemies
The natural enemies of the chestnut bee are parasitic wasps, which are the peak period of parasitic wasps in April-May each year. During this time, do not spray on the chestnut trees to protect the parasitic wasps.
3, pharmacy spray
In June, spray with 90% trichlorfon 600-800 times, or use 80% dichlorvos 600-800 times, the insecticidal effect can reach more than 97%.
4, put the aerosol
In July, during the prosperous period of the chestnut bee, the aerosol was released in the chestnut garden, which has a very strong killing effect.
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