Occurrence and Control Techniques of Orchard Pests in Autumn

2022 09/02

At present, most fruit trees such as peaches, pears, and grapes in our province have entered the end of the harvesting period. Due to the favorable climate conditions this summer and the lax control of diseases and insect pests before and after the harvesting period, the number of adult pests such as the small pear borer has increased sharply recently. The rise will have a negative impact on the output in the later period and the growth in the next year. All localities should do a good job in the monitoring, prevention and control of major diseases and insect pests in autumn, so as to lay a good foundation for effectively controlling the hazards of the current year, reducing the occurrence base of the next year, and ensuring high-quality and high-yield fruit trees in the following year.

According to the monitoring of fruit tree disease and pest monitoring points in the whole province, since mid-August, the trapping amount of adult pear borer worms in Taoyuan and Liyuan has remained high, and most of them were significantly higher than the same period last year. Among them, the monitoring insect population in Taoyuan is relatively unbalanced. From August 18 to September 1, the cumulative number of insects trapped in the Wujin monitoring point was 54.6 insects/board, and the cumulative insect count in the Zhangjiagang monitoring point was 307 heads/board. The cumulative number of insects at the point was 560.7 heads/board, and the cumulative number of insects at the Ganyu monitoring point was 738 heads/board, most of which were at a relatively high level of insects; the amount of adults trapped in pear orchards was significantly higher than the previous period. The accumulative number of insects in Feng monitoring point was 185.9 head/board, Tongshan monitoring point was 477 head/board, Suining monitoring point was 135.5 head/board, and Wujin monitoring point was 626.7 head/board, higher than the same period of last year.

Prevention technology

1. Chemical control biofungicide & Biopesticide

Vineyards should pay attention to the damage of spider mites, leafhoppers and noctuid pests in the later stage. Pear orchards should pay attention to the damage of pests such as small pear borer and pear net bugs in the later period. Orchards in the harvesting period or early harvesting period can be selected if the pests are heavy Emergency prevention and control of biological agents with broad insecticidal spectrum and high safety, such as 1,000-1,500 times solution of 60 g/L spinosad suspension concentrate, or 500-1,000 times solution of 8 billion spores/ml Metarhizium anisopliae, Or 0.3% matrine water 600-750 times solution, etc., spray in the evening when the weather is fine, pay attention to the use of agents in rotation.

For orchards that have already harvested, you can choose 25 g/L deltamethrin EC 2,500-5,000 times, or 25 g/L efficient-cyhalothrin EC 3,000-4,000 times, or 3% avermectin Emulsion 3,000-5,000 times liquid and other chemicals, control 1-2 times to reduce the number of insects.

2. Non-chemical control

(1) Clean up insects, stiff fruits, dead branches and fallen leaves and waste bagging in time, and take them out of the garden for centralized treatment;

(2) Grab the favorable opportunity of aphids moving back to the orchard in September, and hang yellow boards around the orchard, hanging about 20 yuan per mu, to trap and kill the returning pests;

(3) In orchards with heavy occurrence of spider mites, predatory mites can be released for prevention and control after 5-7 days of chemical control;

(4) From September to October, grass handles, sacks, corrugated paper, etc. can be tied near the base of the main trunk of the plant, which can attract various pests such as pear borer, leaf roller moth, scale insect, red spider, etc. to reduce the number of insects.

If you have any needs for plant growth regulators, biostimulants, biopesticide, etc., please feel free to contact us.

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