How to prevent strawberry red spider

Red spider control measures:

To achieve early detection and early processing. In day-to-day management, attention should be paid to early observation and early detection. Red spiders are often densely populated with the old leaves of the lower part of the plant. They can be combined with daily agricultural operations and management. When sporadic occurrences occur, the old leaves, the leaves and the leaves of the pests are promptly removed, and the source of insects is reduced. Avoid further damage in the future.

1. Isolation measures: Strictly control personnel access to the booth to reduce the transmission probability of the string. Dismantling pad or sprinkle white ash to block the artificial spread in the front of the shed, and special tools for the shed to avoid cross-propagation.

2. Cultivation measures: During strawberry seedlings, pay attention to timely watering and avoid drought. During the cultivation period, the management of water and fertilizer should be strengthened so that balanced fertilization can be achieved and robust plants can be cultivated. Red spiders mostly have large inhabited densities on the lower leaves of plants, so removing diseased leaves and yellow leaves at any time can effectively reduce the spread of insects. Increase ventilation and light transmission in the shed and reduce the occurrence of red spiders.

3. The release of natural enemies: In the early stages of the occurrence of red spiders, the use of predatory mites control the occurrence, development and spread of spider mites. Prior to the release of predatory mites, the cardinal number of spider mites was kept as low as possible, and pest control was carried out with 99% mineral oil 200-fold plus 1% matrine azadirachtin or 1.8% avermectin. After 5-10 days, the population density was in accordance with the benefits. When the pest ratio was 1 to 30 or ≤ 2 head/leaf, the predatory mites were released and both of them could control the damage of red spiders better, and they could also control pests such as whiteflies and thrips.

4. Biopesticides: 99% of mineral oil was diluted 200 times with water and 1.8% of avermectin was sprayed 2000 times, 7 days for one time, and 2 times for continuous control.

5. Chemical control: Use 99% mineral oil 200 times plus 8% Avignon EC 1500 times, or add 5% thiazolynatone EC 1500 times, or add 43% diphenoate suspension 2000 times; 7 days Prevention once, continuous prevention and treatment 2-3 times, a variety of agents alternately use better.

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