Summer Vegetable Seedling Attention Pest Control
Summer vegetables include Cauliflower, cabbage, cabbage, celery, lettuce, lettuce, and solanaceous vegetables grown in autumn. During the high temperature period in summer, due to high temperature, strong light, heavy rain, high pests and other unfavorable factors, it is extremely difficult to cultivate strong seedlings, and the live growth of vegetables is poor, affecting autumn vegetables and autumn vegetables. Therefore, it is hoped that field investigations will be strengthened, technical guidance will be provided, and the prevention and control of plant diseases and insect pests in summer will be well addressed.
First, the main pests and diseases
Overbearing disease: The early stage of seedling growth is prone to damping-off. In case of heavy rain, high humidity invades the seedbed, which is conducive to the occurrence of the disease. Vaccination after seedling vulnerability, seedlings high temperature, leggy seedlings can easily lead to damping-off, especially the seedbed seeded dense, missed seedlings, etc., more conducive to the spread of the disease.
Virus disease: In the summer and autumn, the nursery is in the high temperature season. The light intensity is strong and the ground water evaporates quickly, causing virus disease easily. In addition, rainstorms can easily lead to flooding and other phenomena. Roots develop rooting due to high temperature and oxygen deprivation. Under appropriate external conditions, the virus invades.
Underground pests: The underground pests that damage the seedbed mainly include ground tigers, badgers, and crickets. They mostly occur after emergence and fall to the seedling stage. Because the underground pests have a stable living environment, strong concealment, and difficulty in control, they often cause damage to the roots. Dead seedlings, as well as a large number of seedlings.
Yellow striped hops and whiteflies: Yellow striped bucks mainly harm cruciferous vegetables, often causing devastating damage to the seedlings and suitable for growth and reproduction in summer. Bemisia tabaci has a wide host range, which can cause damage to facilities and open field cultivation of a variety of seedling vegetables, sucking plant sap, causing weak and dry seedlings, and is also the main mediator of viral disease transmission.
In addition, leafminers and other pests also have certain damages to the summer seedling vegetables, and they should guide the farmers in a timely manner to prevent and control summer seedling pests and diseases.
Second, prevention advice
In summer, when seedlings are nursed, the temperature and humidity of the seedbeds are relatively high, and attention should be paid to the changes in temperature and humidity, covering the shade nets in time, removing the skirt film to enhance ventilation, and avoid excessive watering to cause leggy. The prevention and control of pests and diseases should be highly efficient, low-toxic, safe, and the timely prevention and treatment of counterpart drugs, and pay attention to the rotation and rational use of pesticides. High temperature season is strictly prohibited medication at noon, prone to phytotoxicity.
Leaf miners: The agent can be sprayed with 50% ciprofloxamine soluble powder 2500 times, 1.8% abamectin EC 2500 times.
Virus Disease: Combining the Prevention and Control of Hygroptera Pest Prevention In the early stage of onset of spraying virus control agents, use of 20% morpholinium-ethyl copper WP and 0.04% of liposolactone combined, can greatly improve the prevention of viral disease. At the same time, we must strengthen fertilizer and water management and cultivate strong seedlings to improve plant resistance to stress and disease resistance.
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