Early prevention and early treatment of potato late blight to ensure stable production

In order to accelerate the promotion and application of green prevention and control technology products, and continue to promote the reduction of pesticides, the National Agricultural Technology Center has organized and formulated technical plans for the prevention and control of major potato diseases and insect pests. Potato late blight is expected to occur in 2021, and the area will reach more than 28 million mu; early blight, mole disease, underground pests, aphids and other diseases and insects occur moderately in general, and occur more severely in local areas; verticillium wilt, scab, potato Diseases and insect pests such as tuber moth tend to aggravate.

According to the characteristics of the occurrence of major diseases and insects in different potato planting areas, potato late blight has been identified as the national key target for prevention and control, including early blight, mole disease, fusarium wilt, black shank, scab, aphids, thrips, underground pests, and 20 Eight-star ladybirds, potato tuber moths, etc. are the focus of regional prevention and control, and the relevant production areas take into account the prevention and control of ring rot, verticillium wilt, bacterial wilt, mealy scab, bean curd and other diseases and insects based on actual occurrences.

Prevention and control strategy

Implement the plant protection policy of "prevention first, comprehensive prevention and control", vigorously promote green prevention and control, give priority to disease-resistant varieties, select high-quality virus-free seed potatoes, seed potato treatment and other technologies, and scientifically use drugs based on predictions, forecasts and monitoring results of the early warning system, and strengthen Specialized unified prevention and control and joint prevention and control of farmers.

Key points of zone prevention and control

Eastern and Southern China planting areas: including Shandong, Zhejiang, Jiangsu, Anhui, Fujian, Jiangxi, Guangdong and other provinces (regions), focusing on the prevention and control of late blight, early blight, mole disease, black shank, fusarium wilt, and underground pests (grubs) , Mole cricket, golden needle insect, cutworm), potato tuber moth, aphids and thrips, taking into account ring rot, scab, powdery scab and bacterial wilt.

Prevention and control technical measures

(1) Broadcasting prevention and control technology

1. Crop rotation prevention technology. Implement crop rotation for more than 3 years to prevent soil-borne diseases and underground pests. ****** Rotate stubble with oil wheat, oats, wheat, corn, soybeans, broad beans and other crops; finely prepare the ground, sowing at a local temperature above 10℃, and the seeding depth is 8-10 cm, to avoid low ground temperature and over-seeding Deep emergence slowly aggravates the occurrence of soil-borne diseases such as mole and fusarium wilt.

2. Choose high-quality pest-resistant varieties and high-quality virus-free seed potatoes. According to the characteristics of different regions, select varieties that are suitable for disease resistance, good commercial properties, high yield and storage and transportation in the region. Choose high-quality virus-free potato original seed or first-level seed for sowing.

3. Disinfection technology of seed potato cutter. Before planting, put the seed potatoes in the room and pile them for 5-6 days, dry the seeds, and constantly remove the diseased potatoes. In the process of cutting seed potatoes, soak the cutting knife with 75% *** essence or 3% lyso water or 0.5% potassium permanganate solution for 5-10 minutes for disinfection, and use multiple cutting knives for rotation. Cut the seed potatoes into pieces of 40-50 grams, with 2 to 3 bud eyes on each piece, and the size of the cut pieces should be uniform.

4. Seed potato treatment (medicament seed dressing) technology. After the seed potato is cut into pieces, choose any one of fludioxonil, fludioxanil, fludioxonil or metalaxyl-fludioxonil for seed potato coating, or thiophanate-methyl + kasugamycin, Medicinal seed dressing such as Metarhizium anisopliae, Beauveria bassiana, Bacillus thuringiensis and other biological agents. Prevent and control soil-borne, seed-borne diseases, late diseases and underground pests. After dressing the seeds, dry them and place them in small stacks of net bags to maintain good ventilation to promote wound healing. Seed in 1 to 2 days.

5. Disease prevention technology with pesticide application in ridge and furrow along with planting. For plots with serious soil-borne diseases, bacillus biological fertilizer and biological inoculants are applied throughout the field. If the field is dominated by fungal soil-borne diseases such as mole, fusarium wilt and verticillium wilt, azoxystrobin or thiafluzamide is applied in the furrow during sowing. If scabs occur in addition to the above-mentioned diseases, furrow application of the agent can be used. Increase Pythium oligandrum or Pentachloronitrobenzene + fluazinam.

(2) Seedling stage pest control technology

Seedling stage refers to the potato tuber's emergence from seedling to plant budding. During this period, the focus of prevention and control is late blight, underground pests, and thrips.

In areas with a high incidence of late blight, such as Yunnan, Guizhou, Sichuan and other areas with heavy rainfall, if the air temperature after emergence reaches 18 ℃ and there are continuous rainy weather, it is necessary to spray mancozeb, fluazinam or cyfasazole, etc. Protective agents are used for protection and prevention 1-2 times. If there is a central diseased plant, spray the systemic *** agent dimethomorph, eugenol, or fluobacterium propamocarb, etc., to eliminate the central diseased plant for 1-2 times.

Except for areas with high incidence of late blight, other areas do not need to spray anti-disease agents. For underground pests, sex pheromone traps and kills adults, and one individual trap is set per acre, and the height is about 20 cm higher than the top of the potato plant. Light traps can also be used. One insecticidal lamp is placed every 20-30 acres, and the lights are turned on at night to trap and kill natural enemies as far as possible.

The adults were sprinkled with phoxim on the ground before unearthed, or sprayed with deltamethrin and other agents after unearthed.

Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone

Veterinary Products

...

Ivermectin Injection,Veterinary Injection,Veterinary Products,Veterinary Tablet

NOUVASANT GROUP LTD. , https://www.nouvasant.com