To fight against the "three insects and three diseases" prevention and control of rice
To fight against the "three insects and three diseases" prevention and control of rice
The current rice “three insects and three diseases†refers to two generations of second instars, three generations of rice planthoppers, three generations of rice leaffolders, sheath blight, rice blast, and rice smut. According to field monitoring and climatic conditions, “ "Three insects and three diseases" is already a large-scale ecological situation. The vast number of farmers should attach great importance to seize the opportunity to fight the tough battle to ensure the safety of rice production.
First, the degree of occurrence
The second generation of Sichuania (5); 3rd generation of rice planthoppers (5 grades), partial outbreaks of disasters; 3 generations of rice leaffolders moderate to large (4-5) Large occurrence of sheath blight (level 5); moderate to heavy occurrence of rice blast disease (level 4-5), hilly mountainous areas are more important than plains, and susceptible varieties will be endemic; rice smut disease occurs moderately to moderately ( Level 3-4).
Second, the main basis
The analysis of the developmental progress of the 1st and 2nd generation S. japonicum showed that the second generation of S. indica rose moths peaked on July 14-26, and the egg hatching peaked on July 24 to August 4. The first generation of the second-generation insecticide was 1722.4 heads. Because of the high base number and the long moth period, it must be controlled in different time periods.
The 2nd and 3rd generation rice fly crickets had 774 total insect traps on July 1-17, which was 7.2 times of the same period of last year. The second was the census on July 17-18, with an average of 1205.2 tussocks per field in Daejeon. Above the head accounted for 50%. The highest field volume is 6770 heads. The field has a total of 49 eggs and an average of 45 adult worms. Due to the postponement of the rainy season and the large amount of insects that have migrated, the field has already become a large-scale ecological force. If it is not controlled, it will explode.
3rd and 3rd generations of rice leaffolders in field surveys from July 17th to 18th, with an average mu moth of 76 heads, and a maximum field mass of 340 mos of moths. The field is at the peak of the moth. Recently, frequent rains will increase the number of repellent insects and field hazards will increase.
4. Rhizoctonia systematic survey, the weighted average disease sickness rate was 24.8%, the diseased plant rate was 1.33%, the disease index was 0.61, field sheath blight was in the vertical expansion period, and the census was conducted on July 17-18, and some field blights occurred. Has been on the top, a serious hazard.
5, rice blast disease system survey, leaf rice blast weighted average disease leaf rate of 0.32%, hilly mountainous area is heavier than the plains and mountainous areas, part of disease-resistant variety disease has been popular. In late July and early August, the prevention and control of leaf rice blast should be strengthened to reduce the number of pathogenic bases and prevent the occurrence of rice blasts in the panicle neck.
6. Rice cultivars The city's planting varieties are dominated by high-quality rice. If rice falls continuously during rainy season, rice smut disease will occur seriously.
7, climate and varieties are extremely conducive to the occurrence of pests and diseases. Due to the postponement of the rainy season and the increase of rainwater, the summer is not hot, and a suitable temperature and high humidity environment is extremely conducive to the relocation of the “two migration†pests and the prevalence of diseases. At the same time, rice varieties are numerous, chaotic and miscellaneous, and most of them are not resistant to disease, which is beneficial to the occurrence of diseases and pests.
Third, prevention and control measures
1. Prevention and control strategies The prevention and control of rice “Three Insects and Three Diseases†should adhere to the principle of “governing early and managing small and early-stage prevention and comprehensive controlâ€, grasping the right timing, catching up with sunny spraying, and effectively combating the tough battle to ensure the safe heading of rice.
2. The towns (departments) villages that carry out unified prevention and control shall give full play to the role of plant protection and prevention cooperatives, concentrate on the development of unified prevention rules, and ensure the prevention and control of pests and diseases.
3. Prevention and treatment time and subject field The first prevention and treatment time: July 25-28, the second prevention and treatment time: August 4-8. Control object fields: all Zhongdao Datian. Reminder: The second prevention and treatment time is the critical period of the second generation of the second peak of the second generation, the third generation rice planthopper and the third generation of the rice leaf roller. Sub-control uses long-acting agents such as Kang Kuan et al. In the second time, it can reduce the control of stem borers and rice leaf roller.)
4, prevention and treatment agent recommended
1. Control 20% of loquat mu with 20% chlorantraniliprole (such as DuPont Kangkuan, Puzun, etc.) 2 bags or 40% kill monosodium (such as Ruiba, etc.) 30-50 grams or 40% of Avichlor (such as phlegm, etc.) 50-60 ml.
2. Control 20-30 grams of 25% thiazolyl 20-40 grams or 5% pymetrozine (such as peony ketone) 20-40 grams of rice planthoppers or 25-40 grams of 25% buprofezinone.
3, control 20% of chlorella benzamide (eg DuPont Kang Kuan, Pu Zun, etc.) 2% of rice leaf roller or 1.8% of abamectin (such as Yiding, Zhifei, etc.) 60g or 40% Acipheroxime (such as iron, etc.) 70-100 ml.
4. Control 20% of rice blast with 20% Bacillus subtilis 40ml or 75% of rice bran 75-100g, 50% of silicidazole carbendazim (such as Dupont, etc. .
5, control sheath blight, rice fungus disease mu 15% with 30-40 grams of Jinggang straw, or 30% benzoylzinc (such as Amy, etc.) 15-20 ml or 10% Jinggang midamide 40 grams.
The above control agents can be optionally composed of a composition formula, and each unit is sprayed with 50 kg of water per mu (30 kg of motorized sprayer). (Dangyang City Plant Protection Station Agriculture 110 Zhu Liqing)
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