It is expected that the two diseases and one insect in the rice earing stage will be biased in 2018.

Rice panicle stage is an important period for a variety of pests and diseases, and it is also the most critical period for prevention of diseases and insects. Comprehensive analysis of field pests and diseases, meteorological conditions and other factors related to the occurrence of pests and diseases at the ear, is expected to be biased.

Trend analysis

It is expected that the "two diseases and one insect" mainly based on rice blast, rice false smut and rice leaf roller are generally biased, especially the risk of panicle rice blast and rice blast disease.

The main basis is 3 points

(1) There are many rainy weather in the heading stage. According to the forecast of the meteorological department, there will be multiple shower weather processes in Jiangsu Province from late August to early September. After August 20, the temperature will drop. There is no regional high temperature above 35 °C in Jiangsu Province. Typhoon No. 19 “Su Li” will also affect Jiangsu. The province brings down the temperature of precipitation and precipitation, and it is also conducive to the epidemic of rice blast and rice smut. It is conducive to the relocation and retention of "two-shift" pests such as rice leaf roller. Worried.

(2) The number of pests and diseases is high in some areas. Rice blast, pre-emergence rice blast and leaf blast are common in hilly, riverside, coastal and Huaibei areas, and some diseased cultivars (such as Nanxun 9108, Huajing 7 and Yangnongdao 1) have a disease rate of 40. More than %, plus the total amount of straw returned to the field in a row, the field of rice blast and rice smut disease is sufficient.

In the rice leaf roller, around August 18, adult peaks appeared in the fields of Jiangsu Province. Among them, the amount of moths in the Taihu Lake and the Yanjiang area was 1,500-3,000, and the number of eggs in the area was 100-500 heads. Occurrence indicator

As the adult lays eggs and the eggs hatch, the amount of eggs in the field will continue to increase. In addition, sheath blight has been affected by the high-temperature and high-humidity microclimate environment since late July, and the disease has risen rapidly. In recent days, the rate of disease in the lower reaches of the river, hills and Huaibei is generally 5% to 30%, and the disease rate is 2% to 10%. The rate of recurrence of diseased fields is 30% to 70%, and the rate of diseased plants is 10% to 50%. In the parts of the Yangtze River, the Great Dam, and along the river, hills and parts of Huaibei, the amount of residual insects was high.

(3) The main rice varieties are weakly resistant. Judging from the occurrence in recent years, the main varieties in Jiangsu Province are not resistant to rice blast, especially the rice blast and rice smut varieties with good taste of rice this year are expanding. In addition, the comprehensive breeding model of rice fields in recent years has been rapidly promoted, pests and diseases. The complexity and uncertainty of occurrence increase, and the rice growth process varies greatly, which not only increases the probability of encountering rainy weather during the heading stage, but also facilitates the pests and diseases.

Prevention opinion

(1) It is necessary to do a good job in monitoring and investigation to improve the accuracy of measurement and reporting. This year, pests and diseases have complex and unbalanced characteristics, and it is necessary to closely follow the requirements of “wide coverage, sufficient quantity and high quality”, expand the scope and frequency of investigations, improve the representativeness and accuracy of investigations, and grasp in a timely manner. Rice diseases and insect pests and their reproductive processes in different regions, different varieties and different cultivation methods.

It is necessary to strengthen the contact with experts in cultivation, meteorology, etc., and give full play to the role of the rice innovation team and the expert collaboration group to release the trends of pests and diseases in the quasi-fertility and panicles to the society and the grassroots in a timely manner.

(2) Adhere to scientific prevention and control, and improve the accuracy of medication. Grab the main prevention and control objects. It is important to focus on the main pests such as rice blast, rice false smut, and rice leaf roller, and take into account the sheath blight, aphids, and rice planthoppers. Grasp the control period. Focus on the early stage of the break and the use of medicine at the heading stage. In the area where rice is about to break in the near future, it is necessary to organize an overall battle against rice blast, sheath blight, and rice leaf roller, based on the disease and insects.

In the area from the end of this month to the beginning of September, the region has recently been combined with the control of rice false smut, and the overall warfare of rice smut, rice leaf roller and aphid has been organized. In the early stage of the break, the rice blast is attacked. , rice leaf roller. At the heading stage of rice (5-7 days after the break), according to the weather, resistance of rice varieties and the occurrence of pests and diseases, mainly the rice blast, taking into account the pests such as sheath blight and rice leaf roller, Prevention and treatment.

Bacterial disease recurrence areas such as bacterial blight, such as in the above-mentioned overall battle can not take into account, it is necessary to carry out separate prevention and treatment. Use green safety pharmacy. The products of the Jiangsu Provincial Green Prevention and Control Products Joint Promotion List will be selected in 2018, and the biological agents and high-efficiency, low-toxicity and low-residue counterparts will be applied.

For the panicle neck, a single agent such as tricyclazole, rice amide, rice blast, pyraclostrobin microcapsule suspension, azoxystrobin and the like can be used, and a compounding agent can be used for the sheath blight. a single agent such as furamide, tebuconazole, trifloxystrobin, jinggangmycin A, oligosaccharide, and a compounding agent thereof;

For rice false smut, a single agent such as epoxiconazole, trifloxystrobin, tebuconazole, jinggangmycin A, Bacillus cereus, Bacillus subtilis, and a compounding agent thereof may be selected; for rice leaf roller and aphid, A single agent such as chlorantraniliprole, tetrachlorfenamide, methoxyfenozide, avermectin, indoxacarb, ethyl spinosyn, and Bacillus thuringiensis may be used, and a compounding agent thereof;

For the brown planthopper, a single agent and a compounding agent such as trifluoropyrimidine, nitenpyram, pymetrozine or dinotefuran may be used. For a variety of pests and diseases mixed field, you can choose the right pharmacy, scientific compounding, one application, both pest and disease.

Pay attention to safe medication, use triazole pesticides with caution to prevent phytotoxicity. Comprehensive breeding of rice fields, agricultural mulberry mixed areas and aquaculture areas should coordinate the contradiction between farmland medicine and sericulture and aquatic products, and pay attention to the protection of silkworms and fishery safety. The last time the rice is used, the pesticide safety interval should be strictly enforced to prevent pesticide residues from exceeding the standard.

(3) Strengthen service guidance. The rice earing stage is the most critical period for the prevention and control of pests in the whole season. It is necessary to use the drug type, the correct period, scientific prevention and control, and ensure the safety of rice and aquatic products. The demonstration and control zone for green pests and diseases of rice pests and diseases in Jiangsu Province should play a leading role in guiding and guiding the masses in scientific use of drugs, green prevention and control, and drug control. Improve the service level of professional service organizations, promote the integration of unified defense and green prevention and control, and improve the effectiveness and efficiency of pest control in rice panicles. (Jiangsu Plant Protection Station)

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