It is understood that the pests and diseases of late rice this year will be more serious. Therefore, before this, we must first understand the pest control measures of late rice, so that we can plan ahead and prevent it, so as to avoid the erosion of pests and diseases on late rice and improve the yield and quality of rice. The following are some of the prevention and control measures for the late rice pests and diseases that Huilin.com has compiled for everyone. I hope it will be useful to everyone.
First, late rice aphids
In the late rice field, the third generation of sorghum is generally sprayed and controlled in the early stage of egg hatching in early August. During the peak of egg hatching to the peak of the first instar larvae, spray 10% of chlorantraniliprole suspending agent per acre 5-10 ml; or 40% of chlorantranil. thiamethoxam water dispersing granules 8-10 g; or 40% Wei. chlorpyrifos water emulsion 20-30 ml; or 25% insecticidal double agent 250 ml; or 20% triazophos EC 120 ml; or 1.8% avermectin EC 20 ml, etc., 45-50 kg of water evenly Spray on the middle and lower part of the rice plant and keep the shallow layer of the field for 3-5 days when applying.
The third generation of sputum and sputum is mainly concentrated hazard. It can be used in the late stage of egg hatching in late August. It can be sprayed with special killing cockroaches, killing cockroaches, etc. It can also be used to kill star, triazophos, avermectin, etc. 50 kg of water, poured, and maintained the field water for 5-7 days after administration. The control time of the 3rd generation aphids is generally in the heading stage of late rice. To prevent the residues of pesticides in the rice, it is forbidden to apply high-toxic pesticides that are not allowed to be used.
Second, the late rice paddy
Late rice, rice planthoppers, generally gather at the base of late rice, and the insects are small and difficult to be noticed. It is often easy to miss the best period of prevention and control. Generally, it should be used in the late stage of the nymphs of rice planthoppers, and the effect is best. Therefore, the information of the agricultural technology department should be kept in mind at the beginning of the nymphs (early August, late August, early September, early September). From late to early October, the prevention and control indicators in the tillering stage to the jointing stage are 800-1000 heads of rice planthoppers per scorpion, 1500-2000 heads per ear, and 25 grams of 25% buprofezin WP per acre. Or 2 g of 25% thiamethoxam water-dispersible granules, or 25% of 25% pymetrozine wettable powder, or 1 time with 48% of 48% chlorpyrifos EC. The live rice field and the late rice field in the peak season should be separated before spraying, then the nozzle is sprayed through the trench to the base of the late rice, and the water layer is kept 3-5 cm after spraying.
Pyridoxine and the like have high activity against rice planthopper, and are a kind of pesticide with systemic conductivity and long duration. When the amount of insects in the late rice field is too large, it is necessary to add quick-acting agents such as isopropyl and chlorpyrifos. It is required to increase the water consumption when applying the medicine. It can also be applied to the method of controlling the sheath blight. In the morning and evening, the mist is applied, and the dew is used for secondary dilution and distribution. In the case of the occurrence of rice planthoppers, the use of triazophos and its compounding pesticides should be prohibited in the late rice fields, so as to avoid the induction of rice planthoppers to increase the number of eggs laid, resulting in the damage of rice planthoppers.
From late late August to early September, the brown planthopper is in danger. At this time, the mid-season rice has matured, and farmers tend to neglect pest control. However, the peak period of brown planthopper damage is the filling stage of rice, which often causes “matureâ€. Rice “wears the top†and “falls the stalkâ€. Therefore, in the mature stage of mid-season rice, do not ignore the prevention and control of brown planthopper. In the middle and late September, the brown planthopper migrated from the north to the south. When it meets suitable climatic conditions, it will land in the double-season late rice fields in the southern rice area. It is very easy to fall into the disaster in the big years, even if it does not cause landing. Disasters, as long as the autumn is not cool, after the relocation of the rice planthoppers to lay eggs, often in early October in the double-season late rice damage, resulting in a large area of ​​"wearing the top", "falling stalks."
Third, late rice disease
One is rice blast. Rice blast has the greatest impact on late rice yield, and may even cause granules to fail in the years when rice blast disease occurred. Prevention and control of ear mites should be based on prevention. Generally, it is sprayed at 10% of the break of late rice (one rupture per pupa); the second time is applied to see the changes in weather conditions and the development of the disease at the heading stage. Generally 20% tricyclic azole wettable powder per acre 75-100 grams or 75% sputum. Tebuconazole water dispersion granules (take enemy stability) 15 grams, or 40% Fuji No. 1 emulsifiable concentrate 100 grams, or 30% 150 ml of rice bran emulsifiable concentrate, or 100-120 g of 2% spring oleicin WP, or 44-55 g of 25% prochloraz emulsifiable concentrate, spray 60-75 kg of water.
The second is sheath blight. In the late rice, there is more rain in the late stage, and when the field is humid, the concealed and breathable in the field is poor, which is conducive to the occurrence and prevalence of sheath blight. It is necessary to strengthen the management of fertilizer and water in the field, increase the application of phosphorus and potassium fertilizer, and improve disease resistance. For the field where the disease rate reaches 20%, it is necessary to use 300g of styrene-propionazole per liter or 75% of sputum. Tebuconazole water-dispersible granules to spray the middle and lower parts of the concentrated rice plant. The severe disease Tiantian block is sprayed 2-3 times at intervals of about 5 days, and the rain should be replenished in time after 4 hours of treatment.
The third is rice smut. The microclimate in the field after the disaster is also very conducive to the occurrence of the disease, especially in the growing areas of susceptible varieties, which should be taken seriously. Rice smut is important in prevention and can be prevented by applying 5% of the break in late rice. The control agent can be sprayed with sufficient water by 30% benz. propiconazole or 24% Jinggangmycin A. Spray again after 5-7 days.
The prevention and control experience in many places proves that when controlling rice planthoppers and sheath blight in late rice, shallow water layers should be established in the field, which is more conducive to chemical pesticides that fall into the water, and is absorbed by the rice plants to exert their effects. The water layer is established in the field, and the rice planthopper that has been knocked down by the drug spray falls into the rice field, which is more likely to die and improve the control effect. The water layer should not be too deep. Generally, the field water should be kept at 3-5 cm, so that it can be naturally dried within 3-5 days after spraying. If the field water retention time is too long, the field humidity in the late growth stage will be too large, which will easily lead to grain. The occurrence of blight. In the field where the sheath blight is serious, it is necessary to pay attention to the dry management of the paddy field in the later stage, which is conducive to reducing the humidity in the field. It is also conducive to the management of dry and wet in the late rice, promoting the fullness of the grain and increasing the 1000-grain weight.
During the filling period of late rice, it is often affected by extreme high temperature, abnormal low temperature and heavy storm and rain. If the maximum temperature exceeds 35 °C for more than 3 consecutive days during the filling period, high temperature heat damage will be formed, resulting in poor pollination and emptying rate of late rice. It is necessary to timely adopt the daily irrigation method or foliar spray fertilizer to adjust the field microclimate. Improve the physiological function of rice plants and reduce the effects of heat damage. If the temperature is below 20 °C during the flowering stage or the filling stage, the heading speed will slow down, and the phenomenon of “necking†will be severe, which will delay the flowering period, even fail to flower or close the pollination, and the seed setting rate will drop greatly. The sudden high temperature after low temperature will also lead to a large area of ​​dead and dead seedlings, causing greater losses to late rice. Therefore, timely application of deep water, spraying foliar fertilizer and heat preservation agent should be taken in time to reduce the low temperature hazard and prevent the emergence of dead and dead seedlings in a large area.
Laryngeal Mask,laryngeal mask airway,pvc laryngeal mask,disposable silicone laryngeal mask
Anesthesia Medical Co., Ltd. , https://www.jssinoanesthesia.com