What should be noted for pest and disease control in the late stage of rice?
What should be noted for pest and disease control in the late stage of rice? Please advise. The following points should be noted for pest and disease control in the late stage of rice: The control target must be clear. According to the different types of pests and diseases in the field, corresponding pesticide control should be adopted. When pesticides are mixed, their content must be clearly understood, especially for the control of panicle neck blast. Tricyclazole has...
What should be noted for pest and disease control in the late stage of rice? Please advise.The following points should be noted for pest and disease control in the late stage of rice:
The control target must be clear. According to the different types of pests and diseases in the field, corresponding pesticide control should be adopted. When pesticides are mixed, their content must be clearly understood, especially for the control of panicle neck blast. Tricyclazole has 2 formulations, and they must not be mistaken.
Do not arbitrarily increase the amount of pesticide used. Blindly increasing the dosage of chemicals increases the cost of pest and disease control and easily causes phytotoxicity to crops. In addition, pesticides must be mixed and used immediately to prevent chemical reactions between pesticides that reduce efficacy. In summer and autumn there are many thunderstorms. Adding adjuvants to pesticides can both enhance the effect of the spray solution and delay washing off by rain, better ensuring control efficacy.
Spraying must be uniform and consistent. When using a pouring pump for pest and disease control, pesticide must be mixed in sections and buckets according to the length of the field, or the spraying scale must be marked on the mixing container. At the same time, the nozzle that draws pesticide and water must be protected from blockage by debris. When using a 1.6-horsepower mist sprayer, staffing must be sufficient, generally spraying in a north-south direction with 6-7 people, and each bucket of water should cover 1-1.3 mu. When starting to spray, the nozzle opening can be closed slightly and the settled spray liquid first sprayed into the air or placed into the bucket in advance. When each bucket of water has been sprayed to the end, the nozzle opening should be shut off immediately. Repeated spraying is not advisable, to prevent high-concentration spray liquid from burning the seedlings.
There are particular requirements for application time. Try to avoid the rice flowering period (apply before 9 a.m. and after 3 p.m.) to avoid causing pollen sterility; applying pesticide when morning dew is too heavy is also not advisable, as it reduces the content of the spray liquid; if the pesticide contains phoxim or other pesticides that decompose easily in light, it should be applied on cloudy days or after 3 p.m.; if dichlorvos is used in the late growth stage of rice to clean up remaining rice planthoppers, it should be applied at noon in clear, good weather to improve control efficacy.
The spraying site must be clear. When controlling panicle neck blast and rice leaf roller, the nozzle should spray upward, letting the fine spray liquid slowly fall or drift onto the panicles or leaves of the plants. For control of these pests and diseases, a 1.6-horsepower mist sprayer has better efficacy; when controlling rice planthoppers or rice sheath blight, the nozzle should be aimed at the middle and lower part of the plants, letting as much spray liquid as possible spray toward the base of the rice, strengthening pest and disease control and protection of the leaves. For control of these pests and diseases, a pouring pump with a large water volume is better.
There is knowledge in field water layers. When controlling rice planthoppers and rice leaf roller larvae of the 2nd instar or older, a water layer should be properly established in the field for 3-5 days, so that the spray liquid covers the field surface and forms a spray liquid layer that climbs between plants, increasing control efficacy; if controlling sheath blight, rice blast, rice false smut, or eggs and young rice leaf roller nymphs, then the water layer is not important; but when carrying out field fumigation in the later stage to control rice planthoppers, the field must be kept dry with no water in order to achieve better control efficacy.
Pesticide use must be appropriate. It is strictly forbidden to use methamidophos, 1605, and other pesticides explicitly banned by the state, as well as pyrethroid pesticides. For fields with rice quality traceability, the designated formula should be strictly applied, and it is forbidden to use pesticides with long residual periods such as buprofezin, pymetrozine, and profenofos. No pesticide should be applied one month before harvest.
Pay attention to checking pest and disease control efficacy. Contracted workers and farmland management personnel should, within a certain period after pest and disease control, strengthen checks on pesticide control efficacy. For fields or sections with poor control efficacy, the causes should be identified promptly and supplementary control carried out immediately, so as to eliminate the occurrence of pests and diseases in the bud.
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