On May 29, Yue Shoujun from Zhangwan Township, Donghai County, came to the telephone to report that the occurrence of SBPH in wheat fields was very serious and there were a few ticks. He asked whether chlorpyrifos and dichlorvos could be treated with imidacloprid or acetamiprid.
Rice stripe disease and black-streaked dwarf disease are viral diseases transmitted by Laodelphax striatellus. The prevention and control of Laodelphax striatellus can reduce the occurrence of these two kinds of rice virus diseases. Wheat is the main overwintering host of wintering planthoppers in the winter. The planthoppers reproduce in the wheat field in the spring. The harvesters of the previous and the following generations of the wheat migrated to the fields of paddy fields and corn fields. Depressing the amount of S. infestans in wheat fields can reduce the amount of insects that migrate into paddy fields, alleviate the pressure in field and field, and reduce the incidence of stripe blight and black-streaked dwarf diseases in rice fields.
According to Zhu Feng, plant protection station of the province, although the amount of fly hoppers this year is lower than last year, it is still higher than normal. In most areas, the number of ash in the wheat field is 50,000 to 150,000 heads, and in some high areas, the amount of worms reaches 200,000 to 1 million heads, and in some areas in the Yangtze and Huaihe Rivers, between 1.5 to 2 million heads per year. . The best period for controlling SBPH is the peak period of young nymphs. The peak of young nymphs of this generation of SBPHs appeared in the middle and early May. Now the generation of SBPH has developed into adults. Due to the fact that the majority of wheat field hoppers have reached the prevention and control index (200,000 to 300,000 worms per mu), the use of drugs to control adult worms can alleviate the pressure on rice fields. Some plots with low insect populations can wait for the control of rice planthoppers during the rice field.
In the prevention and control of wheat planthoppers in wheat fields, it is still necessary to combine good medicines with good effects and long-acting medicines, and pay attention to alternate medications. The medicines that are effective in controlling Laodelphax striatellus are chlorpyrifos, isopropoxylate, sec-butylcarb, imidazolam, methomyl, dichlorvos, etc. The medicines with long potency are nitenpyram, pymetrozine, and ethiprole. , Thiamethoxam, butyl sulfide carbofuran and so on. Due to the long-term application of imidacloprid, in recent years, Laodelphax striatellus has produced a certain level of resistance to imidacloprid, and the control effect has been reduced, and it can be used appropriately. In Shandong and other places, SBPH has a strong resistance to buprofezin, and this drug is used to prevent and control Laodelphax striatellus. Poorly controlled areas can be controlled by other drugs.
Acetamiprid had better control effect on Laodelphax striatellus, but its advantage was not obvious compared with other drugs such as isoprocarb. In the case of wheat fields and aphids in wheat fields, chlorpyrifos can be mixed with imidacloprid or acetamiprid. Dichlorvos have a good effect on the fumigation of Laodelphax striatellus, but its short duration of effect is applicable when a large number of adults of Laodelphax striatellus appear and can quickly kill Laodelphax. Note that when the temperature is low in the morning, apply pesticides, use the high temperature at noon to increase the insecticidal effect, and do not spray on sunny days at high temperatures to prevent poisoning.
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