At present, corn enters the post-mature stage. At this time, removing weeds from the corn field is the simplest and most effective method to prevent the “slope†of the next wheat.
Wheat "slope" is a disease caused by virus transmitted by Laodelphax striatellus. In the first half of this year, wheat has undergone “slopes†of varying degrees, mainly in the fields and fields, scattered small fields, and flowering fields. Some spring sowing of corn and early summer sowing of corn have led to rough shrinkage. The reason for this is closely related to the fact that there is less rainfall this year. Dry weather makes the slugs and locusts multiply quickly and in large quantities, and has a high risk of viral infection. Compared with previous years, the "slope" phenomenon has risen and risen this year. How to prevent autumn wheat "slope"? Clearing weeds is one of the simple and effective measures.
The nymphs of 4-5 generations a year are completed. After jatropha sowing, the nymphs move from weeds into wheat fields. After winter, they begin to turn green with wheat. Overwintering adults lay their eggs in wheat leaves, completing the first generation and wheat grouting later. In wheat fields, they are transferred to corn or weeds for breeding damage. From late August to early September, adults of the planthoppers lay eggs on monocotyledonous weeds. They are mainly crabgrass, barnyard grass and goosegrass. The hatched nymphs are infested. Living on the grass, with wheat sowing seedlings transferred to wheat damage. Once infected with wheat, corn, or weeds that are diseased, SBPH can be poisoned once in a lifetime, and nymphs and adults can transmit the virus.
At present, corn enters the post-harvest stage and it is transferred to weeds for damage and reproduction. Laodelphax striatus prefers spawning on old grass stems, producing a few grains or a dozen grains on one stem, and a dozen or hundreds of eggs from a female adult. If the eradication and eradication of weeds during this period can eliminate eggs and reduce the number of insect pests, it will have a multiplier effect in controlling the number of planthoppers.
Clean the pasture, clean up the field weeds and burn or chemically treat them on the side of the road. Do not stack the dry grass on the side of the road. Because there are many eggs on the subtilis, it can be thoroughly sprayed with the herbicide paraquat. For roadside and ditch-side weeds, use 20% paraquat 150-200 ml, 15 kilograms of water to spray. Make sure the grass and old grasses are thoroughly penetrated so that weeds die completely. The plots of wheat and corn in the previous season were the focus of general defense.
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