Spodoptera frugiperda is a new pest in the seedling stage of summer corn, and has become a frequent pest of summer corn in Huanghuaihai area. It is the stalks returned to the field year after year, no-tillage sowing, which gradually accumulates and causes the outbreak of pests, which seriously damages summer corn. The lighter ones cause the lack of seedlings and ridges, and severely lead to the destruction of the seeds. It is the key to prevention and control to prevent the occurrence of the insect.
Two-point Spodoptera exigua
First of all, the wheat is harvested with low wheat stubble, the height does not exceed 15 cm, and the wheat straw is finely crushed to below 5 cm and scattered. In this way, the wheat straw will naturally fall between the wheat stubble, and a large amount of gaps cannot be formed between the wheat straw and the wheat stubble, which reduces the space for adult insects to gather, and will obviously reduce the harm. The current wheat harvester has this function, especially the wheat has good maturity, and the harvest effect is better in dry and hot weather at noon, which is suitable for large-scale popularization and application.
Secondly, after the wheat is harvested, the wheat straw in the field can be removed in a conditional place, and it can be used for papermaking, etc., and the night worm can not be harmed without the wheat straw covering. Similarly, after the wheat is harvested, rotary tillage, especially stubble stubble, is used to crush and compact the surface wheat straw and stubble with the stubble stubble, and the adult insects cannot migrate into the spawning hazard. The prevention and control rate of this method can reach 100%. The key technology is wheat Crushed immediately after harvesting, otherwise the adult worms have laid eggs in it and can be harmed. Wheat stubble removal technology has always been a key technology to control Spodoptera frugiperda, suitable for large-scale promotion. For wheat straw stalks to be sprinkled, it is also possible to eliminate only the stubble where there is wheat straw, which can also greatly reduce the workload in the field.
Third, remove the wheat straw from the corn planting row. After the corn emerges, if there is no wheat straw surrounding the tree, you will not suffer from the damage caused by Spodoptera frugiperda. The corn row rotary tiller planter, corn row deep sowing planter, or the horizontal distance between the opener and the fertilizer applicator can be adjusted from the original 5 cm to 10 cm to increase the width of the corn planting row. Many areas that are still covered can be supplemented by manually pulling apart.
Field control focuses on timely detection of harm
If the ecological prevention and control are not done well, how to prevent and control the harm in the field in time? Spodoptera frugiperda likes to be shaded and moist. If the field is wet when the wheat is harvested, the adults will immediately gather and lay eggs. The wheat harvest or corn planting starts 10 days, and go to the field to observe whether there are two small larvae of Spodoptera litura under the wheat straw, and the third instar larvae are about 5-6 mm long. It is also important to see whether the heart leaves of the corn are wilted. If there is wilting, pull the wheat straw to see if there are holes in the base of the stem. The best way is to spread poison bait. It is best to stir-fry the wheat bran, mix it with chlorpyrifos, toxin, or insecticide, etc., and sprinkle 3-5 grams next to the corn around the wheat straw. For better results, the key is to find the damage in the field in time, and timely irrigation with conditions can also reduce the damage.
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