Wheat midge pests do more harm than good

The wheat midge insects are small in size, highly concealed, and of great danger. One grain of wheat can be used to suck three dry worms. In recent years, outbreaks have occurred in our province in recent years, and some plots have often caused severe production cuts due to untimely control. In recent years, the province has vigorously eliminated the disease, and the density of insect population has dropped from a maximum of 1,000 to 260, but the threat to wheat production has not been eliminated. According to the current large-scale monitoring of plant protection departments across the country, the province has an area of ​​more than 9 million mu, involving more than 60 major wheat producing counties in 8 cities including Handan, Xingtai, Shijiazhuang, Baoding, Hengshui, Zhangzhou, Tangshan and Langfang, and the area Continue to expand, the general population density (101020cm3 soil sample) about 10, serious land up to 260, far exceeding the 2 control indicators. Experience has shown that as long as the hands-on approach is initiated, the prevention and control strategies that emphasize "prevention and control at the flood and adult stages" can fully control the hazards.

First, pay close attention to the prevention and control period

When the larvae of the midge plague (wheat booting phase), they will not eat on the surface of the soil and have the worst resistance to chemicals. At this time, spreading poisonous soil on the soil surface is the best time to eliminate the midge. It is estimated that the crucial period for the prevention and control of toxic soil in the wheat midge during the flood season in the province is April 15-27. The central and southern wheat districts of Handan, Xingtai and Shijiazhuang are from April 15 to 22; the eastern wheat regions of Zhangzhou and Hengshui are from April 18 to April 25: North of Baoding, Tangshan and Langfang, etc. are April 20 to 27 day. Among them, the loamy soil area is 2 to 3 days ahead of the viscous soil area. In the prevention and control process, we must do the following: 1. Select pesticides. With the ban of five high-toxic pesticides such as methyl 1605, ethyl 1605, methamidophos, phosphine amine, and monocrotophos, this year, in accordance with the principle of high efficiency, low toxicity, low residue, and low cost, the requirements for the production of pollution-free agricultural products have been met. , Select demonstration application "5% chlorpyrifos granules (Shandong Huayang Science and Technology Co., Ltd. production)" preparation of toxic on the prevention of midge insects. In order to reduce costs and facilitate the use of the majority of farmers, after consultation with Shandong Huayang Technology Co., Ltd., the "5% chlorpyrifos granules" has been made into a powder, which facilitates the mixing of toxic soils and increases the efficacy of drugs when they are controlled. Second, we must master the amount of medication. After 2006, demonstration experiments were carried out in the main wheat producing areas in Handan, Xingtai, Baoding and Tangshan. The 5% chlorpyrifos granules used in the mu were used to produce 600-900 grams of fine powder and 30 kg of fine soil or fine sand was sprinkled on the surface. Can achieve more than 95% of the control effect, can completely replace the methyl 1605 powder and other highly toxic pesticides. Third, we must do a good job of large-scale unified prevention and control. In view of the short critical period of prevention and control of midge pests, all localities must organize and unify the supply of medicines, and mobilize the farmers for unified time and household prevention and control.

Second, the prevention and control of the adult emergence period

From May 1st to 10th, in the early stages of wheat flowering and grain filling, adults began to emerge and fly to the ears to lay eggs. At this time, spraying was the crucial period before the adult was eliminated. The southern wheat area will enter the prevention and control work on May 1st, and other areas will advance from the north to the south. The control agents can be selected from high-efficiency, low-toxicity and low-residue pesticides such as beta-cypermethrin, chlorfenapyr, chlorfenulfuron, phoxim, acephate, etc., or a half-dosage spray of acephate and acetamiprid, imidacloprid, etc. , Disable highly toxic and high residue pesticides.

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