Main technical contents: In order to minimize the harm of corn borer, the comprehensive control of corn borer using biological, physical and chemical control techniques such as Trichogramma, sex attractant, Beauveria bassiana, high-pressure mercury lamp and so on are adopted in accordance with local conditions. (1) Trichogramma control: 1. Release time: When the overwintering rate of corn borer reaches 20%, push it back for 10 days for the first release of bee period, and then release the bee for the first time after 5-7 days. . 2. Release quantity: 15,000 Trichogramma per mu, the first release of 07,000 heads, and the second release of 0.8 million heads. 3, release points: set a release point per acre, when released, but also according to the wind direction, wind speed set point, such as wind speed, should be appropriate to increase the number of points and release, the downpour can be reduced appropriately. 4, release method: First, according to the amount of bees, put the number of bees and the number of effective Trichogramma bees, the Trichogramma finished product bee card was torn into small pieces, with straw or needle thread stitching (sew) in the bee point corn plant The back of the middle blade is 1/3 from the base. (ii) Sex attractant: In the main places where corn stubble is ploughed, such as wheat fields, soybean fields, and wastelands around the corn fields, 15 traps are set per hectare, and tripods made of wooden poles and bamboo poles support the fields. For crops 10-20cm. The trapping time is from June 21 to July 31 in the central region and from June 1 to July 10 in the western region. (III) Prevention and control of Beauveria bassiana: In the middle and late May of wintering, the winter-old corn borer is used to seal off the Beauveria bassiana before it matures. Calculate the volume of corn stalk maggots, calculate the amount of 0.25 kg of Beauveria bassiana powder per cubic meter of spores containing 3 billion live spores, and make bacteria powder at a ratio of 1:10 (fine earth or other fillers). use. On the side of corn stalks, use a wooden stick to cross the tunnel every one meter or so. Insert the nozzle of the Taishan (or Dongfanghong-18) backpack-type motorized duster into the hole and spray it. Wait until the opposite (or Above) When the white smoke is emitted, stop the powder spraying, and then spray the other positions. Repeatedly until the complete spray is finished. (IV) Prevention and Control of High-pressure Mercury Lamps: In open areas more than 15 meters away from houses in villages and villages in the main maize producing areas, a high-pressure mercury lamp is set on 16 hectares of corn, and a medicine pool is set up to utilize the phototaxis of corn borers. In the western region, the time for lighting is from mid-late June to mid-July, and the central region is from late June to late July. Turn on the light at 8:30 every night and turn off the light at 4 o'clock in the morning.
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