Investigation on the Outbreak of Agrobacterium tumefaciens in the Background of Climate Warming
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摘要: 沟金针虫是我国北方旱作农田的重要地下害虫。近年来华北地区大面积推行保护性耕作措施和作物秸秆粉碎还田,冬小麦+夏玉米一年两熟连续轮作种植,为沟金针虫创造了有利的取食和栖息的环境。地处华北北部的固城站2018—2019年秋、冬、春三季气温出现了冷暖交替,尤其最低气温显著偏高,诱发麦田沟金针虫爆发性发生为害。据春季麦田挖土调查,虫口密度最高达144头/m2;虫口重量最重达18.764g/m2。58个调查点达防治指标5头/m2占98.27%。拔节~收获期调查虫口密度:孕穗期最高、拔节期次之、收获期最低。老熟幼虫虫体最长34.68mm,最宽4.90mm,最长增长4.68mm,最宽增大0.90mm。冬小麦+夏玉米禾本科作物连作种植田间虫口密度达35.3~40.4头/m2,显著高于前茬大豆、玉米、冬小麦休闲地,且花生地、春玉米地比大豆地虫口密度高5倍多,虫口重量高10倍以上。成熟期虫害麦田测产:籽粒减产36.8%,虫口密度增加10头/m2籽粒减产率增加4.824%,虫口重量增加1g/m2籽粒减产率增加3.871%,植株虫害率增加10%籽粒减产率增加11.587%。Abstract: The wheat wireworm is an important underground pest in the dry farming area of northern China. In recent years, large-scale implementation of conservation tillage measures and crop straw crushing in North China, the winter wheat and summer corn are planted in two crops per year, creating a favorable environment for feeding and habituating for the golden worm. The temperature in autumn, winter and spring of Gucheng Station in Hebei Province from 2018 to 2019 showed a phenomenon of low temperature and high temperature alternating between cold and warm, especially the minimum temperature is significantly higher, inducing the explosive occurrence of the golden worm in the wheat field. According to the investigation of spring wheat field excavation, the maximum density of insect population is 144 heads/m2, the maximum weight of insect population is 18.764g/m2. In 58 investigation points, the control index was 5 heads /m2, accounting for 98.27%. The density of insects in the jointing-harvest period was the highest during the booting period, followed by the jointing period, and the lowest in the harvest period. The oldest larvae have a maximum length of 34.68 mm, and a maximum width of 4.9mm, the longest growth is 4.68 mm and the widest is 0.90 mm. The density of insect populations in the continuous cropping winter wheat + summer maize gramineous crops was 35.3 to 40.4 heads / m2, which was significantly higher than that of soybean, corn, and winter wheat recreation grounds, and the peanut and spring corn lands were more than 5 times higher than the soybean insect population density, the weight of insect population was more than 10 times higher. Yield measurement in mature wheat fields: grain yield reduced by 36.8%, insect population density increased by 10 heads / m2, grain yield decreased by 4.824%, insect population weight increased by 1g / m2, grain decreased yield increased by 3.871%, plant pest increased by 10% and grain yield decreased by 11.587%.
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Key words:
- wheat wireworm /
- damage /
- insect density /
- insect weight /
- cause of damage
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