宁波市是全国十四个对外开放城市之一,地处浙东沿海,气候温暖湿润,柑桔资源丰富,栽培历史悠久,属长江中下游落叶常绿果树混交带。全市1985年柑桔面积13.5万亩,其中海涂、平原桔园6万亩,山地桔园8.5万亩。由于我市位于中北亚热带季风气候交界区,春夏高温多两,常有6月“霉雨”和9月“秋雨”,桔园杂草生长繁茂,与桔树争夺肥水激烈,又是许多病虫的中间寄主。人工除草费用很大,如象山县柑桔场,全年人工除草用工数占桔园用工总数的42.1％。尤其香附子、喜旱莲子草、狗牙根等恶性杂草很难根除,造成草荒,严重影响柑桔产量和品质。为消灭草荒,为科学生草和除草提供依据,我们在进行化学除草试验和推广的同时,对桔园杂草种类进行初步调查。现将调查结果报告如下: Ningbo is one of the 14 cities open to the outside world in China. It is located in the east coast of Zhejiang and enjoys a warm and humid climate. The citrus is rich in resources and has a long history of cultivation. It belongs to the deciduous evergreen fruit tree mixed belt in the middle and lower reaches of the Yangtze River. The city’s 1985 citrus area of ​​135,000 mu, of which Tauchu, plains Orange Park 60,000 acres, 85,000 acres of mountain orange orchard. As the city is located in the subtropical monsoon climate junction area, the spring and summer heat two, often in June “moldy rain” and September “autumn”, orange weeds grow lush, fights orangefruit intense, but also many diseases Middle host of the worm. Artificial weeding costs a lot, such as citrus fields in Xiangshan County. The annual artificial weed-labor accounts for 42.1% of the total number of work in the Orange Garden. In particular, Cyperus rotundus, Alternaria solani, bermudagrass and other malignant weeds is difficult to eradicate, resulting in grass shortage, seriously affecting the yield and quality of citrus. In order to eliminate the shortage of grass and provide scientific basis for grass-planting and weeding, we carried out preliminary investigations on the weed species in the orange garden while conducting chemical weeding experiments and promotion. Now report the findings as follows: