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老鹳草 Geranium carolinianum L.属牛苗科,1987年我市麦田仅零星田块发生,但近几年已上升为麦田主要草害,1992年发生面积达30万亩。危害严重田块多毁种或改种,严重影响小麦生产。为此,我们从1992—1993年对该草田间发生特点、危害损失及药剂防除进行了调查和观察。结果如下:1 材料和方法1.1 出苗规律观察小麦播种后选择有代表性田块2块,每块用三点,每点67cm~2,每五天拔除点内出苗老鹳草。1.2 生长量,每块田固定五点,每点20株,每五天一次,记载株高,叶片数,现蕾,开花,
Geranium carolinianum L. Geranium carolinianum L., 1987 wheat field only sporadic plots occurred, but in recent years has risen to the main wheat crop damage in 1992 occurred in an area of 300000 acres. Harmful plots of more than destroyed or replanted, seriously affecting the wheat production. For this reason, from 1992 to 1993, we conducted a survey and observation on the characteristics of the field, the damage caused by the harm and the control of pesticides. The results are as follows: 1 Materials and methods 1.1 The observation of seedling emergence Select two representative plots of wheat after sowing, each with three points, each point 67cm ~ 2, every five days to remove the point of emergence of geranium. 1.2 Growth, each field fixed five points, each point 20, once every five days, records of plant height, leaf number, budding, flowering,