牵牛星防治锈壁虱有特效我场有柑桔成年投产树２５０多亩，往年柑桔锈壁虱为害非常严重，锈（黑）果一般占２５％～３０％。１９９３年选用新农药２０％牵牛星可湿性粉剂４０００～４５００倍液，全年喷药４次，结果全场柑桔总产达３０多万ｋｇ，锈果率降至１．５％左右，... Albinus Allelopathy Effects There are 250 mu of citrus adults put into operation in the field. In the past, citrus rust ticks were very serious, and rust (black) fruit generally accounted for 25% to 30%. 1993 selection of 20% Alkalis Alba Alba WP 4000-4,500 times the liquid spray throughout the year 4 times, the results of the total citrus output of more than 30 million kg, rust rate dropped to about 1.5% ...