【摘要】 1973-1978年用从田间病树上采集的柑桔木虱成虫放饲在398株健康柑桔苗上,有32株发病。用病树上采集的柑桔木虱高龄若虫置健苗上所羽化的成虫放饲的56株,有5株发病。未接虫的110株没有发病。初步说明柑桔木虱成虫可以传病。1973-1977年在广西境内的合浦、三江等27个县(市)调查柑桔木虱分布和柑桔黄龙病流行的关系。从总的趋势看,在北部未见木虱的地区,黄龙病不发生或不流行;在南部有木虱的大多数地区,黄龙病就会流行。北部未见木虱的桔林,从柳州重病苗圃引入的苗木,或用其接穗繁殖的苗木或高接的植株,均有发病,但未见蔓延。在南部有木虱分布的地区,有的果园多次喷洒杀虫剂,较好地防除了木虱,黄龙病很少发生。南部的梧州市红旗公社1965年从病区引进苗木,一部分种在地处缓坡丘陵柑桔木虱发生多的果园,1977年调查时大部植株已挖除,余下少数均为重病株。另一部分种在山冲,1977年调查时未见木虱,园中基本无缺株,查80株仅3株发病。上述情况说明黄龙病的流行与柑桔木虱的分布密切相关。因此严格防除柑桔木虱应列为预防黄龙病的一项重要措施。更多还原

【Abstract】 The adult psyllids were collected from the diseased citrus trees andtransferred to young citrus seedlings or budlings in order to test the trans-mission of citrus yellow shoot by the citrus psyllid.In 1973-1978,398 seed-lings and budlings were tested in this manner and 32 plants out of them de-veloped symptoms of yellow shoot. In another experiment, nymphs (mostlyfourth and fifth instars) were collected from the diseased citrus trees andtransferred to young healthy seedlings. When the adults emerged, they weretransferred to young seedlings or budlings in result that 5 out of 56 testplants were diseased. 110 contrelled plants without psyllids developed no sym-ptoms. The preliminary experiment results in that yellow shoot might betransmitted by the adult psyllids. A survey in 27 counties of Kwangsi was made in 1973-1977 to determinethe relation between the occurence of psyllids and the prevalence of citrusyellow shoot. The data obtained show that there is no natural spread of ye-llow shoot and no psyllids in the northern part of Kwangsi. On the otherhand, there usually exist the high population of psyllid in the southern partwhere the yellow shoot disease is epidemic. In some orchards,when in-secticides were frequently used the psyllid might be controlled and the yellowshoot disease was much slighter than those in the orchards without usinginsecticides. It comes to the conclusion that the citrus yellow shoot may beremarkably controlled by wiping out psyllids with insecticides.更多还原