THE LETHAL EFFECT OF SUGAR SOLUTIONS ON THE CITRUS NEMA, TYLENCHULUS SEMJPENETRANS COBB

Abstract

Larvae of the citrus nema, Tylenchulus semienetrans Cobb, could be killed to 10096 by immersion in 3096 or 40% of glucose solution for 12 hours, and by immersion in 50% of glucose solution for 3 hours or more. when concentration of the glucose solution was at 60%, one hour’s immersion was able to kill them completely. Larvae immersed in 50% sucrose solution for 24 hours, arid in 60% for 12 or 24 hours were completely killed also. From these results, apparently larvae of the citrus nerna, Tylenchulus semipe netrans Cobb, are highly resistant to the osmotic destruction of sugar solutions, and control of this nema either by addition of sugar to the soil or by dipping the root and of nursery stock in the sugar solution seems to be not practical. 柑桔線蟲之幼蟲浸于30%或40%之葡萄糖液經12小時后，或浸于50%葡萄糖液經3小時以上，或浸于60%葡萄糖液經1小時以上，方可達100%之死亡率。若將其提于50%蔗糖液經24小時，或浸于60%蔗糖液經12小時以上，亦能使其全部死亡，由此觀之，柑桔線蟲之幼蟲必須在甚高之糖液濃度下，方能全部受反慘透作用而致死。故欲施用糖份于土中或用糖液趁根以防治柑桔線蟲，在實際應用上，似乎均難施行。