firstly canvassed growers on their experiences with Siokra. Most said that weeds were no more difficult to control in Siokra than in Deltapine 90. Both varieties, but especially Siokra, rated highly for their good germination and vigorous seedling growth. However, a few farmers found that Siokra had more weeds than did 90, and occasionally an extra cultivation or herbicide application was given. Yet one well-known Downs grower publicly stated that vigorous weeds like thornapple were easier to spot in Siokra, and this was (another!) good feature of the variety. On balance then I won't differentiate between the two varieties for cost of weed control.