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河北省易县的中西部属太行山丘陵半山区,气候干旱、少雨,土壤砂性、贫瘠,适宜种植甘薯,但也有利茎线虫(Ditylenchus destructor Thorne)的孳生和为害。甘薯是当地的主要作物之一,近年种植面积保持在4 666.7 hm2左右。其主栽品种有徐薯18(淀粉型)和北京553(鲜食型)。二者均是易感茎线虫病的老品种,再加上多年重茬种植,加重了茎线虫病的
The Midwest of Yixian County, Hebei Province, is a mid-mountain area of the Taihang Mountains. The climate is arid, dry, sandy and barren. It is suitable for growing sweet potato, but also for the breeding and damage of Ditylenchus destructor Thorne. Sweet potato is one of the major crops in the area. The planting area in recent years has remained at around 4 666.7 hm2. The main cultivars are Xushu 18 (starch type) and Beijing 553 (fresh type). Both are old varieties of susceptible stem nematodes, combined with years of continuous cropping, aggravating stem nematode disease