二氧化氯对黄瓜枯萎病的防治效果及黄瓜生长的影响

本试验研究了安全杀菌剂二氧化氯对黄瓜枯萎病的防治效果及防病机理，同时还研究了二氧化氯对黄瓜发芽和幼苗生长影响。结果表明：二氧化氯处理土壤可有效的防治黄瓜枯萎病，二氧化氯浓度越高，防病效果越好。其防病机理为对土壤微生物及黄瓜枯萎病病原菌具有极强的杀灭作用。在二氧化氯低浓度时直接浸种处理对种子发芽率、种子活力指数及芽质量均无抑制作用，但浓度过高则表现出抑制作用，直接浸种处理对幼芽的抑制浓度高于种子催芽后再浸泡处理。先用二氧化氯处理土壤再播种，即使处理浓度达500 mg?L-1对黄瓜幼苗的生长也无不良作用，且该浓度对黄瓜枯萎病的防治效果达96.4%以上。

Effects of Chlorine Dioxide on Cucumber Growth and Fusarium wilt Control

The effects of chlorine dioxide on controlling cucumber(Cucumis sativus L.)Fusarium wilt and cucumber growth were studied.The results indicated that cucumber Fusarium wilt could be controlled effectively by chlorine dioxide and the control effect became much better with the increase of chlorine dioxide concentration.The control mechanism was further studied and it showed that chlorine dioxide could kill microorganism in soil and the pathogen of cucumber Fusarium wilt strongly.When chlorine dioxide was contacted directly with seed in a petri dish,it did not show any negative effect on seed germination at low concentration,and seed vigor and bud weight were normal.When the concentration got higher,its inhibiting effect on cucumber seed germination appeared.The inhibiting concentration decreased,if seed was pretreated with forced sprouting methods before treated with chlorine dioxide.In the pot-experiment,after the soil watered with chlorine dioxide,chlorine dioxide did not damage the growth of cucumber seedling at higher concentration of 500 mg.L-1,and control effect of cucumber Fusarium wilt was 96.4%.