Avirulent and harmless non-polluting , avoid mosquito-repellent incense , pesticides the harm to human body .

无毒无害无污染，避免蚊香、杀虫剂对人体的危害。

Biological control of cotton verticillium wilt by avirulent fusarium spp.

利用棉花体内非致病镰刀菌防治棉花黄萎病。

Can lead to the replacement of normally avirulent organisms in the oropharynx .

可能导致口咽中正常非致病微生物的替换。

Since since patent of cyaniding dissolve gold came out 1887 , people explores the avirulent technology that extract gold ceaselessly .

自从1887年氰化溶金专利问世以来,人们不断探索无毒提金工艺.