Identification Of Fusarium Formae Speciales On Three Vegetables And The Discovery Of New Diseases In China

Vegetables are indispensable part of our lives.However,due to environmental variation,continuous cropping and the lack of resistant varieties in recent years,vegetable diseases caused by Fusarium spp.have become increasingly complex,which has become an important factor restricting the healthy development of vegetable industry in China.Fusarium spp.exists widely in nature and can infect hundreds of vegetables,which causes a terrible harvest lose in production,even total crop failure.At the same time,Fusarium spp.has complicated and variable genetic characteristics that can be divided into different specialized types and physiological subspecies,which makes the prevention and treatment of diseases more difficult.This study identifies the main specialized types of Fusarium spp.of vegetable systematically based on morphological identification and different host pathogenicity assays combining with molecular analysis.The main results were as follows:1.Identify the types and distribution of Fusarium spp.on vegetable root pathogenic in some provinces.Through the investigation of diseases from 42 regions in 15 provinces in China from September 2016 to February 2019,including Henan,Hebei,Shandong,Shanxi,Beijing and so on,adding to receive and send samples across the country,a total of 197 strains of Fusarium spp.were identified.The host consists of 10 families about 26 kinds of vegetables,such as cruciferous,solanaceae and leguminosae family.Six Fusarium species were identified,including F.solani(Mart.)Sacc.,F.equiseti(Corda.)Sacc.,F.oxysporum Schltdl.,F.proliferatum(Matsush.)Nirenberg ex Gerlach & Nirenberg,F.tricinctum(Corda.)Sacc.,F.sernitectum(Berk.)&Ravenel..2.Identification of Fusarium formae speciales on three vegetables.Based on detailed identification and research of Fusarium specialization in cucurbitaceae,leguminosae and tomato,this study classifies that zucchini root rot is caused by F.solani f.sp.cucurbitae,cowpea root rot is caused by F.solani f.sp.glycines,and tomato wilt is caused by F.oxysporum f.sp.radicis-lycopersici race 1.3.Discover six new recorded host diseases in China,which includes Chinese cabbage root rot caused by F.solani(Mart.)Sacc.,F.equiseti(Corda.)Sacc.and F.oxysporum Schltdl.,Daylily flower rot caused by F.proliferatum(Matsush.)Nirenberg ex Gerlach & Nirenberg,Verticillium wilt of okra caused by Verticillium dahlia Kleb.,and black heart disease of radish caused by V.dahliae Kleb.