Pathogen Identification of Leaf Diseases of Louisiana Iris and Screening of Control Agents
WANG Peng
BIE Zhaowei
XIA Lele
Abstract：To accurately prevent and control Louisiana iris leaf diseases,investigations on the occurrence of Louisiana iris leaf diseases,pathogen identification,and screening of control agents were conducted.The susceptible plants of Louisiana iris were investigated,infected leaves were used as pathogen identification materials and 11 fungicides were used as antibacterial agents.The disease resistance of different varieties was evaluated using mechanical sampling method.The pathogen species were identified using tissue separation method,Koch's rule,morphological observation analysis,and molecular biology identification.The antibacterial agents were screened using diffusion method.The results showed that Louisiana iris variety Noble Moment had the strongest disease resistance,and varieties Colorific and Sea knight were more resistant to diseases,Heather Stream,Kristi G,News Brief,Pegaletta had poor disease resistance.The pathogens causing Iris leaf diseases were Fusarium fujikuroi,Cladosporium asperatum,Cladosporium cladosporioides,and Penicillium solidum.The indoor antibacterial toxicity test showed that the 11 fungicides tested had varying degrees of antibacterial toxicity against four pathogenic fungi.Among them,47% Colloidox(WP)had the best comprehensive antibacterial effect,followed by 43% Tebuconazole(SC),with average EC50 values of 0.999 μg/mL,2.395 μg/mL,respectively.
Keywords：Louisiana irisLeaf diseasePathogen identificationControl agentVirulence assay
Publication Date：2023-12-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：9( 107-115 )