Efficacy of methyl iodide and synergy with chloropicrin for control of fungi

Efficacy of soil fumigation with methyl bromide and methyl iodide against Botrytis cinerea, Colletotrichum gloeosporioides, Fusarium oxysporum, Gliocladium virens, Phytophthora citricola, Phytophthora citrophthora, Pythium ultimum, Rhizoctonia solani and Verticillium dahliae was determined in labora...

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Bibliographic Details
Published in:Pest management science 2000-05, Vol.56 (5), p.413-418
Main Authors: Hutchinson, Chad M, McGiffen Jr, Milton E, Ohr, Howard D, Sims, James J, Becker, J Ole
Format: Article
Language:English
Subjects:
Biological and medical sciences
Botrytis cinerea
Chemical control
chloropicrin
Colletotrichum gloeosporioides
Control
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
fungicide
Fusarium oxysporum
methyl bromide
methyl iodide
Montreal Protocol
pesticide
Phytopathology. Animal pests. Plant and forest protection
soil fumigation
soil-borne disease
synergism
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Summary:Efficacy of soil fumigation with methyl bromide and methyl iodide against Botrytis cinerea, Colletotrichum gloeosporioides, Fusarium oxysporum, Gliocladium virens, Phytophthora citricola, Phytophthora citrophthora, Pythium ultimum, Rhizoctonia solani and Verticillium dahliae was determined in laboratory experiments in closed fumigation chambers. Pythium ultimum was the most sensitive fungal species with EC50 values for methyl bromide and methyl iodide of 15.5 and 8.6 µM, respectively. R solani was the least sensitive with EC50 values of 253.4 and 161.4 µM for methyl bromide and methyl iodide, respectively. Relative potency ([methyl bromide]/[methyl iodide]) values ranged from 5.2 for P citricola to 1.5 for F oxysporum. Methyl iodide was 2.7 more efficacious than methyl bromide averaged over all fungal species. Methyl bromide/chloropicrin and methyl iodide/chloropicrin applied jointly were 2.2 and 2.8 times more efficacious, respectively, against F oxysporum than when the compounds were applied singly. Combining methyl bromide and methyl iodide with chloropicrin resulted in a significant synergistic increase in activity against F oxysporum. © 2000 Society of Chemical Industry
ISSN:1526-498X
1526-4998
DOI:10.1002/(SICI)1526-4998(200005)56:5<413::AID-PS140>3.0.CO;2-J