An alternative fungicide to benomyl for the control of green mould in citrus

Before 1970, only one example of acquired resistance to fungicides in pathogen populations was recorded in New Zealand. This was resistance in Pyrenophora avenae to mercury-based fungicides. Since 1970, acquired resistance to fungicides in pathogens has become a major problem in disease control. Several pathogens have acquired resistance to benzimidazoles; Botrytis cinerea and Monilinia fructicola to dicarboximides; Phytophthora infestans to acylalanines; Penicillium ita/-icum to guazatine; and Pyrenophora teres to triazoles. Observations on the ability of resistant strains to persist in the absence of selection and suggested strategies for prolonging the effective life of the fungicides are reviewed.

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Double resistance by citrus green mould Penicillium digitatum to the fungicides guazatine and benomyl

Wild¹

1983

Annals of Applied Biology

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In vitro dosage response data with different isolates of Penicillium digitatum and the fungicide guazatine indicated an approximate 10-fold shift in tolerance when compared with wild type strains. ED,, values for resistant strains were approximately 0.5 pglml compared to approximately 0.05 pglml for the wild type strains. Colony growth of guazatine resistant isolates on selective media containing carbendazim showed that they were also resistant to the benzimidazole group of fungicides. In vivo tests in inoculated oranges with strains previously characterised by in vitro tests confirmed resistance to guazatine and benomyl. A combined treatment of these fungicides at 400 pg/ml and 500 pg/ml respectively, which normally gives protection against decay, also failed to provide adequate mould control. Growth and pathogenicity of the resistant strains in these tests in oranges were indistinguishable from that of wild type strains.

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An alternative fungicide to benomyl for the control of green mould in citrus

Cited by 3 publications

References 1 publication

Development in New Zealand of resistance to dicarboximide fungicides inBotrytis cinerea, to acylalinines inPhytophthora infestans, and to guazatine inPenicillium italicum

Development in New Zealand of resistance to dicarboximide fungicides inBotrytis cinerea, to acylalinines inPhytophthora infestans, and to guazatine inPenicillium italicum

Resistance of plant pathogens to fungicides in New Zealand

Double resistance by citrus green mould Penicillium digitatum to the fungicides guazatine and benomyl

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