Chemical control of binucleate Rhizoctonia during propagation of Calluna vulgaris in Scotland
1997
Litterick, A.M. | McQuilken, M.P.
Isolates of binucleate Rhizoctonia were found to be moderately sensitive to the fungicides tolclofosmethyl, iprodione, quintozene, benomyl and captan in vitro, (i.e. the concentrations required to give 50% linear growth inhibition were between 1 and 10 micrograms a.i. ml-1). Propagation medium incorporations of tolclofos-methyl, iprodione and captan were evaluated in the glasshouse for efficacy in controlling disease caused by binucleate Rhizoctonia on cuttings of Calluna vulgaris. Tolclofos-methyl and captan gave good control with no phytotoxicity damage when used at 40 and 66 micrograms a.i. ml-1 medium, respectively. Iprodione gave only partial disease control when used at 40 micrograms a.i. ml-1 medium. Further glasshouse experiments that compared different application rates of tolclofos-methyl and captan showed that a reduction in rates from the above resulted in reduced disease control. Increased rates resulted in slight phytotoxicity damage. The efficacy of both tolclofos-methyl and captan were reduced when they were mixed into propagation medium 2-3 weeks before use. The susceptibility of cultivars to infection and their sensitivity to fungicides differed slightly between experiments. The importance of these findings for the integrated control of binucleate Rhizoctonia on ericaceous plant nurseries is discussed.
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