Distribution of Japanese Pear Scab Fungus, Venturia nashicola, Susceptible to a DMI Fungicide in Tochigi Prefecture

Abstract

Monoconidial isolates of Venturia nashicola were collected in 1999 from ten pear orchards in Tochigi Prefecture and their susceptibility to the DMI fungicide fenarimol was determined by mycelial growth tests. Results on PDA plates showed that DMI-resistant isolates occured at 5.9% on average and suggested that field performance of this fungicide is still maintained in Tochigi Prefecture.