Reduced sensitivity to carbendazim in isolates of <i>Botrytis allii</i>
AbstractFifty isolates of Botrytis allii causing onion botrytis neck rot were obtained from onion seed and bulbs throughout New Zealand and tested for their sensitivity to carbendazim (benzimidazole) fungicide in a mycelial growth study Agar plates amended with carbendazim at 6 or 8 different concentrations were inoculated with an 8 mm disc of mycelium of each of the isolates and incubated in the dark at 20C Radial growth of the colonies was measured after 4 days EC50 (effective concentration required to give half of maximum growth) values were estimated by fitting logistic curves with growth as a proportion of the maximum growth Of the 50 isolates 16 were identified as resistant 32 as sensitive and two had a variable response The estimated EC50 values for the isolates that were sensitive ranged from 0006 to 0053 g/ml active ingredient It is recommended that New Zealand onion growers closely follow the current benzimidazole resistance management strategy
How to Cite
Viljanen-Rolinson, S.L.H., M.V. Maroni, and R.C. Butler. “Gt”;. New Zealand Plant Protection 60 (August 1, 2007): 108–113. Accessed December 3, 2023. https://journal.nzpps.org/index.php/nzpp/article/view/4634.