VIEW ARTICLE

Reduction of Macadamia Nut Set by Botrytis cinerea. J. E. Hunter, Associate Plant Pathologist, University of Hawaii, Beaumont Agricultural Research Center, Hilo 96720; R. K. Kunimoto, Research Assistant, University of Hawaii, Beaumont Agricultural Research Center, Hilo 96720. Phytopathology 63:939-941. DOI: 10.1094/Phyto-63-939.

Macadamia racemes sprayed with a spore suspension of Botrytis cinerea immediately after anthesis produced very few nuts in comparison with racemes sprayed with water. Under conditions of natural inoculation in the field, racemes treated with benomyl to control Botrytis blight produced significantly (P = .01 level) more nuts than racemes treated with water. Significant negative correlation and regression values indicate that Botrytis blight is associated with a decrease in nut set on macadamia racemes.