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Grey mould of boysenberries (Rubus hybrid) caused by Botrytis cinerea has caused substantial fruit losses in New Zealand when conditions favour disease development. Flower infection in spring is believed to be an important stage in the epidemiology of B. cinerea in boysenberry blocks, but there is little information on the relationship between flower infection and fruit rot at harvest. In the 1995/96 growing season, unsprayed fully opened flowers of hybrid berry Waldo and Boysen were dusted with conidia of B. cinerea in field and shadehouse experiments, respectively. Inoculation of flowers resulted in greater incidence (P<0.01) ofberry rot compared to the uninoculated control treatments. Culturing from plant tissue confirmed that B. cinerea was present in the styles and drupelets of inoculated flowers throughout the growing season. Infection of styles was closely correlated with infection of drupelets (P<0.00l), although incidence of the fungus was greater in the styles than the drupelets (P<0.05). The results suggest that grey mould of Rubus hybrid berries is caused by Botrytis propagules in the styles and/or latent infection of drupelets. However, berry rot may also be due to Botrytis inoculum trapped between developing drupelets.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Does inoculation of hybrid berry flowers (<i>Rubus</i> spp.) with <i>Botrytis cinerea</i> cause berry rot?