Honeybee pollination of loganberries (Rubus loganobaccus L.H. Bailey)

Abstract

The role of honeybees (Apis mellifera) in the pollination of loganberries was studied in an experimental planting at Knoxfield, Victoria. When plants were enclosed in cages to exclude bees and larger insects, there was no difference in the total numbers and weight of fruit harvested. Quality rather than quantity of fruit benefited from honeybee activity. The number of reject fruit on enclosed plants was 49.9% of the total as compared with 7.8% on open plants, corresponding respectively to 35 5% and 3- 3% by weight. The farm gate value of fruit harvested per plant was $A2.39 on open plants and $A1.28 on enclosed plants. After deducting cost of hiring bees this was computed to nett an extra return to the grower of $A1876 per hectare. Honeybees comprised 98.6% of all insect visitors to the flowers. Concentrations of airborne pollen 'were greater inside the cages than outside.