ISHS Acta Horticulturae 112: Symposium on Breeding and Machine Harvesting of Rubus
PEST MANAGEMENT OF LEAFROLLERS IN CANEBERRIES GROWN IN OREGON |
| Author: | Rufus S. La Lone |
| Abstract:
Sex pheromone traps were used in 1978 and 1979 to monitor the adult flight activity of the Orange tortrix, Argyrotaenia citrana (Fernald) (Lepidoptera: Tortricidae), and the Obliquebanded leafroller, Choristonuera rosaceana (Harris) (Tortricidae), in caneberries grown in Oregon. Data presented are for trap catches in red raspberry fields. Obliquebanded leafroller flight activity began in the 1st week of June. The peak flight periods occurred ca. 15 June and 15 July in 1978, and ca. 1 July and 1 September in 1979. The number of moths caught/wk during these periods ranged from 50 to over 160. In 1979, Orange tortrix moth flight activity began in mid-May, a month later than in 1978. In both years, the most critical moth activity occurred in early June and resulted in the presence of larvae during red raspberry harvest. Additional flight peaks occured in late August and mid-September in 1979. The number of moths caught/wk during the peak flight periods ranged from 1 to over 140. Moth catches were directly related to larval numbers found in the field. Field observations indicated that a rudimentary economic threshold level for Orange tortrix in red raspberries lies between 20 and 50 moths/wk/trap during the peak period. In the fields where moth catches were below these figures (2/3 of the hectares), no insecticide sprays were used. Where above, malathion gave satisfactory control when applied 10 days following the peak flight in June. | |
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