Chemical weed control in newly planted raspberries in coastal British Columbia.
In 1980-84, 4.48-8.97 kg napropamide/ha applied to newly planted raspberries controlled Poa annua and Echinochloa crus-galli, but was less satisfactory against broadleaved weeds. Higher rates were more effective only when Polygonum persicaria and Capsella bursa-pastoris were the major weeds. 1.12-2.24 kg simazine or 0.67-2.24 kg terbacil controlled grasses and broadleaved weeds, but terbacil was less satisfactory where Senecio vulgaris and Matricaria matricarioides [Chamomilla suaveolens] predominated. There were significant year × herbicide × planting method interactions for yield and plant vigour. In some cases herbicide treatment caused temporary crop injury. Combined treatments with lower rates of napropamide + simazine or terbacil gave broad spectrum weed control without crop injury.