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Bacterial blast, caused by Pseudomonas syringae, is a serious disease of stone fruit crops, affecting both tree health and fruit appearance. Fruitgrowers protect trees by applying copper from leaf fall to early summer using copper in various formulations, rates and times. There is pressure to reduce copper usage because of the potential for its accumulation in soil. Trials conducted over three years showed that copper, applied as copper hydroxide, was not effective in reducing bacterial blast symptoms on fruit, even when applied up to eight times in a season. In contrast, trees that were treated with sulphur produced fruit with signifi cantly less bacterial damage. The benefi t of sulphur on nectarine cv. Fantasia was demonstrated over three years on one site. Sulphur shows potential as a replacement for copper in the nectarine spray programme, but its effect on other stone fruit crops should be confi rmed. The mode of action of sulphur is unclear.

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

Sulphur as an alternative to copper for the control of bacterial blast on nectarine fruit