Abstract
Abstract Powdery scab, caused by Spongospora subterranea (Wallr.) Lagerh. f. sp. subterranea Tomlinson, has become an increasingly important problem on potatoes grown in New Zealand in recent seasons. During the 1992/93 season, the efficacy of 25 chemical seed tuber treatments against tuber‐borne inoculum of S. subterranea was tested in a field trial. Four treatments (stored treatments) were applied 6 weeks before planting whereas 21 were applied within 24 h of planting. Treatments were applied to tubers of cultivars ‘Agria’ (which had severe powdery scab infection) and ‘Rua’ (light infection). Plant emergence was assessed and tubers from the subsequent crop were harvested and scored for powdery scab infection. Yield parameters were also determined. Mancozeb, formaldehyde solution, fluazinam, propineb, dichlorophen‐Na, and mixtures of maneb + zinc oxide, mancozeb + zinc oxide, propineb + zinc oxide, fluazinam + zinc oxide, and tolclofos‐methyl + cupric hydroxide, applied to ‘Agria’ tubers just before plan...
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