Susceptibility of twenty potato cultivars to the potato moth at Pukekohe: A preliminary assessment

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Abstract
In a field study 20 potato cultivars were compared for relative levels of foliar and tuber infestation caused by the potato tuber moth (Phthorimaea operculella (Zeller)). All became seriously infested and showed no evidence of resistance. ‘Wha’, ‘Ono’, and ‘1584c10’ were the least seriously affected cultivars when assigned a performance rank based on a combination of foliage mining intensity, level of table grade tuber infestation, and total tuber yield. Varieties with a prolonged upright growth habit and few leaves close to the soil surface sustained low foliage mining populations. Light tuber infestation was also associated with plant growth habit, such as deeper tuber set, rather than with true resistance.

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