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Additional index words. Physocarpus opulifolius, resistance, anthocyanins, pest management Abstract. Two newly developed cultivars of ninebark (Physocarpus opulifolius (L.) Maxim.), a yellow-leaved cultivar called 'Dart's Gold' and a purple-leaved cultivar called 'Monlo', were compared with the native for resistance to feeding and oviposition by the specialist ninebark beetle (Calligrapha spiraeae (Say)). When offered the choice between two types of ninebark, beetles statistically preferred native (P < 0.0001) and 'Dart's Gold' (P < 0.0001) over 'Monlo', but showed no preference between native and 'Dart's Gold' (P = 0.0743). Long-term performance bioassays showed significantly more eggs on 'Dart's Gold' than 'Monlo' (P = 0.0468). 'Monlo' contained the most anthocyanins (P < 0.0001) and chlorophyll B (P < 0.0001) and the least total nitrogen (P = 0.0283) and Kjeldahl nitrogen (P = 0.0014). Anthocyanins are known to act as feeding deterrents and bind with nitrogen, which may explain why beetles avoided feeding on 'Monlo' in preference tests.

hortscience

Effects of New Cultivars of Ninebark on Feeding and Ovipositional Behavior of the Specialist Ninebark Beetle, Calligrapha spiraeae (Coleoptera: Chrysomelidae)