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 anthoeyanins (P < 0.0001) and chlorophyll B (P < 0.0001) and the least total nitrogen (P = 0.0283) and Kjeldahl nitrogen (P = 0.0014). Anthoeyanins are known to act as feeding deterrents and bind with nitrogen, which may explain why beetles avoided feeding on 'Monlo' in preference tests.
Original language | English (US) |
---|---|
Pages (from-to) | 1396-1399 |
Number of pages | 4 |
Journal | HortScience |
Volume | 42 |
Issue number | 6 |
DOIs | |
State | Published - Oct 2007 |
Keywords
- Anthoeyanins
- Pest management
- Physocarpus opulifolius
- Resistance