Abstract
Development and survival of beet armyworm, Spodoptera exigua (Hubner) on five cultivars of chrysanthemum, Dendranthema grandifora Tzvelev, were evaluated. Two laboratory trials, initiated on 4- and 6-wk-old plants, were conducted on ‘Dark Chip’, ‘Hoof Lane’, ‘Pink Marble’, ‘Statesman’, and ‘Westland Snow’. Regardless of plant age, survival was highest on ‘Dark Chip’ and lowest on ‘Hoof Lane’ and ‘Pink Marble’. Significant differences in developmental time and pupal weight were found among the cultivars. Total developmental time (egg eclosion to adult emergence) on 4-wk-old plants was ≈6 d longer for larvae fed ‘Hoof Lane’ compared with ‘Dark Chip’. Furthermore, development on 6-wk-old plants was lengthened ≈8 d for individuals fed ‘Statesman’ and ‘Westland Snow’ and 2.5 d for larvae fed ‘Dark Chip’. In addition to protracted development, pupal weight was significantly lower for individuals reared on ‘Hoof Lane’. Significant differences in both percentage moisture and total nitrogen were found among the five cultivars. These differences, however, were not consistent with host suitability. The differential performance of S. exigua among the five cultivars underscores the potential of host-plant resistance in commercial chrysanthemum production.
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