Efficacy of 1- or 14-day-old field-weathered residues of chlorantraniliprole or spinosad for control of early or late instars of the eastern tent caterpillar (Malacosoma americanum) on black cherry foliage.
| One-day-old residues versus early instarsy | 14-days-old residues versus late instarsx | |||||
|---|---|---|---|---|---|---|
| Treatmentz | No. surviving (of 10) | Frass rating | Leaf area eaten (cm2) | No. alive (of 5) | Frass rating | Leaf area eaten (cm2) |
| Chlorantraniliprole | 2.4 ± 1.2 a | 3.2 ± 0.4 b | 2.0 ± 0.4 a | 2.6 ± 0.4 b | 3.6 ± 0.2 a | 36 ± 5 a |
| Spinosad | 1.6 ± 1.4 a | 2.2 ± 0.4 a | 1.8 ± 0.5 a | 1.0 ± 0.3 a | 3.8 ± 0.2 a | 46 ± 11 ab |
| Untreated | 10.0 ± 0.0 b | 5.0 ± 0.0 c | 4.6 ± 0.9 b | 4.6 ± 0.4 c | 4.8 ± 0.2 b | 72 ±10 b |
↵z Rates as in Table 1. Trials were evaluated 24 hours after larvae were introduced.
↵y Larval cohorts consisted of second and third instars. ANOVA: F2,12 = 19.4, 21.6, 6.1; P < 0.001, P < 0.001, and P < 0.015 for survival, frass, and area eaten, respectively. Means (±SE) not followed by the same letter differ significantly (LSD, P < 0.05).
↵x Larval cohorts consisted of four fourth instars and one third instar. ANOVA (late instar data): F2,12 = 23.2, 8.9, 4.1; P < 0.001, P < 0.001, and P < 0.05 for survival, frass, and area eaten, respectively. Means (±SE) not followed by the same letter differ significantly (LSD, P < 0.05).