One-day-old residues versus early instars^{y} | 14-days-old residues versus late instars^{x} | |||||
---|---|---|---|---|---|---|

Treatment^{z} | No. surviving (of 10) | Frass rating | Leaf area eaten (cm^{2}) | No. alive (of 5) | Frass rating | Leaf area eaten (cm^{2}) |

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:*F*_{2,12}= 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):*F*= 23.2, 8.9, 4.1;_{2,12}*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).