| Popis: |
1. The abilities for sublethal concentrations of mastoparan, bradykinin, and Vespula venom to disrupt ingestion and utilization of food were determined in the fourth instar Heliothis zea . 2. Mastoparan and Vespula venom severely decreased the metabolic efficiency for conversion of nutrients to biomass, thus, reducing larval growth rate. Although bradykinin reduced larval feeding, a stable growth rate was maintained due to increased metabolic efficiency. 3. The ld 50 s of mastoparan and Vespula venom in H. zea larvae were 40 and 41 μg/larva, respectively. Each caused a spastic-contractile paralysis when injected, suggesting neurotoxicity. |
