Hydroprene Prolongs Developmental Time and Increases Mortality in Wandering-phase Indianmeal Moth (Lepidoptera: Pyralidae) Larvae

• Published in: Journal of economic entomology 2006-08, Vol.99 (4), p.1509-1519
• Main Authors: Mohandass, S., Arthur, F. H., Zhu, K. Y., Throne, J. E.
• Format: Article
• Language: English
• Subjects: Animals; Biological and medical sciences; Control; development; duration; Fatty Acids, Unsaturated - pharmacology; Fundamental and applied biological sciences. Psychology; Generalities; hydroprene; Indianmeal moth; insect control; insect growth regulator; insect growth regulators; Insecta; Invertebrates; Juvenile Hormones - pharmacology; Larva - drug effects; larvae; larval development; mathematical models; mortality; Moths - drug effects; Phytopathology. Animal pests. Plant and forest protection; Plodia interpunctella; Population Dynamics; Protozoa. Invertebrates; response surface methodology; storage insects; STORED-PRODUCT; temperature; Time Factors
• ISSN: 0022-0493; 1938-291X
• DOI: 10.1603/0022-0493-99.4.1509

Wandering phase Indianmeal moth, Plodia interpunctella (Hübner), larvae were exposed to the label rate of hydroprene (1.9 × 10−3 mg [AI]/cm2) sprayed on concreted petri dishes. Larvae were exposed for 1, 3, 6, 12, 18, 24, and 30 h and maintained at 16, 20, 24, 28, and 32°C and 57% RH until adult emergence. Larval developmental time and mortality were significantly influenced by temperature and exposure intervals. Maximum developmental time (47.2 ± 1.3 d) occurred at 16°C, and the minimum developmental time (7.0 ± 0.5 d) occurred at 32°C. Larval mortality generally increased at all of the five tested temperatures as exposure period increased. The greatest mortality (82.0 ± 0.1%) occurred when larvae were exposed for 30 h at 28°C, and minimum mortality (0.0 ± 0.5%) occurred at 16°C when larvae were exposed for 1 h. The relationships between temperature, exposure period, and developmental time were described by polynomial models, based on lack-of-fit tests. Hydroprene has potential to be an effective alternative to conventional insecticides in surface treatments for Indianmeal moth management. Response-surface models derived from this study can be used in simulation models to estimate the potential consequences of hydroprene on Indianmeal moth population dynamics.