Phytoparasitica (2001) 29, p. S31 (Mbata et al.)
G.N. Mbata and T.W. Phillips (2001)
Prospects of low pressure for use in the disinfestation of stored products
Phytoparasitica 29 (Suppl.), S31-S31
International Conference on Controlled Atmosphere and Fumigation in Stored Products (Session 1), October 29-November 3, 2000, Fresno, California, USA (not presented at Conference)
Abstract: Effects of low pressure on mortality of different life stages of three stored-product insects, Indianmeal moth (Plodia interpunctella), lesser grain borer (Rhyzopertha dominica), and red flour beetle (Tribolium castaneum), were determined in the laboratory. Insects were exposed to a pressure of 32.5 mm Hg at 25, 33, 37 and 40° C. Adults of all three species were very susceptible to low pressure, and had 100% mortality within 3 h. The immature stages of the lesser grain borer were more tolerant to low pressure and required a longer exposure period for 100% mortality to be achieved. Exposure of eggs of the lesser grain borer to 32.5 mm Hg for 5 days at 25° C did not cause 100% mortality of eggs. All stages of the Indianmeal moth and red flour beetle were killed within 2 days of exposure to 32.5 mm Hg at room temperature. Elevated temperatures reduced the exposure periods required to obtain 100% mortality of the insects. For instance, a temperature of 40° C caused l00% mortality of all stages of Indianmeal moth within 2 h. The exposure periods required to cause 100% mortality at 32.5 mm Hg and the different temperatures investigated ranged from 12 to 175 h for all stages of the lesser grain borer, 2 to 28 h for all stages of Indianmeal moth, and 3 to 28 h for all stages of the red flour beetle. The eggs, being the most tolerant stage for all the insects studied, were investigated further at various combinations of pressures and temperatures.
Database assignments for author(s): George N. Mbata, Thomas W. Phillips
Research topic(s) for pests/diseases/weeds:
control - general
Pest and/or beneficial records:
| Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
|---|---|---|---|---|
| Tribolium castaneum | ||||
| Plodia interpunctella | ||||
| Rhyzopertha dominica |
