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S. Ohno,T. Sasaki,T. Kohama2 한국응용곤충학회 2006 Journal of Asia-Pacific Entomology Vol.9 No.2
We compared the egg-hatching of Euscepes postfasciatus (Fairmaire) with and without moisture treatment to test whether moisture is necessary during egg incubation when a large number of eggs are gathered into a mass. Moisture treatment exhibited significant undesirable effects on hatching (reduction of hatchability, delay of hatching, and increase of the variance of hatching date) compared to no moisture treatment. In addition, moisture treatment significantly increased the incidence of fungus on the egg surface, which can subsequently contaminate the larval artificial diet. Based on these results, we concluded that moisture is not necessary for incubating E. postfasciatus eggs. Two possible explanations for the undesirable effects of moisture on hatching were discussed: a direct effect by preventing respiration of the eggs and an indirect effect through fungal infection of the eggs.
S. Ohno,T. Sasaki,T. Kohama 한국응용곤충학회 2007 Journal of Asia-Pacific Entomology Vol.10 No.3
Mass rearing the West Indian sweetpotato weevil, Euscepes postfasciatus (Fairmaire), using artificial diets is essential for eradicating this serious sweetpotato pest by the sterile insect technique. We tested the use of the furcellaran solution (a viscous liquid, hereafter FS) as an egg-seeding agent on an artificial diet as an important step in extending small- scale rearing of this species to a mass-rearing technique. We recently detected no effect of FS on egg hatching; however, this study revealed significant adverse effects of FS on post-hatching survival and development of the species, i.e. more than 50% reduction in the survival rate and a 1.3- to 1.5-fold extension of the development period. The number of larvae remaining on the diet surface but not feeding into the diet was consistently higher in the FS-treated groups throughout the experiment period. These results suggests that FS may physically or chemically inhibit the normal feeding of larvae, leading to the observed adverse effects on survival and development of insects. The survival rate among FS-treated replicates was significantly related to variations of the diet conditions (shrunk by desiccation) that might be caused by uncontrollable environmental differences. The shrunk diets yielded two to three times more adults than those not shrunk. This implies that post-hatching survival of E. postfasciatus can be improved by drying the contents of the rearing trays after egg-seeding.
Ohno, S.,Sasaki, T.,Kohama, T. Korean Society of Applied Entomology 2007 Journal of Asia-Pacific Entomology Vol.10 No.3
Mass rearing the West Indian sweetpotato weevil, Euscepes postfasciatus (Fairmaire), using artificial diets is essential for eradicating this serious sweetpotato pest by the sterile insect technique. We tested the use of the furcellaran solution (a viscous liquid, hereafter FS) as an egg-seeding agent on an artificial diet as an important step in extending small-scale rearing of this species to a mass-rearing technique. We recently detected no effect of FS on egg hatching; however, this study revealed significant adverse effects of FS on post-hatching survival and development of the species, i.e. more than 50% reduction in the survival rate and a 1.3- to 1.5-fold extension of the development period. The number of larvae remaining on the diet surface but not feeding into the diet was consistently higher in the FS-treated groups throughout the experiment period. These results suggests that FS may physically or chemically inhibit the normal feeding of larvae, leading to the observed adverse effects on survival and development of insects. The survival rate among FS-treated replicates was significantly related to variations of the diet conditions (shrunk by desiccation) that might be caused by uncontrollable environmental differences. The shrunk diets yielded two to three times more adults than those not shrunk. This implies that post-hatching survival of E. postfasciatus can be improved by drying the contents of the rearing trays after egg-seeding.
Ohno S.,Sasaki T.,Kohama T. Korean Society of Applied Entomology 2006 Journal of Asia-Pacific Entomology Vol.9 No.2
We compared the egg-hatching of Euscepes postfasciatus (Fairmaire) with and without moisture treatment to test whether moisture is necessary during egg incubation when a large number of eggs are gathered into a mass. Moisture treatment exhibited significant undesirable effects on hatching (reduction of hatchability, delay of hatching, and increase of the variance of hatching date) compared to no moisture treatment. In addition, moisture treatment significantly increased the incidence of fungus on the egg surface, which can subsequently contaminate the larval artificial diet. Based on these results, we concluded that moisture is not necessary for incubating E. postfasciatus eggs. Two possible explanations for the undesirable effects of moisture on hatching were discussed: a direct effect by preventing respiration of the eggs and an indirect effect through fungal infection of the eggs.