Effect of Gamma Irradiation on Egg
Hatchability, Adult Survival and Longevity
of the Mango Pulp Weevil, Sternochetus frigidus (Fabr.)
Glenda B. Obra1, Sotero S. Resilva1 and Louella Rowena J. Lorenzana2
1Agriculture Research Section, Atomic Research Division,
Philippine Nuclear Research Institute, Department of Science and Technology,
Commonwealth Avenue, Diliman, Quezon City
2Department of Agriculture, Regional Field Office MIMAROPA,
3rd Flr. ATI Building, Elliptical Road, Diliman, Quezon City
*Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.
ABSTRACT
The effect of irradiation on egg hatchability, adult survival and longevity of Sternochetus frigidus (Fabr.) was studied using different doses of gamma radiation. Irradiation lowered egg hatchability, longevity and survival rates of S. frigidus. Response of males and females in terms of longevity and survival rates differed at sub-efficacious and efficacious doses. The study shows that the use of phytosanitary irradiation against S. frigidus results in a lowered risk that adults would be detected by survey programs as irradiation at doses resulting from commercial phytosanitation reduces longevity drastically, and that use of radiation induced sterility for SIT may not possibly work on this pest.
INTRODUCTION
Mango pulp weevil, Sternochetus frigidus (Fabr.), a quarantined pest in Palawan, has prevented the export of mango (Mangifera indica L.) from the Philippines to the USA and other countries with strict quarantine regulations other than those obtained from Guimaras Island, which is certified seed weevil- and pulp weevil-free (Proclamation No. 314, 1993). S. frigidus was found in 1987 in the southernmost towns of Bataraza and Brooke’s Point in Palawan (Basio et al. 1994), an archipelagic and the largest province in the western Philippines. . . . read more
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