Seasonal population dynamics of the oriental fruit fly, Bactrocera dorsalis (Hendel), in mango orchards, Cao Lanh city, Dong Thap province

Abstract

This report presents observational results of seasonal variations for nearly one year of the oriental fruit fly, Bactrocera dorsalis (Diptera: Tephritidae), collected using Malaise trap in mango orchards in Cao Lanh city, Dong Thap Province and the seasonal fluctuations of the pest were analyzed. A Malaise-trap was set in the mango orchard from June 2018 through April 2019 in Cao Lanh city, Dong Thap Province to investigate the occurrence of Bactrocera dorsalis. In the study, the total 1,335 specimens collected from a Malaise trap were shown that a strong dominance of Bactrocera dorsalis over the two other fruit fly species, being Bactrocera cucurbitae and Bactrocera zonata was recorded. The species oriental fruit fly, Bactrocera dorsalis, frequently appeared in mango orchards, with low numbers from July 2018 the February of the next year. The number of adult fruit flies markedly increased from mid-March to mid-June. Meanwhile, the number of adults entering traps peaked in mid-June 2018 and early April 2019, depending on the development cycle of mango trees. After that time, the density of fruit fly significantly reduced from early August to December.