Seasonal Abundance of Economically Important Fruit Flies (Diptera: Tephritidae: Dacinae) in Bangladesh, in Relation to Abiotic Factors and Host Plants

Hossain, M. Aftab
Leblanc, Luc
Momen, Mahfuza
Bari, M. Abdul
Khan, Shakil Ahmed
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Hawaiian Entomological Society
Fruit fly monitoring traps baited with male lures (cue lure, methyl eugenol, zingerone) were maintained for two years (Nov 2016–Oct 2018) at ten sites (reduced to three on year two), in village-style subsistence agriculture envi- ronments, at the Atomic Energy Research Establishment campus, Savar, Dhaka, Bangladesh. A total of 15 species and 135,034 flies were collected, dominated by polyphagous fruit pest Bactrocera dorsalis (58.0% of all trapped flies), cu- curbit pests Zeugodacus cucurbitae (23.6%) and Z. tau (13.5%), and non-pest B. rubigina (3.6%). Three other pest species, collected in much smaller numbers, were polyphagous fruit pests B. zonata and B. correcta and cucurbit pest Dacus longicornis. Data was used to document the seasonal abundance of the above- mentioned species, in relation to host fruit availability and abiotic factors. Seasonal abundance of B. dorsalis, with peaks during wet summer months, was positively correlated with rainfall (r=0.70), temperature (r=0.66) and host availability (r=0.72). Seasonal trends in captures of B. zonata and B. rubigina were similar to those of B. dorsalis. Captures of Z. cucurbitae peaked in March 2017, early in the rainy season, and May 2018, in the middle of the rainy summer season, with no clear correlation with rainfall, humidity, or host availability. Captures of the two other cucurbit pests were inversely related to rainfall, with abundance peaks during the dry winter months. Data on seasonal abundance of these species will be utilized in formulating an area-wide pest management strategy in the agro-ecological system under consideration.
Proceedings of the Hawaiian Entomological Society (2019) 51(2):25–37
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