Adult Emergence and Morphometrics of Chinese Citrus Fly, Bactrocera minax (Enderlein) (Diptera: Tephritidae) in Nepal

Pub Date : 2023-02-27 DOI:10.3126/ije.v12i1.52437

B. Regmi, S. Tiwari, Arvind Srivastava, Hom Nath Lamsal, J. Pandit, Shruti Shrestha, S. Pandit, D. Adhikari

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Abstract

Chinese citrus fly, Bactrocera minax is a destructive and univoltine pest of citrus fruits. Geographical altitudinal gradients as well as prevailing climate affect the biology and ecology of insect. Hence, this study aimed to ascertain the effect of altitude on the adult emergence and morphological variations in various ecological settings of Ramechhap district of Nepal from February to June 2021 in citrus orchard. Six altitude ranges were selected in 50 m distance from 1200 to 1500 m above sea level (masl), ranging from 1201-1250 masl, 1251-1300 masl, 1301-1350 masl, 1351-1400 masl, 1401-1450 masl and 1451-1500 masl. The peak adult emergence periods were the 2nd, 3rd, 4th week of April in 1201-1250 masl, 1251-1300 masl, 1301-1350 masl, respectively, followed by 1st, 2nd and 3rd week of May in 1351-1400 masl, 1401-1450 masl, 1451-1500 masl, respectively. Morphometrics of Chinese citrus fly such as weight, length and width of pupa and adult were almost similar to the species collected in various altitudes. The average body length of male Chinese citrus fly adult was 11.58± 0.112 mm while female was 15.57± 0.076 mm. The average wingspan of male was 20.71± 0.285 mm while that of female was 23.14± 0.156 mm. The longevity of adult Chinese citrus fly species increased with increase in altitude. This information could be useful to design an appropriate management plan of Chinese citrus fly in various altitudinal gradients of Nepal.

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尼泊尔柑桔蝇小实蝇成虫羽化及形态测定(双翅目:蝗科)

柑桔蝇(Bactrocera minax)是柑桔类水果的一种破坏性害虫。地理高度梯度和主导气候对昆虫的生物学和生态学都有影响。因此，本研究旨在研究2021年2月至6月尼泊尔Ramechhap地区柑橘园不同生态环境下海拔对成虫羽化和形态变化的影响。在海拔1200 ~ 1500 m的50 m范围内，选取了6个海拔高度区间，分别为1201 ~ 1250、1251 ~ 1300、1301 ~ 1350、1351 ~ 1400、1401 ~ 1450和1451 ~ 1500。成虫羽化高峰期分别为1201 ~ 1250、1251 ~ 1300、1301 ~ 1350的4月第2、3、4周，其次为1351 ~ 1400、1401 ~ 1450、1451 ~ 1500的5月第1、2、3周。柑桔蝇蛹和成虫的体重、体长、宽度等形态计量学特征与不同海拔采集的品种基本一致。雄成虫体长11.58±0.112 mm，雌成虫体长15.57±0.076 mm。雄性平均翼展为20.71±0.285 mm，雌性平均翼展为23.14±0.156 mm。成虫寿命随海拔的升高而增加。研究结果可为尼泊尔不同海拔梯度柑桔蝇的合理管理规划提供参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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