STUDIES ON GEOGRAPHICAL VARIATIONS AMONG FRUIT FLIES, Bactrocera spp. (DIPTERA: TEPHRITIDAE) IN DIFFERENT REGIONS OF NORTH INDIA
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Date
2017
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UHF,NAUNI,SOLAN
Abstract
ABSTRACT
The present investigation on “Studies on geographical variations among fruit flies, Bactrocera
spp. (Diptera: Tephritidae) in different regions of North India” was carried out during 2014-2015 in the
Vegetable Entomology laboratory of the Department of Entomology, Dr. Y S Parmar University of
Horticulture and Forestry, Nauni, HP. Five different geographical regions of North India viz. Solan (1,502
mt amsl), Jaach (733 mt amsl), Pantnagar (344 mt amsl), Ludhiana (262 mt amsl) and Hisar (215 mt amsl)
were selected to study the variations in the developmental and reproductive biology of two species of fruit
fly, viz. Bactrocera cucurbitae and Bactrocera tau under laboratory conditions. The developmental period
of B. cucurbitae was found to be maximum in the Hisar population (15.20 days), whereas it was minimum
in the Ludhiana population (11.75 days). The total developmental period among the five populations of B.
tau was the longest for the Pantnagar population (16.20 days) and shortest for the Jaach (11.60 days)
population. Morphometric dimensions of B. cucurbitae revealed significant differences among populations
of different geographical regions of North India at different developmental stages. Maximum body length
of the adult male and female were observed in the Jaach population (9.11 and11.04mm) and the minimum
in Ludhiana population (8.66 and 10.34mm), respectively. Morphometrical analysis of the B. tau reveal
that in the adult male and female, the maximum length was observed in the Jaach population (9.41 and
11.78mm) and the minimum in Ludhiana population (9.02 and 11.05mm), respectively. Variations in the
fertility parameters of the populations of B. cucurbitae and B. tau collected from five different regions of
North India were observed. The highest value of the true intrinsic rate of increase (rm) was observed in the
Jaach population (0.148) followed by Solan (0.132), Pantnagar (0.130), Hisar (0.117) and Ludhiana
(0.090) populations thus indicating that B. cucurbitae from Jaach region is more generative as compared to
the population from other regions. In B. tau, the value of the true intrinsic rate of increase (rm) was also
found to be highest for Jaach population (0.153) followed by Hisar (0.140), Solan (0.138), Ludhiana
(1.120) and Pantnagar (0.116) thus indicating that the population of Jaach region was the most prolific.
Three species of fruit flies, B. cucurbitae, B. tau and B.zonata (19 isolates) were molecularly characterized
with mtCOI gene and were submitted to GenBank, NCBI (USA) with accession number KX380855-
KX380873. The genetic diversity was too low amongst these populations, considering the geographic scale
of the sampling. Seven tomato varieties were screened for the infestation of fruit fly. Avtar, Rakshita,
Naveen 2000+, US 2853 and Heem Sohna varieties were found to be moderately susceptible to fruit fly
infestation.
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