Population dynamics of fruit ï¬‚ies, Bactrocera spp. infesting vegetable crops in Himachal Pradesh, India
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Keywords:Fruit ï¬‚ies (Bactrocera spp.), cue lure, population dynamics, vegetables, weather parameters
AbstractPopulation dynamics of fruit ï¬‚ies infesting vegetable crops was studied from 2011-12 to 2013-14 using cue lure trapsÂ at two locations, Nauni (mid hills) and Neri (low hills) representing two different agro-climatic zones of HimachalÂ Pradesh, India. Three fruit ï¬‚y species viz., Bactrocera cucurbitae (Coquillett), Bactrocera tau (Walker) andÂ Bactrocera scutellaris (Bezzi) were recorded in trap catches. B. scutellaris dominated the trap catches, accountingÂ for 55.0 and 66.7% of the population at Nauni and Neri, respectively, followed by B. tau and B. cucurbitae. ThereÂ were two peaks in fruit ï¬‚y populations, frst during summer (May-June), and second in rainy/post rainy seasonÂ (August- September). The highest population of fruit ï¬‚ies in trap catches was recorded in fourth week of AugustÂ and fourth week of September at Neri (low hills), and Nauni (mid hills), respectively, while it was lowest duringÂ December to February. The species diversity was greater at Nauni (Shannon index of diversity, H-0.9045) than atÂ Neri (H-0.8510), whereas the species dominance was higher at Neri as compared to Nauni. At Nauni, all the threeÂ species exhibited signifcant positive association with maximum and minimum temperatures. The trap caches ofÂ B. cucurbitae and B. tau also showed signifcant correlation with relative humidity. At Neri, however, all the fruitÂ ï¬‚y species showed signifcant positive correlation with minimum temperature, relative humidity and rainfall.
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