Kan suksa chiwa witthaya lae kanchai kapdak baep kaonieo kap phliafai mamuang, Scirtothrips dorsalis Hood (Thysanoptera, Thripidae).
1985
Unchalee Savattum
Biological study of mango thrips, Scirtothrips dorsalis Hood (Thysanoptera: Thripidae) in laboratory indicated that their reproduction were both sexual reproduction and parthenogenetic. The thrips caused damage to every stage of young leaf influorescence and fruit development. In young leaves stages, thrips punctured the epidermal and mesophyll cells of the leaf. The thrips population at the first stage of mango bud had the highest number with an average 284 thrips per leaf cluster at the fifth stage of young leaves (14 days after bud enlarged). Its population decreased to 172 thrips per leaf cluster at the sixth stage of young leaves (21 days after bud enlarged). At influorescence stages, thrips population was indicated as increasing in maximum number at full bloom stage (21 days after enlarged bud) with an average 72.6 thrips per influorescence. The thrips number was decreased to 25.3 per cluster at fruit setting stage (28 days after enlarged bud). Population trends of the thrips on the mango fruits increased from 2.4 per fruit in the early fruitsetting stage to highest population density with an average 10.8 per fruit at the fourth fruitsetting stage (45 days after anthesis) and decreased to 0.4 thrips per fruit in the fifth fruitsetting stage (60 days after anthesis). Different colour sticky board traps with three levels of height were placed in mango field in order to determine their attractive action to thrips. The best sticky coating material was the mixed sticker followed by oil. Among the coating materials (mixed sticker, oil, grease and vaseline), grease was indicated as the lowest effective sticker to capture mango thrips.
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