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Distinguishing larval instars of Melon Fly,Bactrocera cucurbitae(Diptera:Tephritide)

Li Ziling1,Huang Shusheng2,Wang Yuqun1,Zeng Dongqiang1*,Wei Shudan1(1.College of Agriculture,Guangxi University,Nanning 530005,China;2.Plant Protection and Quarantine Station of Nanning City)  
Bactrocera cucurbitae had three instars in larval stage.Three morphological characters,the body length,the length and width of mouth hook were measured at different instars.The results showed that the average length of body for 1st,2nd and 3rd instar were 2.9224 ± 0.1196 mm,5.2422 ± 0.3067 mm,9.3035 ± 0.2300 mm,respectively,the average length of mouth hook were 0.0818 ± 0.0012 mm,0.1503 ± 0.0020 mm,0.2636 ± 0.0022 mm,respectively,and the average width of mouth hook were 0.0469 ± 0.0007 mm,0.0777 ± 0.0009 mm,0.1280 ± 0.0011 mm,respectively.The length and the width of mouth hook had not any overlap between larval instars,suggesting that they could be the morphological characters for distinguishing larval instars of B.cucurbitae.
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