Biological Study of Cucurbit Fruit Fly, Dacus ciliatus (Loew) on Constant Temperatures

Ouda, I., M. M., Fatina Baiomy
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Abstract

of the cucurbit fruit fly Dacus ciliates (Loew) (Diptera: Tephitidae) was studied at constant temperatures (15, 20, 25 and 30 ± 1 ̊ C). The development of immature stages was accelerated by rising of tested temperatures. Development stages average of eggs, larvae, pupal and pre-oviposition period ranged between (31.13 and 3.47), (37.07 and 5.80), (30.27 and 7.20) & (33.13and 5.73) days on 15 and 30 ̊ C, respectively. Also, total immature stages ranged between 98.47 and 16.47 days on 15 and 30 ̊ C, respectively. Whereas, Generation period ranged between 131.60 and 22.20 days on 15 and 30 ̊ C, respectively. Additionally, adult females survived slightly longer than males, also life span, and sex ratio. While the estimated (t o ) threshold temperatures stages eggs, larval, pupal and pre-oviposition period were 15.05, 13.39, 10.64 and 13.11 heat units (U.T.) at 15, 20, 25 and 30 ̊ C ±1 ̊ C, respectively. Based on 30 ̊ C estimations are required to complete the development of all immature stages. Also, Thermal requirements (K) D.D. ' s were estimated to be 58.35, 97.07, 133.58 & 103.81 for eggs, larval, pupal and pre-oviposition periods at 15, 20, 25 and 30 ̊ C ±1 ̊ C, respectively. And development for one generation required 386.17 D.D′s, The study showed that with the identif ication of threshold temperatures (t o ) and thermal units (K) for generation calculated nine expected generations in the field they: two generations in spring, four generations in summer, two generations in autumn, one generation in winter.
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瓜类果蝇Dacus ciliatus (low)在恒温环境下的生物学研究
研究了恒温(15、20、25和30±1℃)条件下瓜类纤毛虫(Dacus ciliates (low),双翅目:纤毛虫科)幼体的发育情况。15℃和30℃时,卵、幼虫、蛹和产卵前期的平均发育阶段分别为31.13 ~ 3.47、37.07 ~ 5.80、30.27 ~ 7.20和33.13 ~ 5.73 d。在15和30℃时,总未成熟期分别为98.47天和16.47天。而在15℃和30℃时,产生周期分别为131.60 ~ 22.20 d。此外,成年雌性的寿命和性别比也比雄性略长。在15、20、25和30℃±1℃条件下,卵期、幼虫期、蛹期和产卵前期的阈温分别为15.05、13.39、10.64和13.11个热单位(u.t)。根据30℃的估算,需要完成所有未成熟阶段的发育。另外,热要求(K) D.D.在15、20、25和30℃±1℃时,卵期、幼虫期、蛹期和产卵前期的虫密度分别为58.35、97.07、133.58和103.81。研究表明,通过对一代起始温度(t o)和热单位(K)的确定,计算出田间9代的预期代数:春季2代、夏季4代、秋季2代、冬季1代。
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42
审稿时长
5 weeks
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