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木瓜实蝇(Bactrocera papayae Drew and Hancock)严重危害多种热带和亚热带经济水果和蔬菜,是许多国家关注的重要检疫性有害生物之一。本文系统研究了磷化氢在低温条件下对木瓜实蝇的毒力。耐受性分析结果表明,木瓜实蝇各虫态对磷化氢的耐受力有很大差别,其耐受能力强弱依次为12 h卵>3龄幼虫>18 h卵和2龄幼虫>24 h卵>6 h卵和1龄幼虫;室内毒力实验结果表明,使用浓度为0.421、0.919、1.372、1.829、2.439和5.335mg/L的磷化氢在5℃下熏蒸木瓜实蝇12 h卵不同时间,其LT99分别为8.046、7.154、6.797、5.78、5.218和3.495 d。以此为依据,推导出死亡率为99%时,熏蒸时间与浓度的关系可表示为C0.558t=K,表明熏蒸时间是影响低温磷化氢熏蒸木瓜实蝇卵的主要因素。本文首次用低温磷化氢对木瓜实蝇卵的熏蒸毒力进行了系统研究,确认了磷化氢低温熏蒸技术在果蔬携带木瓜实蝇的检疫处理中极具应用前景。
Bactrocera papayae Drew and Hancock, one of the most important quarantine pests of concern in many countries, have seriously endangered many tropical and subtropical economic fruits and vegetables. This article systematically studied the toxicity of phosphine to the fruit fly Musca domestica at low temperatures. The results of tolerance analysis showed that the tolerance of phosphomids was very different among the insect states of the fruit flies, and their tolerance was 12 h eggs> 3 instar larvae> 18 h eggs and 2 instar larvae> 24 h eggs> 6 h eggs and 1st instar larvae. The results of laboratory toxicity test showed that the fumigation of P. papaya flies at 5 ℃ for 12 h with phosphine concentrations of 0.421, 0.919, 1.372, 1.829, 2.439 and 5.335 mg / Eggs at different times, the LT99 were 8.046,7.154,6.797,5.78,5.218 and 3.495 d. Based on this, the relationship between fumigation time and concentration can be expressed as C0.558t = K when the mortality rate is 99%. It indicates that the fumigation time is the main factor that affects the hypothermia phosphine fumigation. This article for the first time using low-temperature phosphine on the flesh egg fly fumigation virulence of a systematic study confirmed that the low-temperature phosphine fumigation technology in fruit and vegetable quarantine treatment of papaya Fruit very promising.