Effects of host plant on the low-temperature tolerance of fully-grown larvae and pupae of Bactrocera cucurbitae(Coquillett)
To clarify the differences in supercooling points and low-temperature survival ability of larvae and pupae of the melon fruit fly,Bactrocera cucurbitae(Coquillett),feeding on different host plants,the supercooling point,freezing point of mature larvae and pupae of B.cucurbitae reared for more than 10 generations on Cucurbita pepo,Benincasa hispida and Cucumis sativus were measured under indoor conditions,and their low-temperature survival rate was compared after exposed to 3,6℃ or 9 ℃ for different durations.There was no significant difference in supercooling points of the mature larvae feeding on different host plants.The freezing points of the mature larvae feeding on B.hispida was the lowest[(-5.33±0.23)℃],which was not significant different from those feeding on C.sativus.The supercooling points and freezing points of the pupae feeding on B.hispida was the lowest,and the supercooling points of 1-day-old,3-day-old and 5-day-old pupae were(-19.28±0.30)℃,(-20.97±0.40)℃ and(-20.08±0.46)℃,respectively.The freezing points of 1-day-old,3-day-old and 5-day-old pupae feeding on B.hispida were(-15.06±0.34)℃,(-17.33±0.39)℃ and(-16.39±0.46)℃,respectively.The survival rates of mature larvae feeding on B.hispida and C.sativus were significantly higher than those feeding on C.pepo when exposed to 3,6℃ or 9℃ for one day.When exposed to 3℃ or 9 ℃ for one day,the survival rates of 1-day old pupae of B.hispida population were significantly higher than those of C.sativus and C.pepo populations.The supercooling point,freezing point and low-temperature survival ability of B.cucurbitae can be affected by its host plants.The adaptabilities of the mature larvae and pupae of B.hispida population to low-temperature conditions were better compared to the other populations.
万方数据
维普
