Issue:ISSN 2095-1353
CN 11-6020/Q
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2012年49 No.6
A comparison of the supercooling and freezing points of two instars ofinduce overwintering in aphids in the Zhangjiajie Mountains
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Key Words：Zhangjiajie，Schlechtendalia chinensis，supercooling points，body fluid freezing points，overwinter
Abstract： The cold resistance，supercooling points and body fluid freezing points of two instars of Schlechtendalia
chinensis (Bell)were determined using of a supercooling point tester． The average，minimum and maximum values of the supercooling and freezing points of the body fluids of autumn aphids were － 13. 32 ± 0. 77，－ 15. 69，－ 11. 12℃ and － 13. 00 ± 0. 72，－ 14. 54，－ 10. 80℃ ． Average，minimumandmaximum values of supercooling and freezing points of the body fluids of wingless nymph-aphids of S． chinensis were － 18. 95 ± 0. 82，－ 20. 24，－ 17. 02℃ and － 18. 70 ± 0. 82，－ 20. 07，－ 16. 95℃ ． Analysis of variance indicates that wingless nymph-aphids had significantly lower supercooling and body fluidfreezingpoints than autumn aphids． This suggests that wingless nymph-aphids have greater cold tolerance than autumn aphids． The results also indicate that the secondary host of S． chinensis，prostrate light mos(Plagiomnium maximoiczii)，was able to be propagated in small polyester bottles in which autumn aphidsreproducednormally producing aphid-nymphs which successfully produced wax balls in which to spendthecoldwinteruntilemerging the following spring．