The attracting effects of the fifteen volatile components emitted from tea shoots and tea flowers on alate tea aphid, Toxoptera aurantii, were measured by four-arm olfactometer and electroantennogram (EAG). The result showed that in those odors (Z)-3-hexen-1-ol, (E)-2-hexenal, methyl salicylate, linalool, n-octanol and hexanal as well nerol and allyl isothiocyanate, the main aroma components from tea flowers showed significant attracting effect on the winged tea aphids. The difference in aphid number attracted by 2 doses of 10-4βg/ml and 10-2βg/ml of 15 components was obvious in olfactometer bioassay. EAG responses showed that: ① the EAG value by the odor from the fresh 1st leaf below the bud was largest; ② Simulating the “green leaf volatiles”, a mixture composed of 10-2βg/ml n-hexanol, n-pentanol, 1-penten-3-ol, 2-penten-1-ol, (E)-2-hexenal, (Z)-3-hexen-1-ol and (Z)-3-hexenyl acetate according to ratio of 1∶1∶1∶1∶1∶1∶1, could elicit strong EAG responses; ③ the odor from aphid-damaged tender stem repelled tea aphids. It was supposed that the green leaf volatiles and methyl salicylate liberated from tea shoots and tea flowers play a role of attracting lures in alate tea aphids foraging and orienting to tea shoots, and the aphid-damaged tea shoots maybe emit infochemicals to dispel tea aphids.
HAN Bao-yu
,
ZHOU Cheng-song
. Attracting Effect of Volatile Infochemicals from Tea Shoots and Flowers on Winged Tea Aphids[J]. Journal of Tea Science, 2004
, 24(4)
: 249
-254
.
DOI: 10.13305/j.cnki.jts.2004.04.005
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