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Under laboratory conditions,preference of adult Asian Citrus Psyllid(ACP),Diaphorina citri Kuw,for infestation among 13 citrus varieties was determined with two experimentations.Experiment A applied every 2 detached shoots of different citrus varieties and put together for choice.Experiment B used the detached shoots of all tested citrus varieties and put together for choice.The results of Experiment A revealed that the percentage of ACP adults on each shoot of Citrus sinensis(L.) Osbeck cv.Earlygold and C.medurensis(C.mitis) cv.Varigated Calamondin were 23% and 1%,respectively,which was significantly different from each other.The percentage on C.sinensis Osbeck cv.Taiwanmeiguicheng(33%) and cv.Newhall Navel Orange(20%) were also significantly different from each other.Significant different percentages of ACP adults were also observed between C.reticulata C.paradisi cv.Rihui(38%) and C.reticulata C.grandis cv.Page(15%).In Experiment B,the number of ACP on the shoots of C.sinensis Osbeck cv.Newhall Navel Orange,C.tangerina Tanaka cv.Fuju and C.reticulata Citrusgrandis cv.Page was 3.2-6.6 adultshoot-day-1,which were significantly higher than that on the shoots of the other 10 citrus varieties.
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