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The pink citrus rust mite, Aculops pelekassi (Keifer) (Acari: Eriophyoidea), is an important pest in the citrus orchards of Jeju,Korea. This study was performed to investigate the seasonal population abundance of A. pelekassi , and the effects of humidity and citru sleaf age on the multiplication of this pest. Relative humidity (RH) significantly affected the longevity and fecundity of A. pelekassi. Longevity was 7.5, 14.5 and 14.6 d and fecundity was 5.4, 21.5, and 27.1 eggs at 33, 75 and 84% RH, respectively. The leaf age of citrussignificantly affected the multiplication of A. pelekassi. The population abundance on 40 day-old leaves was much higher more than 3 times that on 10-day old leaves at 4 weeks after introduction. Overwintered A. pelekassi adults between the bud scales of the citrus treesbecame active in late April; they were found on newly emerged leaves, followed by their settlement on young fruits in mid-June. The population levels of A. pelekassi peaked on the leaves in late June to July, and on the fruits in early August. The results obtained in thisstudy should be useful for the control of A. pelekassi in citrus orchards in Jeju.Key words: Aculops pelekassi, Citrus, Humidity, Leaf age, Seasonal abundance : (Aculops pelekassi (Keifer))   .        ,       .          .  33, 75, 84%   7.5, 14.5, 14.6  ,  5.4, 21.5, 27.1  .         .  40     , 4  10     3  .       4    5     ( )  , 6    .   6  7  ,  8    .           .: , , ,  , *Corresponding author: dongsoonkim@jejunu.ac.krReceived July 9 2013; Revised August 13 2013Accepted August 20 2013(Aculops pelekassi (Keifer), the pink citrus rust mite) (Eriophyoidea)   (Citrus spp.)    ,  , , , , ,    (Keifer, 1975; Childers and Achor, 1999; Ashihara et al., 2004).     ‘gall mite’, ‘bud mite’  ‘blister mite’  ,         (Keifer et al., 1982).      ()      ,     1

han-guk eung-yong gonchung hakoeji/han'gug eung'yong goncung haghoeji

Effects of Humidity and Citrus Leaf Age on the Multiplication of Aculops pelekassi (Acari: Eriophyoidea) and Seasonal Population Abundances in Citrus Orchards