Study on Trapping Effect of Pissodes punctatus in Forest Based on Its Phototaxis

LUO Chang-wei; CHEN You; LUO Zheng-fang

doi:10.3969/j.issn.1004-3268.2014.10.018

Abstract：Pissodes punctatus is a destructive stem borer to Pinus armandi and is difficult to control and monitor.This study examined the phototactic behavior of P .punctatus through observation of its phototactic response to different color and then determined the light trapping effects at different intervals,directions and heights in the field.In five colors of LED light trapping,the quantity of trapped P .punctatus was in the descending order as follows:violet, green,yellow,blue and red light.The quantity of trapped weevils by violet light was significantly more than those by trapping lights of other colors.In six colors of color plate trapping,the quantity of trapped P .punctatus was in the descending order as follows:violet,yellow-green, green,yellow,blue and red plate.The quantity of trapped weevils by violet plate was significantly more than those by other colors.The result of color trapping was more consistent with its phototactic response under natural light than that under darkness.There was no significant difference in quantity of trapped weevils among three heights of violet plate trapping,including 1·5 m,3·0 m and 4·5 m.Violet plate trapped more P .punctatus during 12:00-15:00 than that during 6:00-9:00,9:00-12:00 and 15:00-18:00.P .punctatus was trapped more at southward than that at eastward,westward and northward.Thus,P .punctatus can be trapped easily by violet plate at 1·5 m height and southward all day,with the trapped number averagely reaching 1·28 per day by per plate.