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2012年49 No.4
Occurrence and life-history of Eucryptorrhynchus chinensisin Lingwu，Ningxia
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Key Words： Eucryptorrhynchus chinensis，peak period of adult appearance，Ailanthus altissima，damage characteristics，distribution，Eucryptorrhynchus brandti
Abstract：
- A systemic investigation of the occurrence and life-history of Eucryptorrhynchus chinensis (Olivier) in Lingwu，
Ningxia，found that this species overwinters as adults and larvae in the soil． There are two peaks of adult abundance，the
first when overwintering adults emerge and the second when adults emerge from overwintering pupae． E． chinensis larvae
damage the roots of Ailanthus altissima ( Mill． ) Swingle，stimulating the formation of root nodules that are diagnostic
indicators of damage caused by this pest． A survey of the vertical distribution of larvae and soil-dwelling adults indicated
that about 80% of larvae were found between the soil surface and a depth of 45 cm． In terms of horizontal distribution，
88% of E． chinensis were found in the zone from the base of the trunk to a radius of 75 cm． Based on these results，it
should be most cost-effective to apply pesticide to a depth of not less than 45 cm below the soil surface and to a distance of
at least 75 cm from the base of each trunk． At the end of October and April of the following year E． chinensis began to
burrow into the soil． Therefore，it would be better to apply pesticide in mid-November and mid-April when the soil is
unfrozen． Apart from preventing E． chinensis damage to roots，injection and fumigation are two measures that can be used
to kill Eucryptorrhynchus brandti (Harold) inside the Ailanthus altissima trunk．
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