The underground disribution of the larvae of Abirus fortunei (Baly) in hybrid mulberry fields and common mulberry fields were investigated. The results showed that the spatial distribution of the beetles conformed to negative binomial distribution, the spatial pattern was an aggregative one, and the basic component of distribution was the colony. 70.4% and 62.1% of the larvae were found 31~50cm and 11~30cm underground respectively in hybrid mulberry fields, and 62.1% and 26.1% at the same vertical ranges in...