| Based on the collected field data, the spatial distribution pattern of Curculio chinensis larvae was
tested by 8 types of aggregation indices and 2 types of regression equations, the assembling causes were analyzed
with average aggression size, the relationship between its occurrence and environment was analyzed by SPSS. The
results showed that, the spatial distribution pattern of the larvae belonged to the aggregation distribution with density
dependence. The basic component of larval population spatial distribution was a group of individuals, which attracted
one another. The aggregation was caused by both pests biological characteristics and environmental factors. The
population density of larvae was less affected by direction, but greater affected by height level. The harm of fruits by
larvae was most serious at the lower layers, but less at the upper and middle layers. |
