Abstract: In May-September, 2011, a field survey was conducted to study the diversity and seasonal distribution pattern of True Bug (Heteroptera) population in Kunyu Mountains of China. By using the improved ground surface insect flight interception traps, a total of 519 True Bug specimens belonging to 30 species and 8 families were collected from 40 standard plots. Among the collected specimens, Pentatomidae had the largest number of species (13 species), whereas Reduviidae had the largest number of individuals. The comparative analysis on the species composition and diversity of True Bug in Pinus thunbergii forest, P. densiflora forest, Larix kaempferi/Cunninghamia lanceolata forest, coniferbroadleaf forest, and broadleaf forest in the Mountains showed that the diversity of True Bug was the lowest in L. kaempferi/C. lanceolata forest, and the species composition in this forest was not similar to that in the other four forests. The canonical correspondence analysis (CCA) showed that the most important factors affecting the spatial distribution of True Bug were elevation and stand density. The seasonal distribution pattern of the True Bug in the Kunyu Mountains could be classified into four types, i.e., typeⅠ (appeared throughout the sampling periods, n=8), typeⅡ (only appeared in early sampling period, n=9), type Ⅲ (only appeared in medium sampling period, n=6), and type Ⅳ (only appeared in mediumlate sampling period, n=7). The abundance of the True Bug presented a singlepeak distribution pattern, with the largest individual number in mid and late July and the smallest one in late September. The species richness had a similar seasonal variation trend to the abundance, being the highest in mid and late July, but also higher in the early sampling period.

Key words: Odontothrips loti, tolerance, alfalfa, assimilation product.