To increase the fruit quality of the Japanese apricot, 3 species of insects, Apis mellifera, Bombus terrestris and Osmia cornifrons were used for pollination in Japanese apricot field in Jinju and Sancheong province. And also economical effect for crops of Japanese apricot fruit pollinated with same insect was analyzed. This study was also conducted using 3 kinds of methods for pollination effect, natural condition, net-house and control method. Because blooming period of Japanese apricot was different from the other fruit tree(Blooming time of Japanese apricot shows always in the middle of the March), foraging behavior of insects used in this examination showed different tendency each other. Especially O. cornifrons was not adapted to wind and lower temperature compared with A. mellifera and B. terrestris in this field condition. Rate of fruit set pollinated with A. mellifera and B. terrestris was showed 14.9% and 13% respectively. But O. cornifrons was lower than another 2 kinds of insects with 6% of fruit setting rate. Total rate of fruit set of Japanese apricot showed lower tendency compared with other kinds of fruit tree with under 30%. Quality of fruit pollinated with A. mellifera and B. terrestris showed higher than O. cornifrons in natural field condition in fruit weight. Economical income of Japanese apricot fruit producted by A. mellifera showed highest with 185% of benefit effect, and B. terrestris with 143% compared with natural field condition.

The current status of insect pollinator use was surveyed. Honeybee was larger than mason bee and bumblebee in average use area per farm household at kinds of insect pollinator. Insect pollinator was used at 19 crops. Among them, tomato was the most used crop, which was 44.9%, and in order to apple 26.7%, strawberry 13.1%, red-pepper 7.7% and watermelon 3.7%. In the use of insect pollinators, bumblebee, which was 56.9%, was higher than honeybee (31.3%) and mason bee (11.8%). The most farmers were a positive intention except for 1.5% of farmer in the use of insect pollinator for crop pollination. The best advantage in insect pollinator use was improvement of seed setting percentage, which was 28.3% and the worst problem was low activity at bad weather, which was 25.8%. And also, 97% of farmers have an intention to use continuously insect pollinator.

In order to select the superior lines of bumblebee queens(Bombus terrestris) in oviposition and colony development which has some characteristics of diapause with adult type, undiapaused bumblebee queens of 3rd generation were surveyed in room condition compared to queen treated with CO2 and artificial hibernation. Oviposition rate and preovipositional days of undiapaused queens was lower in efficacy with 46.7% and shows same trend in preovipositional days with 52.8 days than the other treatment with CO2 anesthesia and artificial hibernation with 60.0%, 86.7%, 26.1 days and 26.6 days respectively. In continuous experiment, we also surveyed ovipositional characteristic and colony development of three types of queens emergenced from undiapaused queens and treated queens with CO2 and artificial hibernation. Although undiapaused queens in 1st generation were more effective in the same condition than treated queens, but the undiapaused queens of 3rd generation emergenced from undiapaused queens of 2nd generation were very low trend in all checkpoints compared with treated queens in same generation. This results was shown that the queens treated with CO2 or artificial hibernation need to be in successive mass rearing continuously in the year round.