Studies on Red Wood Ants (Formica sp.) for the Control of Pine Caterpillar (Dendrolimus spectabilis BUTLER)

불개미를 이용한 송충의 방제에 관한 연구

In order to use the red wood ants (Formica sp.) as a resources of natural enemy of pine caterpillar (Dendrolimus spectabilis Butler), the distribution of red wood ants in Gyeongnam Province, general ecology, and the limit of transplantation was investigated. The results obtained were summarized as follows: 1. Red wood ants preyed upon 1st to 3rd instar of pine caterpillar. 2. Red wood ants were distributed to 474 locations of 18 county, covering 7,702, $559m^2$ in Gyeongnam Province. 3. The distribution of red wood ants was $60\%$ in lower part, $39.5\%$ in middle part and $0.5\%$ in upper part of the mountain. 4. It seems that the height of building nest was directly proportional to the total number of each colony, showing the regression equation of Y=6,200 X-27,813, and the building nest was concerned with soil moisture. 5. It was possible to transplant the red wood ants from May to September, md 5 nests were built by the transplanted ants within one year.

불개미를 송충의 천적으로 이용하기 위하여 경남지방에 있어서 불개미의 분포, 일만 생태, 이식가능 한계기 등을 조사한 결과를 요약하면 다음과 같다. 1) 블게미는 1-3령기인 송충을 포식하였다. 2) 경남 지방의 불개미의 분포는 18개군 474개소에 분포하고 있으며 총면적은 $7,702,559m^2$였다. 3) 불개미 집의 분포는 하부에 $60\%$, 중부에 $39.5\%$ 및 상부에 $0.5\%$였다. 4) 조소의 높이와 군세는 정비례하며 회귀 방정식은 Y=6,200 X-27,813이였다 또한 조소와 수분과의 관계가 있음을 알 수 있었다. 5) 불개미의 이식 한계기는 5월-9월이었고 불개미를 이식한 바 1연간에 5개의 집을 만들었다.