방사선을 투사한 이화명나방의 교미능력 및 경쟁력 조사를 5-7령 번데기에 gamma선을 투사하여 조사하였다. 얻어진 결과는 다음과 같다. 1. 방사선 처리웅충과, 정상적인 수컷에 매일 새로운 미교미자충을 넣어 주었을 때 그들간에 교미 최고회수에는 유의차가 없었다. 2. 교미초일은 정상웅충의 경우 평소 1.5일이며 25.30Krad 처리웅충은 2.4일이었다. 교미 일 간격은 정상웅충이 1.3일인데 대하여 처리웅충은 3.0일이었으며 방사선 투사는 교미력에 영향이 있었다. 3. 정상웅충 1두에 정상자충 5두와 10두씩을 넣어서 정상웅충의 평균교미회수를 조사한 겨로가 1.2회와 2.5회이었다. 4. 교미경쟁력 실험에서 미교미자충 5두에 대하여 방사선 투사 웅충과 정상웅충의 비율을 1:0, 1:1, 2:1, 1:2, 5:1, 1:5, 0:1로 하였을 때 난부화 감소율은 5:1(30Krad)에서 최대의 감소를 보였으며 이때의 난부화율은 $26.6\%$이었다. 5. 방사선 투사는 교미능력에 다소의 영향을 미치나 처리웅충에 의한 산란수 감소의 영향을 고려한다면 이화명충에서 웅성불임 기술의 이용은 가능할 것으로 생각된다.
Five to seven day old pupae were irradiated with gamma rays, the mating ability, and competability of the irradiated males were examined. The results obtained are summarized as follows: 1. There is no difference in percentage of males that mated, nor in the maximum number of matings of the males, when individual matings were made, and fresh females were provided every day for his life time. 2. The average days for the first mating of the emerged were 1.5 days for the control, and 2.4 days for the males irradiated with 25 and 30 Krad. The average days between first and second mating were 3.0 days for the irradiated males, and 1.3 days for the control. 3. The average matings of a male were 1.2 and 2.5 times when 5 and 10 females were provided to a normal male respectively. No significant different in average numbers of mated female per male were observed between the normal and irradiated males. 4. To test the mating competitiveness of the irradiated and normal males (1:0, 1:1, 2:1, 1:2, 5:1, 1:5, 0:1) were confined together with five virgin females. The greatest reduction in hatching percentage was found with 5 : 1 : 1 (30 Krad) where $26.6\%$ was hatched.5, The results showed that the irradiated males were not fully competitive with normal males, but if the reduced number of eggs produced by the female mated with irradiated male is considered, it might be used sterile male techniques in rice stem borer control.
