이화명나방 유충의 식이선호성에 있어서 수도품종간 차이

Varietal Differences in Feeding Preference of the Striped Rice Borer Larvae (Chilo suppressalis W.)

이화병나방 유충의 식이선택성에 있어서 수도품종간 차이를 시험하여 아래와 같은 결과를 얻었다. (1) 품종에 따라 유충의 식이선택성에 현저한 차이가 있었으며 수도의 생육기에 따라 식이선택성에 변화가 있었는데 생육초기에 비하여 후기에 높아지는 것(Rexoro, Suweon 240, Suweon 213-1, Yushin 및 Jinheung), 초기에 비하여 후기에 낮아지는 것(Tetep, Suweon 242) 및 생육기에 따라 변화가 없는 것(TKM-6, IR-26)이 있었다. (2) 감수성 대조품종 Rexoro는 저항성 대조품종 TKM-6에 비하여 식이선택성이 언제나 높았다. Tongil(Suweon 213-1)은 Rexoro와 Jinheung에 비하여 유충의 식이선택성이 현저히 낮았고 TKM-6와 거의 대등한 정도의 식이선택성을 타나내었다. (3) 이화명충에 대한 수도의 저항성과 식이선택성과는 밀접한 관계가 있는 것 같다.

A laboratory experiment was conducted to investigate varietal differences in feeding preference of striped rice borer larvae (Chilo suppressalis W.) to the stem pieces of the eight rice varieties. The preference of the larvae for feeding was significantly differed with the varieties, and in some varieties they were changed with the stages of the plants after transplanting. The larvae much more preferred the susceptible variety Rexoro than the resistant variety TKM-6. The varieties Tongil (Suweon 213-1), Yushin, Jinheung and IR-26 showed comparatively lower feeding preference than TKM-6. Some varieties exhibited a rather interesting phenomenon; strong preference in feeding was observed during the vegetative phase for Tetep and Tongil (Suweon 213-1) and during the maturing phase for Suweon 240 and Yushin. When the varieties TKM-6, Tongil and Rexore were given in several combinations, Rexore was strongly preferred by the larvae than others, and Tongil was still comparatively low in feeding preference of the larvae. The non-feeding preference of the larvae were considered to be in coincidence with the resistance of rice varieties to the striped rice borer.