본 실험은 내충성품종을 선별하는 데 방사성동위원소인 P-32의 이용성을 검토하기 위해서 흰등멸구에 대해 기왕에 저항성 및 감수성으로 판정되어 있는 10개 품종을 선별하여 섭식량과 식이선호성간의 관계를 조사중 다음과 같은 결과를 얻었다. 1) 약충의 식이선호도와 P-32 섭식량간에는 밀접한 관계가 있었다. 2. 수칭유묘를 표식할 때는 근부와 엽의 길이 및 수를 일정하게 한 후 침적시키는 것이 P-32의 균일성을 인정할 수 있었다. 3. 내충성 검정시 공시충은 성충을 이용하는 것이 약충을 이용하는 것 보다 품종간에 상대적인 비교가 용이하였다.

In order to evaluate the technique of P-32 labelling method for screening lines of rice to whitebacked planthopper, the relationship between the amount of ingestion and feeding preference of insects were observed with the resistant and susceptible lines where characteristics were predetermined by comparing their feeding preference and antibiosis method. The feeding preference of the insects was significantly correlated with the amount of P-32 ingestion. It was more manifest in adults than nymphs of the whitebacked planthopper. The density of nymph and radioactivity of P-32 were high in the susceptible line. This suggested that deforming the ingestion amount of P-32 in the insects seemed to be useful technique for accurate screening. For this technique, the uniform labelling of P-32 on the rice seedings was prerequisite and the uniformity was increased by triming roots and leaves in the length and number.

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