Differential Tolerance of Pepper Cultivars to Bentazon

Bentazon에 대한 고추품종간 내성 차이

Greenhouse studies were conducted to evaluate the tolerance of 42 pepper cultivars to postemergence applications of bentazon [3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide]. Cultivars, Jopoong, Singsing House, Sweet Green, Kwangbok, and Ilcheon showed relatively tolerant response to bentazon, while cultivars, Dahhong, Early Glory, Korea, Cheongyang, Nostalgia, and Daejanggyeong were susceptible ones to it. At rates over 2.40 kg ai/ha, the tolerant cultivars appeared to be clearly or more tolerant than the susceptible cultivars. For the determination of growth inhibition by bentazon, the concentration required to reduce growth by 50% (GR_(50)) was 2.00 to 2.40 kg ai/ha for susceptible cultivars, and 10.00 to 12.00 kg ai/ha for tolerant cultivars. Moreover, the herbicide rate required to inhibit growth by 50% $(I_{50})$ was 2.40 kg ai/ha for susceptible cultivars and 9.60 kg ai/ha for tolerant cultivars, respectively. On the $I_{50}$ and $GR_{50}$ estimates of growth, the tolerant cultivars were 5- to 6-fold more tolerant to bentazon than susceptible ones.

Bentazon에 대한 품종간 내성을 검정하기 위하여 온실에서 42 고추품종을 30일간 재배한 다음 Bentazon을 경엽처리하여 내성품종과 감수성품종을 선발하였다. 조풍, 종가집, 싱싱하우스, 녹광, 광복 및 일천 품종은 비교적 내성을, 대홍, 조광, 고려, 청양, 향촌 및 대장경 품종은 감수성을 나타냈다. 내성품종은 Bentazon 3.4 kg/ha 이상 수준에서도 감수성품종에 비하여 현저한 내성을 보였다. 고추생장은 50% 저해하는 Bentazon 농도$(I_{50})$는 감수성품종은 2.0~2.4 kg/ha, 내성품종은 10.0~12.0 kg/ha이며 또한 50% 생장을 감소시키는 Bentazon 농도 $(GR_{50})$는 감수성품종은 2.4 kg/ha이고 내성품종은 9.6 kg/ha이었다. 따라서 내성품종은 감수성 품종보다 5~6배 내성을 나타내었다.