Korean Journal of Organic Agriculture (한국유기농업학회지)

Korean Association of Organic Agriculture (한국유기농업학회)
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Occurrence and Yield Characteristics of Lepidopteran Insect Pests in Green Maizes and Sorghum Crops between Paddy-upland Rotation and Continuing Upland Fields

유기농 풋옥수수와 수수의 답전윤환밭과 연속밭에서 나방류 해충들의 발생 및 수량 특성

  • 조형찬 (우석대학교 재활학과) ;
  • 김민준 ((주)나리소 기능성연구소) ;
  • 윤성탁 (단국대학교 농업생명자원대학) ;
  • 이희권 (고창군 농업기술센터) ;
  • 김순일 ((주)나리소 기능성연구소)
  • Received : 2018.03.29
  • Accepted : 2018.08.06
  • Published : 2018.08.31
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Abstract

Occurrence and yield characteristics of lepidopteran insect pests in both PUR (paddy-upland rotation) and CU (continuing upland) fields for 8 maize (Eolrukchal 1, Heugjeom 2, Miheukchal, Ilmichal, Heukjinjuchal, Chalok 4, Mibaek 2, Daehakchal) and 7 sorghum (Hwanggeumchal, Anzunbaengisusu, Moktaksusu, Sodamchal, DS-202, Nampungchal, Donganme) varieties was surveyed. The population of Ostrinia furnacalis adults showed 3 times highest peaks in 2016. In addition, the damaged ratios of maize and sorghum leaves and stems were increased depending on the growth periods of the crops and those by O. furnacalis larvae were also increased steeply in mid August. The damaged ratios of maizes such as Miheukchal, Eolrukchal 1, Ilmichal, Heugjeom 2, and Mibaek 2 by O. furnacalis larvae were statistically different (P=0.05) between organically managed PUR and CU fields. Except for DS202 among sorghum varieties, the damaged ratios of the other ones were high and similar (50-92%) in the CU field. The ear damaged ratio of maize varieties by lepidopteran larvae including O. furnacalis and Helicoverpa armigera was from 5 to 38% in Chalok 4 and Heukjinjuchal, respectively, and Daehakchal gave relatively higher damage ratio in the PUR field (33%) than in the CU field (14%). The ear ratio of Sodamchal and DS-202 varieties in the PUR field was 94 and 82%, and all sorghum varieties were damaged over 78% by lepidopteran larvae in the CU field. Interestingly, the correlation coefficients between the damaged ratio and invasive pores on their stems by O. furnacalis larvae were positive (maize $r=0.69_{paddy-upland}$, $0.95_{continuing}$; sorghum $r=0.93_{paddy-upland}$, $0.97_{continuing}$, respectively). Additionally, the correlation coefficients between the damaged ratio and the ear weight or the thousand kernel weight (g) of maizes and sorghums by lepidopteran larvae were negative (maize $r=-0.38_{paddy-upland}$, $-0.49_{continuing}$; sorghum $r=-0.70_{paddy-upland}$, $-0.57_{continuing}$, respectively). These results indicate that the focused management on lepidopteran insect pests occurring maizes and sorghums cultivated in PUR and CU fields is an important strategy to secure their yields.

유기농 답전윤환밭 및 연속밭의 옥수수 8품종(얼룩찰1호, 흑점2호, 일미찰, 흑진주찰, 찰옥4호, 미백2호, 대학찰)과 수수 7품종(황금찰, 앉은뱅이수수, 목탁수수, 소담찰, DS202, 남풍찰, 동안메)에서 나방류 발생 및 수량 특성을 조사하였다. 조명나방 성충은 년 3회 최성기를 보였고 담배나방류 성충들은 3-4회 최성기를 보였다. 또한 조명나방 유충에 의한 옥수수 및 수수의 잎과 줄기 피해율은 시간이 지날수록 증가하는 경향을 보였는데, 수수의 조명나방 유충에 의한 피해율은 8월 중순에 급격히 증가하였다. 미흑찰, 얼룩찰1호, 일미찰, 흑점2호, 미백2호 등 옥수수 품종들에 대한 조명나방 유충에 의한 피해율은 윤환밭과 연속밭 간 통계적으로 유의한 차이(P=0.05)를 보였고, DS202 품종(83%와 89%)을 제외한 나머지 6종 수수 품종들의 조명나방 유충에 의한 피해율은 연속밭에서 높거나 비슷하였다(50-92%). 옥수수의 나방 유충에 의한 이삭 피해율은 5%(찰옥4호)에서 38%(흑진주찰)였는데, 대학찰 품종은 답전윤환밭(33%)에서 연속밭(14%)에 비해 상대적으로 더 높은 피해를 입었다. 답전윤환 수수 포장에서 소담찰(94%)과 DS202(82%)가 높은 피해율을 보였고, 연속밭에서는 7개 수수 품종 모두 78% 이상의 피해율을 보였다. 흥미롭게도 답전윤환밭 및 연속밭의 옥수수와 수수 품종들에 대한 조명나방 유충에 의한 평균 피해율과 평균 침입공수 간에는 각 정의 상관관계(옥수수 r=0.69윤환밭, 0.95연속밭; 수수 r=0.93윤환밭, 0.97연속밭)를 보였다. 또한 수확 후, 유기농 윤환밭 및 연속밭 포장에서 나방 유충에 의한 옥수수 8품종들과 수수 7품종들의 평균 피해율과 이삭무게 또는 천립중(g) 간에 부의 상관관계(옥수수 r=-0.38윤환밭, -0.49연속밭; 수수 r=-0.70윤환밭, -0.57연속밭)를 나타냈다. 이상의 결과는 유기농 옥수수 및 수수 재배포장에서 나방류의 관리가 수량 확보에 매우 중요하다는 사실을 의미한다.

Keywords

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