An aspect of quarantine insect pest occurrence with different management system in sweet persimmon orchard

단감원의 방제 체계에 따른 검역대상 해충 발생 양상

  • Lee, Dong-Woon (Institute of Agricultural Science, Sangju National University) ;
  • Park, Jae-Wan (Department of Sericulture and Insect Resources, Sangju National University) ;
  • Park, Chung-Gyoo (Division of Plant Resources and Environment, College of Agriculture, Gyeongsang National University) ;
  • Choo, Ho-Yul (Division of Applied Life Science, Gyeongsang National University) ;
  • Kim, Young-Sub (Department of Sericulture and Insect Resources, Sangju National University)
  • 이동운 (상주대학교 농업과학연구소) ;
  • 박재완 (상주대학교 잠사곤충자원학과) ;
  • 박정규 (경상대학교 농과대학 식물자원환경학부) ;
  • 추호렬 (경상대학교 응용생명과학부) ;
  • 김영섭 (상주대학교 잠사곤충자원학과)
  • Published : 2003.09.30

Abstract

Temporary control schedules were tested at sweet persimmon orchards to development new control programs to meet the quarantine repuirements of America in 2001 and 2002. The 'MRL-type control orchards' were sprayed with chemicals which were possibly adaptable to the pome trees in America. A control schedule consisted of those chemicals registered for persimmon in Korea was incorporated in the 'domestic-type control orchards'. The efficacy of these two control type against insect pests was compared with that of a conventional control schedule. In 2001, MRL orchard and domestic orchard were sprayed 7 and 6 times, and two conventional orchards were 6 and 9 times, respectively. In 2002, acaricide was added once to the MRL orchards at late September to reduce the density of mites on harvested fruits. However no insecticide to plant bug control could be applied to the MRL orchards, because no insecticide against bugs was registered for pome trees in America. This resulted in 7 times of applications in MRL and domestic orchards. The conventional orchard was sprayed 9 times. Only the occurrence of the peach pyralid moth, Dichocrocis puntiferalis (PPM) out of 4 quarantine inset species was observed. The PPM was observed during growing season in MRL, domestic, and conventional orchards. However no fruits damaged by PPM larvae were observed after mid October and after harvest. In 2002 only 1 fruit out of 1,350 fruits inspected in June was damaged by the larvae of PPM at MRL orchards. A fungus-feeding mites and collembolan were under calyx of vested fruits. In 2001 they were found on 45.3% of harvested fruits at MRL orchard. However the percentage of fruits with mites in 2002 was greatly reduced to 3.5% at MRL orchard, presumably because of a added application of acaricide at late September. However percentage of fruits damage by hemipteran bugs at harvesting time was quite high 11.3 % at MRL orchards, because no application of insecticide against plant bugs.

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