Effects of Temperature on Development of Oligota kashmirica benefica(Coleoptera: Sthphylinidae) and Its Seasonal Fluctuation in Yuzu Orchards

O1igota kashmirica benefica (딱정벌레목: 반날개과) 발육에 미치는 온도의 영향과 유자과원에서의 발생소장

  • 최덕수 (전남농업기술원 난지과수시험장) ;
  • 김규진 (전남대학교 농업생명과학대학 농생물학과) ;
  • 박종대 (전남농업기술원 식물환경연구과)
  • Published : 2002.09.01

Abstract

Population fluctuation of O. kashmirica benefica, a major natural enemy of citrus red mite (Panonychus citri), was surveyed from 1997 to 2000 in yuzu orchards in Goheung region and, developmental periods, developmental threshold temperature (DT) and effective cumulative temperature (ET) were estimated. Under four constant temperatures of 15, 20, 25 and 30$\^{C}$, developmental periods from egg to adult of the beetles were 67.3, 31.4, 19.4 and 15.3 days, respectively. The period of each stage was long in the order of pupa> egg > 3rd larva> 2nd larva> 1st larva. Mean numbers of eggs oviposited by a female per day were 3.3, 5.6, 7.3 and 7.7 under the temperatures, respectively. The highest hatchability (92%) and adult emergence (60%) were shown under 25$\^{C}$. Adult longevity was 54.3 days for females, and 58.6 days for males. In natural condition, the sex ratio of the beetle was 0.58. Developmental thresholds (DT) for egg, 1st, 2nd, 3rd larva, pupa, and egg to adult were 12.7, 10.0, 10.8, 7.9, 10.1 and 10.6$\^{C}$, respectively. The effective cumulative temperatures (ET) were 41.4, 22.9, 22.7, 46.6, 165.3, 292.9 day-degree at the same development stage, respectively. The beetle occurred from early April to early December in yuzu orchards. The population peak of the beetles was dependent on the amount of prey mite (Panonychus citri), and the ratio of the predator to prey mite was 1 to 100-200 at predator peak stage in the field.

Keywords

O1igota kashmirica benefica;Citrus junos;Panonychus cifri;O1igota kashmirica benefica;Seasonal fluctuation;Developmental period

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