• Korean journal of applied entomology
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• v.47 no.1
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• pp.37-44
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• 2008

Oriental fruit moth, Grapholita molesta, is a serious pest on apples. To control this pest in an environmentally friendly method, mating disruption strategy using sex pheromone has been developed. Area-wide application of mating disruption has been needed to be effective, with little understanding on how much size of apple cultivating area should be treated in one time application of the mating disruption technique. On this matter, we needed to determine a minimal mating active zone of G. molesta that should be applied with mating disrupters to be effective. Molecular markers to discriminate a specific population should be developed to trace population migration for reproductive behaviors. Here we developed two effective molecular markers using random amplified polymorphic DNA (RAPD) technique. Different field populations of G. molesta, based on locations and seasons, were analyzed with these markers. In a specific location, G. molesta populations varied in genetic composition with different seasons. Different local populations showed differential variation according to their relative distances among apple orchards. In overall, genetic variation among different populations became lessen with progression of seasons.

• Korean journal of applied entomology
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• v.51 no.3
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• pp.223-230
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• 2012

Some high frequency sounds alter physiological processes of the beet armyworm, Spodoptera exigua. This study investigated the effect of ultrasound (${\geq}$ 20 kHz) on larval feeding, pupal development, and adult mating behavior of S. exigua. Ultrasound suppressed feeding behavior of fifth instar larvae, and 30 or 45 kHz treatment inhibited more than 50% of feeding activity. Larvae treated with ultrasound exhibited alterations in major nutrient compositions in the hemolymph plasma. Plasma protein levels decreased with an increase in ultrasound frequency. In contrast, sugar levels increased with an increase in ultrasound frequency. Lipid levels increased with an increase in ultrasound frequency up to 30 kHz and then decreased at treatments > 30 kHz. Hemocytes, the fat body, and epidermis expressed three heat shock proteins and apolipophorin III. Ultrasound treatment markedly inhibited expression of some stress-related genes. Ultrasound treatment also inhibited S. exigua pupal development by extending the pupal developmental period and preventing adult emergence. Last, ultrasound treatment significantly inhibited adult mating behavior, which resulted in a significant decrease in female fecundity. These results show that ultrasound is a physiological stress to S. exigua.

• Korean journal of applied entomology
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• v.33 no.2
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• pp.66-73
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• 1994

Adult emergence period, the calling behavior pattern and the mating ability of female depending on ages, 9day old male's response to sex pheromone released from each 1- to 5-day old female, and the structure and location of sex pheromone gland were obse~edin Ostrinia furnacalis. Adults usually emerged from 1 hour before to 1-2 hours after the beg~nning of scatophase under the 16L/8D photoperiod. And most active calling behavior was obserued for two hours from the 5th to 7th hours of scotophase among 2- and 3-day old females, and 3-day old male' response to 3-day old females was higher than to any other age of females during the 5th-8th hours of scotophase. Mating frequency was higher at the 4th-7th hours after the beginning of scotophase. Among 1. to Cday old females extruding sex pheromone gland, more than 65% of them successfully mated with 2- to 4-day old males. And, 2- or 3-day old females exhuding sex pheromone gland showed an abdiw. over 60%, to mate with each 1--5-day old males. Hypertrophied cell layers, presumed to be a sex pheromone gland of female adults, were located at two intersegmental membranes between the 8th & 9th, and the 9th & 10th abdominal segments.

• Nuclear industry
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• v.5 no.9 s.31
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• pp.47-48
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• 1985

최근 일본은 남서부지방의 과실류 등에 기생하는 것이 확인된 과실파리에 대한 방제법으로 방사선을 이용한 ${\ulcorner}$불임충방사법${\lrcorner}$의 실시를 검토중이라고 한다. 이 방법은 Co-60에 의한 감마선으로 불임화한 숫놈의 성충을 풀어 야생의 암컷과 교미시킴으로서 방제하는 것인데, 우리나라도 소나무의 솔잎혹파리근절이 산림정책의 중요한 과제의 하나인 바, 관심거리가 아닐 수 없다.

• Proceedings of the Korean Society of Applied Entomolohy Conference
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• 2004.05a
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• pp.128-128
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• 2004

• Monthly Duck's Village
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• s.56
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• pp.54-56
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• 2008

오리 종란을 수집하기 위해서 이용하는 가장 보편적인 사육 방법은 암.수를 일정한 비율로 합사하는 것으로 자연교미를 이용하는 것이다. 그러나 우수한 종오리나 특정 합성종오리(종간 혹은 속간 잡종)를 생산하기 위해서는 인위적인 인공수정기술을 이용하여 계획교배를 하여야 하며, 이를 위해서 선발된 오리들은 케이지 사육을 하여야 한다. 오리 인공수정기술이 닭의 인공수정기술과는 숫오리의 정액 채취기술에서만 차이가 있고 다른 부분에서는 매우 유사하므로 정액채취부분을 중심으로 설명을 하고자 한다.

• Proceedings of the Korean Society of Environment and Ecology Conference
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• 2009.10a
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• pp.185-188
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• 2009

• Proceedings of the Korean Society of Applied Entomolohy Conference
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• 2005.05a
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• pp.201-201
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• 2005

• Proceedings of the Korean Society of Applied Entomolohy Conference
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• 2003.10a
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• pp.143-143
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• 2003

• Korean Journal of Ichthyology
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• v.17 no.4
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• pp.229-235
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• 2005

Sexual maturity of Korean skate, Raja koreana, was investigated based on 89 specimens caught between September 2002 and December 2003 in the southwestern sea of Korea. Clasper development was slow between 35 cm and 52.5 cm TL, increased abruptly between 59.5 cm and 71 cm TL, and thereafter decreased, showing an overall sigmoidal growth pattern. Unlike other skates and sharks, Korean skate males were already histologically mature before the claspers lengthened. Although the egg capsules were found in May and November in Korean skate females, histological findings indicated that spawning occurred throughout the year except summer in females but all the time in males.