• Title/Summary/Keyword: Chestnut weevil

Search Result 5, Processing Time 0.017 seconds

Effects of Immersion Temperatures and Times on Chestnut Fruit and Mortality of the Chestnut Weevil, Curculio sikkimensis Heller (밤바구미 방제를 위한 온도 및 시간별 침지처리 효과와 종실 변화)

  • Kim, Young-Jae;Kim, Hyun Kyung;Lee, Ka-Soon;Kim, Gil-Hah
    • Korean journal of applied entomology
    • /
    • v.53 no.4
    • /
    • pp.339-346
    • /
    • 2014
  • To control populations of the chestnut weevil, Curculio sikkimensis Heller, the effects of various immersion temperatures and times on the chestnut weevil were tested. The effects of immersion treatments on chestnut fruits were also analyzed. The mortality levels of C. sikkimensis larvae were evaluated at various temperatures ($30^{\circ}C$, $35^{\circ}C$, $40^{\circ}C$, $45^{\circ}C$, and $50^{\circ}C$) and time intervals (1, 2, 3, 5, 7, 10, 15, 22, and 24 h). Changes in the chestnut fruit due to the immersion treatment were measured in terms of color (lightness, redness, and yellowness), physiological effects (germination rate and decay rate), hardness, and change in constituent properties (moisture content, free sugar content, and tannin content). Mortality levels of C. sikkimensis larvae after immersion treatment at $30^{\circ}C$ were over 70% and 100% after 2 h and 7 h, respectively. Color (lightness, redness, and yellowness) of the chestnut fruits was not significantly different at $30^{\circ}C$ and $35^{\circ}C;$ however, the color was affected at temperatures over $40^{\circ}C$. The germination rate of the fruit was not affected by the immersion treatments, but the decay rate at $40^{\circ}C$ increased with an increase in immersion time. The hardness of the fruits decreased with an increase in immersion times and temperatures. These results can be used in the future for developing methods for the control of chestnut weevil populations.

Seasonal Occurrence of the Larvae and Adults of Chestnut Weevil, Curculio sikkimensis (Coleoptera: Curculionidae) (밤바구미(Curculio sikkimensis) 유충과 성충의 발생소장)

  • Kim, Young-Jae;Yoon, Chang-Mann;Shin, Sang-Chul;Choi, Kwang-Sik;Kim, Gil-Hah
    • Korean journal of applied entomology
    • /
    • v.47 no.1
    • /
    • pp.9-15
    • /
    • 2008
  • This study was conducted to investigate the seasonal occurrence of chestnut weevil, Curculio sikkimensis. The chestnuts infected by the weevils were collected from Gongju, Buyeo, and Cheongyang in Chungnam Province, Republic of Korea. Investigation was focus on the escape period of chestnut weevil larvae from the fruits, invading time and vertical distribution in soil, survival rates of larvae during overwintering, emergence period, emergence rate, and sex ratio and longevity of adults. For precocious species, larvae escaped the chestnut from the mid-September to the early-October, middle species and slow species, were escaped from the late-September to the mid-October and from the early-October to the mid-November. After escaping from the chestnut fruits all of the larvae burrowed into the soil within 35 minutes. Overwintering larvae inhabited in the range of $0{\sim}48cm$ from the soil surface and highly distributed in the range of $18{\sim}36cm$. The 74.1 % of wintering chamber were distributed within $18{\sim}36cm$ from the surface. Survival rates observed were 38.0% in 1st year, 16.0% in 2nd years, and 2% in 3rd years, respectively. Seasonal occurrence period of C. sikkimensis was from the early-Aug. to early-Oct. and the optimal occurrence period was the early and mid-Sept. Emergence rate decreased to 8.4% in 1st year, 3.6% in 2nd years, and 0.8% in 3rd years, respectively. Sex ratio was showed in the range of 0.51-0.55. It is female biased ratio. Longevity of adults was 9.9 days for female and 8.9 days for male.

Measurement and Comparison of Morphology of Developmental Stages of Chestnut Weevil, Curculio sikkimensis(Coleoptera: Curculionidae) (밤바구미 (Curculio sikkimensis)의 발육단계별 형태측정 및 비교)

  • Kim, Young-Jae;Moon, Sang-Rae;Yoon, Chang-Mann;Kim, Gil-Hah
    • Korean journal of applied entomology
    • /
    • v.49 no.1
    • /
    • pp.11-16
    • /
    • 2010
  • Measurements were made on morphology of each developmental stages of the chestnut weevil, Curculio sikkimensis, reared in the laboratory and field from 2003 to 2006. The size of egg was 0.8${\pm}$0.03 mm. The escaping larvae were measured, in average, as 98 mg in body weight, 10.65 and 3.99 mm in body length and width, and 1.70 mm in head width. Pupal size of female and male was 7.01 and 6.53 mm, respectively. The fresh weight (0.343 g), body length (7.76 mm) and width (3.38 mm), and head width (1.60 mm) of female adults were significantly bigger than those (0.268 g, 7.14 mm, 3.01 mm and 1.37 mm, respectively) of male adults. Proboscis length (6.53 mm) and antennal length (5.47 mm) of female was also significantly longer than those (3.56 and 4.63 mm, respectively) of male. The larvae of C. sikkimensis overwintered for 1~3 years and their body weight, body length, and body width were decreased. The ratio between proboscis length and body length, the basipodite position attached to the proboscis, and shape of the sex organ on the abdominal end could be used to discriminate sexes.

Recognition and Using Status of Carbon Disulfide (CS2) as Fumigant for Controlling Chestnut Weevil, Curculio sikkimensis among Chestnut Farmers (일부 밤 농사 및 가공 종사자의 밤바구미 훈증제 이황화탄소 사용실태 및 인식)

  • Lee, Moo-Sik;Kim, Eun-Young;Lee, Jae-Lim;Sohn, Gi-Yeon
    • Journal of agricultural medicine and community health
    • /
    • v.41 no.2
    • /
    • pp.63-74
    • /
    • 2016
  • Objectives: We surveyed the awareness and current status of using fumigant carbon disulfide for exterminate Curculio sikkimensis among chestnut farmers in Chungnam Province to suggest directions for health education and public relations. Methods: We designed questionnaires to evaluate recognition of fumigant carbon disulfide. We conducted a questionnaire survey to assess recognition and recognition level of fumigant carbon disulfide by the study variables. Results: The recognition status for fumigant carbon disulfide was 74.5%, but the recognition level was low (know well 27.5%). The path of recognition was 45.1% and 15.7% for neighbor and rural technology center, respectively. The recognition status for warning label of fumigant carbon disulfide was 52.9%. Recognition for warning label of fumigant carbon disulfide was tended to increase with high educational attainment, bigger owning land area. Recognition on the content of warning label were 29.4%, 27.5%, 21.6%, and 21.6% for inflammability, toxicity, hazard, and explosiveness, respectively. Using personal protection equipment was tended to increase with the high status of awareness on fumigant carbon disulfide. Conclusions: Health education programs for using fumigant carbon disulfide are needed for chestnut farmers. In addition, publicity information activities about prevention and protection of carbon disulfide poisoning are needed for high risk farmers.

concentration of cyclic AMP and activity of cyclic AMP-dependent Protein Kinase in Chestnut Weevil, Curculio dentipes (밤바구미(Curculiodentipes) 유충의 cyclic AMP 농도와 CAMP-dependent protein kinase 활성도 변화)

  • 류진수;김유경이경로
    • The Korean Journal of Zoology
    • /
    • v.37 no.2
    • /
    • pp.222-231
    • /
    • 1994
  • 밤바구미 유충기의 whole body로부터 cyclic AMP(CAMP)를 추출하여 농도 변화를 측정하였고 cyclic AMP-dependent protein kinase(PKA)를 부분 정제하여 활성도 변화를 조사하여 CAMP 농도와 PKA 활성도와의 소장관계를 비교하였다 CAMP 농도와 PKA 활성도는 HPLC와 liquid scintillation counter를 이용하여 측정하였다 CAMP 농도는 밤바구미 유충에서 월동전에 0.57 UMlg로 가장 높았고, 월동중에 0. 14 UMIS로 감소하였다가 월동후에 0.29 UMlg로 증가하였다 또한 PKA 활성도는 월동전에 2.56unit/mg로 가장 높았으며, 월동중에 0.62 unit/mg로 감소하다가 월동후에 07 unit/mg로 다시 증가하여 CAMP 농도 변화와 유사한 경향을 나타내었다. 이는 월동전에 휴면에 대비하여 최대의 취식으로 지방체 축적이 가장 많았고, 월동중에는 지방체의 소비가 증대되.기 때문에 감소하였다가, 월동후 휴면 종결과 유충-번데기 탈피를 준비하기 위해 'CAMP 농도와 PKA 활성도는 다시 증가하였다.

  • PDF