• Korean journal of applied entomology
• /
• v.33 no.4
• /
• pp.225-229
• /
• 1994

The methanol extracts from 30 species of oriental medicinal plants belonging to 24 families were tested for their lhicidal and antifeeding activit~es against diamondback moth (Plutello xylostella L) and tobacco cutworn (Spodoptera litura F.) by a leaf-dipping method at a concentration of 5, 000 ppm. The methanol extract from Copti chinensis only showed a potent larvicidal activity against P xylostello. Strong antifeeding activity against P. xylostello was observed from the extmds from Platycodon grandiflorurn, Codonopsis pilosula, Asomm sieboldii, Rhus chinensis and Uthospermum erythrorhizon And a potent antifeeding activity against S. liturn was obtained from Akebia quinata and Equlsetum hyemale extracts. A significant antifeeding activity against both species was obtained from R chinensis and C. chinensis extracts.

• Journal of Sericultural and Entomological Science
• /
• v.34 no.2
• /
• pp.59-66
• /
• 1992

1-4령 저염인공사료 공동육＋5령 뽕잎육(농가개별육)$\longrightarrow$일주일 양잠에 적합한 광식성 누에품종육성에 필요한 기초지식을 얻기 위해 광식성유전자의 검색, 유전현상, 특성, 광식성계통 작출, 실용광식성 누에 품종육성방법 등에 대하여 소고하였다. 1. 광식성 유전자의 검색은 의잠을 사용하는 것이 가장 성력적이고 편리하며, 또한 섭식성을 정확히 파악할 수 있다. 2. 광식성 누에의 LP-1 사료에 대한 섭식성은 사육온도, 광조건, 발육단계 및 절식에 의하여 크게 영향 받지 않는다. 3. 광식성 유전자는 열성형질이며 1개의 주유전자와 수개의 수식유전자로 구성되어 있는 것으로 추찰된다. 4. LP-1 인공사료에 첨가한 morin 및 n-hexacosanol의 누에 섭식촉진효과는 미소하였으나, 상엽분말 첨가로 인한 누에 섭식촉진효과는 매우 양호하였다. 5. 광식성누에의 섭식성은 어분 및 효모에 의해 영향받지 않았다. 6. 섭식저해물질인 brucin 및 salicine은 정도의 차는 있으나 광식성누에의 섭식성을 저해하였다. 7. 광식성 및 비광광성누에의 LP-1 인공사료에 대한 섭식성의 차이는 누에의 두부에 있는 감각기관의 형태적 차이 때문이 아니라 기능적 차이에 기인하는 것으로 추찰된다. 8. 광식성 육성소재창출은 광식성유전자의 도입육종에 의해 가능하다. 9. 실용 광식성 누에품종육성을 위해 광식성검정에 적합한 인공사료를 사용하고, 실용형질이 우수하면서도 광식성유전자를 가진 계통을 선발, 교잡 또는 계통육성법에 의해 실용형질 및 섭식성을 개량하여 육종 목표를 달성하는 것이 최선책으로 생각된다.

• Korean journal of applied entomology
• /
• v.31 no.4
• /
• pp.475-479
• /
• 1992

The non-steroidal ecdysone agonist RH 5849 showed almost similar LC.o values( 18.1-26.5 ppm) at all stages of larval development of the tobacco cutworm, Spodoptera litura, when treated by a leaf-disk dipping method. The feeding-inhibition rate for the 4th instar larvae was dose-dependent, and simultaneously the weight gain of 3rd instar larvae ceased within 48 hour after feeding of the cabbage leafdisk dipped into RH 5849 4.2 ppm solution. The systemic larvicidal effect of RH 5849 was compared at cabbage and tobacco whole plant test. The $LC_{50}$ values below 20 ppm(mg/kg soil) was lasted for 15 days in cabbage, 30 days in tobacco respectively.

• Applied Biological Chemistry
• /
• v.37 no.6
• /
• pp.503-508
• /
• 1994

Methanol extracts from 45 species of oriental medicinal plants belonging to 17 families were subjected to a screening test for their larvicidal and antifeeding activities against two species of lepidopteran larvae, diamondback moth (Plutella xylostella L.) and tobacco cutworm (Spodoptera litura F.) by a leaf-dipping method. At a concentration of 8,000 ppm, methanol extract of Corydalis turrschaninovii roots only was found to have potent larvicidal activity against S. litura. At 5,000 ppm, strong antifeeding activity against both larvae was observed from the extracts of Clerodendron trichotomum, C. trichotomum var. esculentum, Inura helenium, Arctium lappa, Artemisia messerschmidtiana, Anthriscus sylvestris, Angelica dahurica, and C. turrschaninovii.

• Korean journal of applied entomology
• /
• v.54 no.2
• /
• pp.99-109
• /
• 2015

Insecticidal and antifeeding activities of 29 commercialized eco-friendly organic products for managing plant diseases and insect pests against Plutella xylostella larvae, Spodoptera exigua larvae, Frankliniella occidentalis adults, and Myzus persicae adults were tested using spraying and leaf dipping bioassays under laboratory conditions. Products containing 60% Sophora extract (EOIS) and mixtures (EOISm) with Sophora extract, Stemona japonica extract, Melia azedarach extract, and Nepeta cataria extract as well as mixtures (EOISc) with Sophora extract, Chenopodium ambrosioides extract, and Melia azedarach extract as active ingredients showed strong insecticidal activity at recommended concentration against P. xylostella larvae. At half concentration, their insecticidal activities were decreased under 50%. The EOIS gave good insecticidal activity against S. exigua larvae and also showed 85% and 95% insecticidal activity at 24 and 48 hours after treatment to F. occidentalis adults, respectively. For M. persicae adults, EOISm and mixtures (EOIR) containing rape seed extract, neem extract, and castar oil produced 93% and 68% insecticidal activity, but their activities did not be increased at double concentration. EOISm only showed 100% contact toxicity against M. persicae adults exposed to dipping leaves. Interestingly, the insecticidal activity of EOIR and EOICi (citronella oil and derris extract) against M. persicae adults was increased with exposed time and concentration. In addition, EOICe (cedar oil), EOIS, EOISm, EOISc, EOIM (microorganism), EOIR, EOIPe (plant extract), and EOIT (tea tree extract) gave strong antifeeding activity against S. exigua and P. xylostella larvae. EOIB, EOIBs, EOIM, EOICi, and EOIMc showed above 70% antifeeding activity to the lepidopteran larvae. These results indicate that mixtures containing 2 to 3 plant extracts with Sophora extract show good activities against insect pests, although the difference of insecticidal and antifeeding activities was produced depending on both a tested insect species and an active ingredient or concentration.

• Proceedings of the Korean Society of Applied Entomolohy Conference
• /
• 2000.10a
• /
• pp.31-31
• /
• 2000

• The Korean Journal of Pesticide Science
• /
• v.14 no.4
• /
• pp.394-400
• /
• 2010

Insecticidal activities of methanol extracts of the different parts of Prunus mume were investigated against the larvae of Cnaphalocrocis medinalis (C. medinalis) by topical application. The mortalities of the larvae of C. medinalis were 34% at the concentration of 4,000 ppm, 36% of 8,000 ppm, 40% of 16,000 ppm and 58% of 32,000 ppm of the extracts from the fruits, and 38% of 4,000 ppm, 45% of 8,000 ppm, 58% of 16,000 ppm and 75% of 32,000 ppm from the stem + flower of Prunus mume (P. mume), respectively. The rates of pupation of C. medinalis treated with either fruit or stem+flower were gradually low according to the concentration of extracts increased. The weight of pupae of C. medinalis has no significantly different in between the control and the treated groups of the extracts from both of fruit and stem+flower. However, the differences of the pupal weight and the rate of pupation of C. medinalis treated with the extracts from the stem+flower and fruit of P. mume were significant as the level of 56% ($R^2$=0.56363, P=0.4364). Both of stem+flower and fruit extracts of P. mume showed good effects of anti-feeding against C. medinalis. The extracts of the stem+flower of P. mume could be advocated for developing as birational agent for the control of C. medinalis.

• Proceedings of the Korean Society of Fisheries Technology Conference
• /
• 2000.05a
• /
• pp.359-360
• /
• 2000

해양 생태계에서 규조류는 요각류의 생산력에 필요한 중요한 먹이인 것으로 인식되고 있다. 그러나, 많은 실험실 연구에서 규조류가 요각류의 번식력을 억제할 수 있음을 보여주고 있다 (Ban et al., 1997; Poulet et at., 1994, 1995; Chaudron et al., 1996). 요각류 성체 암컷이 규조류를 섭식할 경우 요각류의 알 생산력이나 알 부화율이 낮아질 수 있으며, 이러한 저해 작용은 규조류가 아닌 다른 먹이 (와편모조류)로 대체하였을 경우, 정상적으로 회복될 수 있으며, 이러한 저해 작용은 먹이로 제공된 규조류의 밀도가 높을수록 더 강하게 나타나고 있었다. 이러한 증거들로 인하여 실제 해양에서 요각류의 번식력과 규조류 사이의 연결성에 대하여 의문이 제기되고 있다. (중략)

• Journal of Life Science
• /
• v.9 no.3
• /
• pp.248-252
• /
• 1999

Effects of the ultrasonic treatment on plant represents antifeeding activity and chitin synthesis inhibition activity against diamondback moth (Plutella xylostella L.) by a leaf-dipping method at a concentration of 5,000ppm. Methanol extracts of leaves of the ultrasonic treatment on plant was sequentially partitioned with n-hexane, chloroform, ethlyacetate, butanol and water fractions, and bioassayed. Antifeeding activities were observed in n-hexane, chloroform and ethlyacetate fractions. N-hexane fraction has 94.6% of strongest antifeeding activity against P. xylostella. From the n-hexane sequentially partitioned showed H6 and H8 fractions of antifeeding activities against P. xylostella. And chitin synthesis inhibition activity against P. xylostella was obtained the methaol, n-hexane and water fractions.

• Journal of the Korea Organic Resources Recycling Association
• /
• v.21 no.1
• /
• pp.85-93
• /
• 2013

The amount of salted food waste and non-salted food waste from household consisted of 4 family members was surveyed. And the feeding rate and growth rate of Eisenia fetida population upon the different food wastes such as vegetables, grains, fruits and salted food waste were investigated. Total amount of food waste from a household was 3,200g/week. i.e. 0.114kg/day/capita and non-salted food waste was 53.9% of food waste. Salt contents of vegetables, grains, fruits were 0.60, 0.36 and 0.33%, respectively, if they were assumed to have 70% water content. Salt content of salted food waste was 0.78%. Upon the non-salted vegetables and fruits, feeding rate of earthworm was high but growth rate was low. Upon the non-salted grains, feeding rate of earthworm was low but growth rate was high. Upon the food with 70% water content, earthworm could not feed and grow when salt content of food was over 0.6%, and earthworm could feed normally but showed low growth rate when salt content of food was 0.3%. These results indicated that earthworm could stabilize the non-salted food wastes with ease but could hardly stabilize the salted food wastes.