• Proceedings of the Korean Society of Applied Entomolohy Conference
• /
• 2002.05a
• /
• pp.80-80
• /
• 2002

• Proceedings of the Korean Statistical Society Conference
• /
• 2003.05a
• /
• pp.69-74
• /
• 2003

The estimation of pest density is a prime concern of Integrated Pest Management (IPM) because the success of artificial intervention such as spraying pestcides or natural enemies depends on pest density. Also, the spatial pattern of pest population within plants or plots has been studies in various ways. In this study, we applied generalized linear mixed model to Tetranychus urticae Koch , two-spotted spider mite count in glasshouse grown roses. For this analysis, the subject-specific as well as pupulation-averaged approaches are used.

• Proceedings of the Korean Society of Applied Entomolohy Conference
• /
• 2005.05a
• /
• pp.187-187
• /
• 2005

• Applied Biological Chemistry
• /
• v.37 no.6
• /
• pp.492-497
• /
• 1994

Extracts of 43 species of plants were tested for their insecticidal and acaricidal activities against six species of insect pests and one mite species. The methanol extract of Ginkgo biloba leaves selectively was found to have potent insecticidal activity against Nilaparvata lugens (Stal), whereas steam distillate of Thujopsis dolabarata var. hondai sawdust showed potent insecticidal activities with a broad spectrum. The methanol extract of Pinus densiflora leaves and steam distillate of T. dolabrata var. hondai sawdust exhibited potent activities against Tetranychus urticae (Koch).

• The Korean Journal of Pesticide Science
• /
• v.12 no.3
• /
• pp.243-248
• /
• 2008

The present research was conducted to determine insecticidal activity of methanol extract and its fractions from the fig (Ficus carica L.) leaves grown under different cropping conditions, glasshouse, plastic house, and outdoor. Methanol extracts from fig loaves grown at outdoor showed higher insecticidal activity (80 to 89%) against Tetranychus urticae than those at plastic house or glass house. Especially ethylacetate and hexane fractions from methanol extracts of fig leaves grown at outdoor exhibited the highest insecticidal activity against Tetranychus urticae, showing 92% and 90% control, respectively. The results suggest that methanol extract and its fractions from outdoor-grown fig leaves had the potent insecticidal activity as a plant-based insect control mean.

• The Korean Journal of Pesticide Science
• /
• v.14 no.3
• /
• pp.266-271
• /
• 2010

Six insecticides, monocrotophos (24%, Lq), milbemectin (1%, Ec), tebufenpyrad (10%, Ec), propargite (30%, Wp), dicofol (42%, Ec), and fenpropathrin (5%, Ec) were studied for their $LC_{50}s$ to local two-spotted spider mite (TSSM) strains collected at apple orchards in Chungju, Kunwi and Sobo in Korea. Monocrotophos and fenpropathrin were not effective due to resistance development, but milbemectin, tebufenpyrad, dicofol and propargite were effective to TSSM. $LC_{50}$ values to TSSM strains showed the same distribution pattern among apple orchards. However, TSSMs from different apple orchard were clustered into different groups.

• Korean journal of applied entomology
• /
• v.34 no.3
• /
• pp.200-205
• /
• 1995

Total 31 samples from 21 African plant species in 13 families were tested for their insecticidal and acaricidal activities against Nilaparvata lugens (Stal) and Tetranychus urticae (Koch) adults through topical application an leaf-dipping methods, respectively. The insecticidal and acaricidal activities were both plant parts and species dependent. The methanol extracts from whole plants of Casia occidental is and Cassia tora (Caesalpinaceae), an stem of Prosopis chinensis (Mimosaceae) revealed potent insecticidal activity against N. lugens. Potnet acaricidal activity against T. urticae was obtained from the methanol extracts from whole plants of Celosia trigyna (Amaranthaceae) and Combretum micronthum (Combretaceeae), leaves of Combretm glutinotum, and leaves and fruits of prosopis chinensis.

• Korean journal of applied entomology
• /
• v.32 no.2
• /
• pp.123-128
• /
• 1993

The comparative toxicities of selected acaricides against the twospotted spider mite, Tetranychus urticae, were investigated. The ovicidal and adulticidal activities of selected acaricides were examined under different developmental stages. Fenpyroximate showed high activity throughout all developmental stages of mites. The oviposition inhibition effect of fenpyroximate was more highly effective than that of cyhexatin. At 100 ppm concentration, the effect of fenpyroximate on the residual oviposition inhibition was persistant during 25 days with 85% level, while the effect of cyhexatin gradually decreased, and then decreased to 40% at 25 days after treatment. Fenpyroximate at 100 ppm showed 100% knockdown activity within 3 hour while cyhexatin showed only 91% knockdown activity within 24 hours after treatment. Most of selected acaricides had no systemic activity, but metasystox at 800 ppm had 100% of the systemic activity at 24 hours after treatment. For the influence of temperature on the activity, fenpyroximate showed stable activity and no temperature-dependent in comparison with other selected adaricides.

• Korean journal of applied entomology
• /
• v.55 no.4
• /
• pp.431-437
• /
• 2016

This study was carried out to investigate pests and their damage caused to commercial greenhouse strawberries in Jeju from 2013 to 2016. A total of 8 orders, including 31 species, of pests were found. Among them, the major pests were Tetranychus urticae, Frankliniella occidentalis, and Aphis gossypii. Although Trialeurodes packardi and Empoasca vitis were sometimes severely damaged strawberries, their frequency of occurrence and damage caused increased gradually. Of lepidopteran pests, Spodoptera litura showed the highest occurrence and damage. Although Helicoverpa armigera was showed a low occurrence frequency, it caused severe damage. We discussed the seasonal occurrence patterns of four pests-F. occidentalis, the alate A. gossypii, T. packardi and E. vitis-monitored by yellow-colored sticky traps.

• The Korean Journal of Pesticide Science
• /
• v.4 no.3
• /
• pp.27-33
• /
• 2000

N-Dimethoxyphosphinothionyl carbofuran, PSC, has a high insecticidal activity and low mammalian toxicity. Ten N-phosphinothionyl carbofuran derivatives were synthesized and their insecticidal activities were determined against brown plant hopper (Nilaparvata lugens), green peach aphid (Myzus persicae), diamondback moth (Plutella xylostella), and two-spotted spider mite (Tetranychus urticae). Green peach aphid, diamondback mea and brown plant hopper were controlled over 90% by application of 125 ppm, 125 ppm, and 63 ppm, respectively, of carbosulfan. Two hundred and fifty ppm of newly synthesized compounds could control most of brown plant hopper and diamondback moth. Especially, insecticidal activities of compound 10 against brown plant hopper, diamondback moth, and green peach aphid were similar to those of carbosulfan. Our results show that the newly synthesized derivatives of NV-phosphinothionyl carbofuran have a similar insecticidal activity to carbosulfan.