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Consumer satisfaction with insect-related products for feed
Changmann Yoon,Sun Kook Kim,Ki-Su An,Sun Hwa Lee,Ik-Jei Kim,Seong Taek Hong 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.10
The consumer satisfaction level for insect products for feed was investigated in order to be used as a basic data for the establishment of the insect industry. The survey was conducted on 302 ordinary citizens aged 19 to 59 on consumer satisfaction with insect-related products for feed. When insect is supplied as a food source, most consumers are purchased for reptiles (66.7%). Asking about food type, most of them answered that they buy food in living form (83.3%), which is higher than dry form (16.7%). The kind of insect-related products for feed were in the order of crickets (83.3 %) > mealworm (16.7 %). The frequency of use of the product was once (66.7%) > 2 to 3 times a week (16.7%) > 2 to 3 times a month(16.7%). Consumer satisfaction with insect food for feed was average, but they said they were relatively satisfied with the quality, the route of purchase and the nutritional content.
Changmann Yoon,Gil-Hah Kim,Dong-Kyu Seo,Jeong-Oh Yang,Shin-Ho Kang 한국응용곤충학회 2010 Journal of Asia-Pacific Entomology Vol.13 No.4
The predatory multicolored Asian lady beetle, Harmonia axyridis, was attracted to volatiles released from Chinese cabbage infested by the green peach aphid, Myzus persicae, in T-tube olfactometer choice tests. However, lady beetle adults and larvae did not respond to clean air, Chinese cabbage alone or green peach aphid alone. Of different prey densities, H. axyridis adults were most attracted to Chinese cabbage infested by 60 M. persicae adults after 24 h. However, H. axyridis larvae were not attracted to Chinese cabbage infested by M. persicae. Mechanically damaged Chinese cabbage attracted neither lady beetle adults nor larvae. Predatory adults were attracted to 60 M. persicae adults after 24 and 48 h, and to 90 M. persicae adults after 12 h,suggesting that the predatory response depends on the prey density. Lady adult beetles did not prefer the volatiles induced by Diamondback moth, Plutella xylostella, indicating that specific host insect specificity attracts respective natural enemies. It can be explained that the volatile compounds emitted from the host plant as a result of herbivore attack preferred by the specific insect species.
Changmann Yoon,Gil Hah Kim,Sang-Rae Moon,Jin-Won Jeong,Youn-Ho Shin,Sun-Ran Cho,Ki-Su Ahn 한국응용곤충학회 2011 Journal of Asia-Pacific Entomology Vol.14 No.4
This study was performed to investigate the repellent effect of 5 μl doses of ten essential oils (bergamot,chamomile, clary sage, fennel, lavender, lemongrass, majoram, peanut, pennyroyal, and peppermint) against Lycorma delicatula 4th nymphs using an olfactometer. Only lavender oil exhibited significant repellency. We then tested 10, 5, 2.5, and 1 μl doses of lavender oil against the nymphs and females of L. delicatula. The oil showed significant repellency at 10 and 5 μl, although the latter is less potent to 1st instar nymphs. At the lavender oil dose of 2.5 μl, only 3rd and 4th instar nymphs and females were significantly affected. None of the stages tested were affected by 1 μl. Chromatographic and mass spectrometric analyses of lavender oil detected linalool (42.2%), linalyl acetate (49.4%), terpinen-4-ol (5.0%), and caryophyllene oxide (3.4%). Among the four main components, only linalool showed repellency to all instar nymphs and females. No synergism was detected. Antennae of all instar nymphs and females showed electrophysiological responses only to linalool. In field studies using linalool, 4th nymphs and adults were highly repelled at a dose of 30 μl of lavender oil. The effect differed according to test plot and treatment dose.
Yoon, Changmann,Yang, Jeong-Oh,Youn, Young-Nam,Kim, Gil-Hah 한국응용곤충학회 2012 Journal of Asia-Pacific Entomology Vol. No.
The function of "cuticular hydrocarbons" (CHCs) in insects is to protect the body as well as chemical communication and recognition between species. Gas chromatography and mass spectrometry were used to compare the composition of CHCs in eggs, all nymph instars, and male and female adults of the bean bug, Riptortus pedestris (Hemiptera: Alydidae). CHC carbon chain numbers of each developmental stage ranged from 14 to 19 in eggs to the fourth nymph and were 24 in the last nymph. CHCs' carbon chain numbers in male and female adults increased from 16 to 23 and 16 to 27 until 6 days of age, respectively. Major components consisted of n-nonacosane in the larval stages, which changed to n-hentriacontane, n-heptacosane and 13,17-;15,19-demethyltritriacontane in adults. The major component from eggs was not identified. The major component from newly emerged adults was n-heptacosane. CHCs in different developmental stages of the bean bug consisted of n-alkanes with saturated hydrocarbons (27-63%), followed by mono or dimethyl alkanes. However, the CHCs of newly emerged female and male adults consisted mostly of methylalkanes. The major constituents of CHCs in the developmental stages of R. pedestris were proportionally different but showed only slight differences in composition.
Spray Adulticidal Effects of Plant Oils against Culex pipiens pallens (Diptera: Culicidae)
Changmann Yoon,Shin-Ho Kang,Gil-Hah Kim 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.05
We examined the adulticidal activity of 34 plant essential oils when they were sprayed on female Culex pipiens pallens adults. At concentrations of 1000 ppm, four oils, namely, cardamon, coriander, rosemary, and sandalwood, had adulticidal activities ranging from 67.8% to 98%. Sandalwood oil had the highest adulticidal activity with an LC50 value of 445ppm. Gas chromatographic (GC) and GC-mass spectrometric analyses revealed that the major constituents of cardamon were 1,8-cineole, α-terpinolene and α-terpinene; those of coriander were γ-terpinene, camphor, linalool and geranyl acetate; those of rosemary were β-pinene, 1,8-cineol, camphor and linalool; and those of sandalwood were α-santalol (69.4%) and β-santalol (15.3%). Both of the major components of sandalwood had the highest adulticidal activity of all the monoterpenes tested. When inhibitors of enzymes known to promote insecticide resistance were mixed with each of the four essential oils, a synergistic effect was only observed when sandalwood was mixed with 100 ppm PBO, which enhanced the adulticidal activity of 500 ppm sandalwood from 41% to 90%.
Changmann Yoon,Jeong-Oh Yang,Sang-Rae Moon,Gil-Hah Kim 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.05
This study was performed to investigate the feeding behavior of Bemisia tabaci B- and Q-biotypes using EPG technique against seven tomato and eight red pepper commercial varieties. EPG waveforms was recorded during three hours compare with the characteristic patterns of feeding behaviors between two biotypes such as total duration of non-probing times, the time taken until stylet activities changed after reaction, number of probes, and total duration of phloem phase. In comparing the effect of the varieties between the two biotypes, biotype Q showed the feeding behavior against all pepper varieties in the total duration of phloem feeding. Daeshin variety has the longest feeding time. However in total duration of phloem feeding, biotype B was observed in hanyeoreumbigarim and Daeshin varieties, but feeding time was very short. Biotype B was longer in total duration of non-probing, and showed lower number of probes, and total duration of probing phase. However, biotype Q was shorter time in total duration of non-probing phase than biotype B, but showed more aggressive probing and stylet pathway pattern. These results suggest that biotype Q are more preferred the pepper host than biotype B. However, tomato varieties between the two biotypes did not show the difference.
Changmann Yoon,Gil Hah Kim,Youn-Ho Shin,Jeong-Oh Yang,Ju-Hwan Han 한국응용곤충학회 2011 Journal of Asia-Pacific Entomology Vol.14 No.3
This study was conducted to investigate the longevity, reproduction and ovarian development of M. saltuarius adults feeding on Pinus koraiensis twigs of three different age classes (current-year, 1-year and 2-year). Longevity and fecundity of female adults decreased with increasing twig age class (58.4, 41.9 and 35.9 days,respectively, for longevity and 43.0, 13.2 and 6.6 eggs, respectively, for fecundity). In ovarian development,the average follicle size after 1 week of feeding on current-year twigs was 3.1–3.5 times greater than those of beetles fed 1- and 2-year-old twigs. After 2 weeks of feeding, follicle size was 2.3–2.4 times greater than those of beetles fed 1- and 2-year-old twigs. These results showed that current-year twigs of P. koraiensis increase longevity and reproduction of M. saltuarius. By analyzing sugars using high performance liquid chromatography (HPLC), the quantity of fructose was found to be highest in current-year twigs and lowest in 2-year-old twigs. A sugar feeding bioassay indicated that fructose was preferred by M. saltuarius. Therefore,fructose is important to adult feeding and ovariole development in M. saltuarius.
Changmann Yoon,Ki-Su Ahn,Gil-hah Kim 한국응용곤충학회 2010 한국응용곤충학회 학술대회논문집 Vol.2010 No.05
Insect pest may move to near area to forage the food by adverse changes of their environments. Understanding these behaviors of searching the host will be helpful for further control. This study was performed to investigate the host preference and distribution of B. tabaci in a host plant when they needs. Once entered an area including hosts, B. tabaci will select a host rather than non-host and stayed for living. Dispersal within a niche (in a whole plant), B. tabaci was observed in lower part in tobacco and middle in tomato when seedlings, but they dispersed throughout the whole fully grown tomato plants with irregular inclined to the under, outer stretched leaves. Bemisia tabaci was also caught massively in yellow sticky traps in height of 30 cm above soil, and 30 cm above a plant. There was no attraction effect by flower model traps and fly catcher. When introduced with different densities (0, 10, 50, 100, 200, and 400) in square cages, the B. tabaci do damaged at the densities of 200 with mild and 400 with severe symptom on plants in two weeks and four weeks after inoculation.