• International Journal of Industrial Entomology and Biomaterials
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• v.15 no.2
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• pp.157-160
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• 2007

Nymph of the emma field cricket, Teleogryllus emma, were reared on several types of artificial diets. The development period of nymphs were 55.4 days when only a single food, wheat bran, was provided, and it did not show a significant difference compared to the rearing results of the Danong diet and mixed diet. The supplying period of fish meal as the animal feed, the high emergence rates were obtained at 3rd instar with 90% and 4th instar with 100%. For the added amount test, when more than 40% of the diet was added, it confirmed that the insect weight increased. The characteristics of development according to each added amount of the vegetable food (dry bean-curd residue and corn powder) were investigated to minimize the dangers of the degeneration of diet when rearing with a single feed during the $1st{\sim}3rd$ instar period. First, as the added amount of bean-curd residue increased, nymphal development period became longer and the emergence rate became low. With corn powder as the single diet, all died before becoming adult. However, when corn powder was added up to 30%, no difference existed in the breeding results.

• Korean journal of applied entomology
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• v.44 no.1 s.138
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• pp.61-65
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• 2005

Egg-forming and preservation methods for the indoor-rearing system of the emma field cricket, Teleogryllus emma, were investigated. The oviposition preference experiment on different mats, soil(natural oviposition mat) and $oasis^{\circledR}$(artificial oviposition mat), showed that T. emma preferred to oviposit on the $oasis^{\circledR}$. On the other hand, $oasis^{\circledR}$ had more inactive number of eggs laid per female and hatchability than another. However, the number of eggs laid per female and hatchability within 50 days after emergence were better than soil. The experiment on the hatching of the eggs showed that eggs could be stocked at $10^{\circ}C$ for 40 days with 14 day pre-period after laying, representing $62.1\%$ hatchability, when considering generation shortening. On the other hand, When it had been kept in cold storage for 90 days at $7.5^{\circ}C$ with 14 day pre-period after laying it, appeared to be the most suitable for long period-storage method by hatchability $65.1\%$.

• Korean Journal of Ecology and Environment
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• v.46 no.1
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• pp.67-74
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• 2013

This research was conducted to investigate the competition for survival between the two cricket species: Gryllus bimaculatus (GB) and Teleogryllus emma (TE). The test insects for this research were bred in the greenhouse of the Ecological Entomology Lab, College of Agriculture and Biosciences, Kyungpook National University, Korea. The feeding environment was $28^{\circ}C$ to $30^{\circ}C$, Long-Day condition (16L : 8D) and Relative Humidity: 50%~60%. The changes of the individual number in two species (TE, GB) were checked every day. This research had three experimental conditions which the ratios of individuals (TE : GB) were set at 1 : 2, 1 : 1 and 2 : 1. The survival rate of GB was net better than that of TE in the result of this study. However, due to the absence of the diapauses period in the egg stage, GB would dominate over TE in the field condition. The appropriate legal measure against GB is recommended.

• Journal of Life Science
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• v.27 no.9
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• pp.1040-1046
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• 2017

We describe the isolation and characterization of six different intestinal microorganisms from the digestive tract of the cricket Gryllus bimaculatus. Based on 16S rRNA gene sequences, we obtained six isolates belonging to four different genera: Staphylococcus, Bacillus, Citrobacter, and Proteus. All the isolates were resistant to ampicillin. Ampicillin is an irreversible inhibitor of the enzymeetranspeptidase, which is needed to make bacterial cell walls. None of the isolates were resistant to kanamycin, which binds to the 30S subunit of the bacterial ribosome and then inhibits total protein synthesis. Gram staining was conducted, in addition to morphological classification under a microscope. Four grampositive isolates and two gram-negative isolates were detected. The gram-positive isolates were GL1 (round shaped, 2 am in diameter), GL2 (rod shaped, $2.5{\mu}m$ in length), GL3 (rod shaped, $2{\mu}m$ in length), and GL4 (round shaped, $1.5{\mu}m$ in diameter). The gram-negative isolates were GL5 (rod shaped, $2{\mu}m$ in length) and GL6 (rod-shaped, $2.5{\mu}m$ in length). Notably, two of the isolates, GL2 and GL4, secreted specific extracellular proteins. These were determined by MALDI-TOF-MS spectral analysis to be a 87 kDa collagenase, 56 kDa hypothetical protein, and 200 kDa hypothetical protein. The six isolates in this study could be used for various biotechnological applications and pest management, both in the field and in greenhouse systems. In addition, it would be interesting to determine the relationship between these isolates and their host.

• Korean journal of applied entomology
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• v.32 no.1
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• pp.76-82
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• 1993

Phonotaxis of the African mole cricket, Gryllotalpa africana palisot de Beauvois, was investigated in 1990 and 1992 at the agronomy Experiment Station of Korea Ginseng & Tobacco Research Institute in Hwaseong-gun, Kyonggi-do, Male adults produced calling sounds (calling songs) through the openings of subsurface burrows. Intensities of the sound were 77-80 dB at 15 cm above the openings. When tape recordings of male calling songs were broadcasted outdoors at 105-110 dB by two horn speakers installed at the center of a 1.4 m diameter-funnel, flying adults were attracted for 1.5 hours from about 30 minutes after sunset. Among attracted adults, 14.3-16.9% landed in the funnel, and 65.7-74.7% landed on the ground within 2m form the sound source. Females were 66.7-74.3%, which seemed to be due to the sex ratio of the population in the field. Adults landing in the funnel and at the distance of within 2m from the center of the funnel were tend to be a little more than those attracted to a blacklight trap.

• International Journal of Industrial Entomology and Biomaterials
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• v.25 no.2
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• pp.175-179
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• 2012

The present study is to develop the rearing method of Gryllotalpa orientalis. In total 429 of G. orientalis were collected from the field rearing cage ($25m^2$) in 2012. Its sex ratio was 1: 1.15(Female : Male). Survival rate of the mole crickets was 94.4~86.1% with the artificial diets formulated for the present study. Successful oviposition rate was 20, 20 and 80% for one, two and three pairs of adult crickets, respectively, from the indoor rearing. The mean number of hatchlings was $11.8{\pm}21.7$, $15.7{\pm}26.4$ and $25.8{\pm}38.8$, and the mean number of dead hatchlings 1.2, 1.7 and 1.2. The mortality of nymphs on horticultural soil and clay sand mixed with ocher was 18.3 and 10.0%, respectively. The mortality of nymphs in circular and rectangular cages was, respectively, 60 and 40%.

• Korean journal of applied entomology
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• v.39 no.4
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• pp.281-286
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• 2000

Non-chemical or low-chemical control measures against key insect pests and rats in the ginseng field were studied from 1993 through 1999. Broadcasting chemicals beside the ginseng field in the oviposition period showed the same control effect on the adults of the Korean black chafer, Holotrichia diomphalia, as broadcasting at the ginseng ridge. Ginseng damage by adults of African mole cricket, Gryl1ota1pa africana, were reduced considerably by broadcasting chemicals beside the ginseng field. The larvae of wheat wireworm, Ectinus sericeus, were attracted effectively to potatoes in the ginseng field. Spreads of the mealybug, Pseudococcus comstocki, were very slow in the ginseng field, indicating that it is possible to eradicate the early colonies of Pseudococcus comstocki effectively. The rat repeller, Dekur $500S^{showed}$ a significant control effect of rats in the ginseng field.

• Korean journal of applied entomology
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• v.34 no.1
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• pp.70-74
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• 1995

A study on seasonal changes in age structure and fecundity of Gryllotalpa africana Palisot de Beauvois was conducted in Suwon from 1991 through 194. It seemed that most of newly hatched nymphs emerge to adults in September and October, so have a life cycle a year, and some overwinter as nymphs and emerge to adults from August, so have a life cycle tow years. The mean number of eggs per cell was $36.00\pm$2.84 for egg cells laid in the laboratory, and $47.68\pm$4.35 for egg cells collected in the field. Mean and range of the numbers of egg cells produced per female were $1.17\pm$0.19 and 0~3.

• Journal of agriculture & life science
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• v.44 no.1
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• pp.43-49
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• 2010

Life history of Gampsocleis sedakovi abscura Walker, an amenity sound producing insect, was investigated in Jinju, Korea from 2005 to 2007. G. sedakovi abscura had a generation per year and could be seen in the field from early March to late September. The peak emergence period of adults was early July. Developmental period from egg to adult was 357 days in average of three years in the field. Egg and nymphal periods, and adult longevity were 269, 88, and 357 days in average, respectively. The average ovipositional period was 63 days, and an adult laid 94 eggs in average throughout her life. The average longevity of adult was 90 days for female and 82 days for male. The sex ratio was 52%. G. sedakovi abscura over-wintered as egg stage in the soil. Circadian rhythm of the adult emergence showed that more than 70% of the adults emerged in the morning.