• Korean Journal of Plant Resources
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• v.34 no.1
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• pp.79-88
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• 2021

This research was conducted to investigate the genetic diversity and select useful accession with agronomic characteristics of garlic (Allium sativum L.). germplasms at Garlic Research Institute in Chungbuk Agricultural Research and Extension Service. Morphological diversity and relationships among 160 germplasms collected from 26 countries were assessed by methods of clustering and principal component analysis. Among 11 types of leaves and bulbs characteristics, emergence days of leaf showed the highest variation with coefficient of variation of 84.8%, and the bulb weight and the number of scales showed higher variability with 24.3%. Correlation analysis based on 11 quantitative traits showed that bulb weight and bulb length have very high positive correlation with bulb quantity. Plant height, leaf length, and number of leaves showed positive correlation with bulb weight as collections with better performance in growth produced large bulb with higher quality. The cluster analysis based on 5 principal components generated 6 clusters with an average distance of 1.6 among clusters. Domestic genetic resources were the largest with 36 species (22.5%) in group II.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.37 no.1
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• pp.37-44
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• 1992

Germinability, electrophoretic variation of protein of shattered seeds during overwintering and characteristic of main agronomic traits of off-type rice plant occurring in paddy field harvested by combine were investigated. Germinability of shattered seed decreased as time goes in paddy field in both Japonica and Tongil type varieties. Electrophoretic protein bands become more and more light as time goes. Occurrence of off-type rice plant was higher in Japonica varieties than in Tongil type varieties. Off-type rice plant was shorter in plant height, leaf length, tiller number per hill, internode length, panicle length and spike let number per panicle. Germinability of seeds of off-type rice plant as not significantly different compared to the control variety. Yield of off-type plants of Japonica varieties was on average 5.1kg / 10a and that of Tongil type varieties was on average 0.9kg /10a. Mixing ratio to the control variety was about 0.7% in Japonica varieties and that of Tongil type varieties was about 0.1%.

• Korean Journal of Medicinal Crop Science
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• v.11 no.5
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• pp.347-351
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• 2003

This experiment was carried out to study the optimal chilling period for breaking the physiological dormancy of dehisced E. senticosus seeds and to investigate the critical seeding date in Kangwondo. Storage at $5^{\circ}C$ for 85 days was most effective in breaking dormancy of dehisced seeds, but didn't germinated synchronously. Only 28.1% of undehisced seeds germinated after 125 days of low temperature storage. For improving seedling survival rate in the field, 50% shading was more effective than 30% shading. Delayed seeding date resulted in decreased seedling fresh weight, dry weight, leaf area and root length, but seeding date has no significant affecte on stem length.

• Korean journal of applied entomology
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• v.34 no.3
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• pp.229-233
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• 1995

The life history, seasonal occurrence of larval population and natural enemies of Tea leaf roller (Caloptilia theivora (Walshingham) were investigated in field-age. C. theivora had 6 generations a year. The developmental periods from egg to adult emergence were 32.1~38.6 days in spring and fall, and 24.8~32.7 days in summer. The average longevities of adults were 8.4~14.5 days in spring and fall, and 6.3~8.6 days in summer. The average number of eggs laid by a female were 55~71 throughout the season. Larval population density of C. theivora showed 3~4 peaks from middle may in 1992 and 1993. However, population density of 194 was pretty low in early season and exhibited a peak in late September-early October. C. theivora overwintered in pupal stage on the leaves. Four hymenopterous parasitoids of C. theivora larvae were identified ; they are Stenomesius japonicus (Ashmead), Sympiesis ringoniellae Kamijo, Elasmus sp., and S. dolichogaster Ashmead which is dominant.

• Journal of Forest and Environmental Science
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• v.11 no.1
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• pp.40-49
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• 1995

This study was carried out to investigated the developmental characteristics and spatial distribution of mango shield scale, Protopulvinaria mangiferae injuring to Elaeocarpus sylvestris(Lour.) This mango shield scale is parthenogentic. The oviparous female have three larval stages and adult. This species has two generation a year. The crawlers of the 1st generation emerged from late may to middle July, and those of the 2nd generation from early August to early October. Their emergence reached its peak in early part of the occurrence period. The crawlers disperse from 10 to 14 o'clock from ventral side of the adult and more than 90% had settled with in 8 hours on the leaves of E. sylvestris. The larvae and adults were distributed contagiously between trees. The adult densities were higher in the lower part of the crown than those in the middle or upper parts. But differents in densities were not significant among four directions. The distribution of the adult scales per leaf cluster showed an aggregation with a slightly colonized pattern.

• Korean Journal of Weed Science
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• v.9 no.3
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• pp.238-244
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• 1989

The experiment was carried out to evaluate the herbicidal properties of dithiopyr(3, 5-pyridine dicarbothioic acid-2-(difluoromethyl)-4-(2-methylpropyl)-6-(trifluoromethyl)-S,S-dimethyl ester). Weeding effect of dithiopyr was determined under various factors such as dosage, soil type, leaching amount, temperature, water depth, overflow time, and application time and method. Dithiopyr showed very high phytotoxic activity on most major annuals weeds, expecially Echinochloa crus-galli and Monochoria vaginalis. Excellent control of Echinochloa crus-galli was obtained at 0.04kg a.i./ha with preemergence application and 0.12kg a.i./ha with early post-emergence application (12 DAT ; Echinochloa crus-galli of 1.5 leaf stage). Weeding effect of dithiopyr decreased when applied at the soil surface 2days before transplanting. Soil type, leaching amount, temperature, water depth, overflow time did not affect the weeding effect.

• Korean Journal of Soil Science and Fertilizer
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• v.13 no.2
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• pp.71-76
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• 1980

Effect of soil moisture on growth of 2 year old Pan ax ginseng was investigated by pot culture using clay loam and sandy loam soils. In clay loam soil emergence rate of new shoot and stem growth were greatly decreased below 40% of field capacity. In sandy loam soil the growth of stem and leaf were greatly affected below 40% moisture. Root yield showed maximum at 60% moisture and significantly coorelated with stem diameter and root length. Rotten root rate and die back rate of top were least at 60% and gradually increased with either increase or decrease of soil moisture.

• Korean Journal of Medicinal Crop Science
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• v.7 no.1
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• pp.22-26
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• 1999

This study was investigated to elucidate the growth characteristics of Acanthopanax sessiliflorus grown under different conditions and seasons. The emergence percent of seeds sown in the vinyl house was about 2.2 times better than that in the open field. The plants which had 2 to 3 normal leaves showed the highest value in root setting percent, and the root setting percent was decreased significantly in plants with one normal leaf and 4 to 5 normal leaves. The root setting percent of plants transplanted from April 19 to May 2 was 100%, but plants transplanted at April 4 or from May 17 to June 1 showed lower root setting. Tree percent, plant height. root length and fresh weight of plants grown by transplanting culture were better than those of plants grown by direct seeding.

• International Journal of Industrial Entomology and Biomaterials
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• v.14 no.2
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• pp.127-135
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• 2007

Precocious metamorphosis was induced in two popular bivoltine breeds i.e. YB and $NB_4D_2$ by an imidazole compound having anti-juvenile hormone activity. The chemical was administered by feeding treatment with mulberry leaf to freshly moulted (0-6 hrs) IV instar larvae. The dose of the chemical was found to be breed specific being 650 ppm for YB and 500 ppm for $NB_4D_2$. The chemical caused complete skipping up of the fifth instar larvae which is most susceptible to diseases. But IV instar was somewhat prolonged. As a result the total larval period was reduced by 4-5 days. However, some of the rearing and reeling parameters like cocoon yield, cocoon weight, shell weight, shell %, filament length and fecundity were reduced for that particular generation only. The effective rate of rearing (ERR %) was significantly increased in trimoulters during the most unfavourable August - September seed crop season. Number of cocoons / kg and number of male moth were significantly higher in trimoulters. These may be useful for preparation of $multi{\times}bi$ hybrid seed. Fine denier was also found in trimoulter cocoon which is the cause of getting fine silk filament from trimoulter cocoons. Normal mating behaviour and emergence pattern was recorded in trimoulters. Bivoltine trimoulter males also showed competence for mating with multivoltine females. These results suggest the possibility of getting trimoulter males during hot and humid seasons when rearing of bivoltine is almost impossible particularly in Eastern and North Eastern India.

• FLOWER RESEARCH JOURNAL
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• v.16 no.2
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• pp.143-148
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• 2008

This study was conducted to investigate the effects of BA, a growth regulator on enhancing propagation efficiency, and physical treatment on promotion of axillary bud generation in three hosta cultivars, 'Ellerbroek', 'Francee', and 'Halcyon'. These are cultivars suitable for cut foliage production among Hosta spp. because of their diverse leaf patterns and long vase life of cut foliage. The degree of axillary bud generation by treatment time and concentration of BA has not been proven to be extraordinarily effective as compared to not treated control. As a physical treatment, base wounding was more effective than stem cutting. In 'Ellerbroek', increase of axillary bud generation among treatment methods was not great. However, in 'Halcyon', base wounding had four more axillary buds per plant than not treated control. In addition, although number of axillary buds increased per plant by BA treatment and stem cutting was 2 and 1.8, respectively, it was 6.1 by base wounding, indicating the greatest effect on promotion of axillary bud generation among all treatments.