• 한국식품저장유통학회지
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• 제14권5호
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• pp.457-461
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• 2007

영주산 '후지' 사과의 전처리 및 포장방법별 저장기간 동안 품질변호를 알아보기 위하여 사과를 5% $CaCl_2$ 용액에 15분 동안 침지한 후 완전히 건조시켜 $25\;{\mu}m$ 두께의 LDPE 필름으로 박스단위로 포장하여 $0^{\circ}C$의 농협 현지저온저장고에서 21주간 중량감소율, 경도, 적정산도, 가용성 고형분함량, 비타민 C함량, 부패율 조사하였다. 중량감모율, 경도변화, Vitamin C 변화, 부패율 등에서 칼슘처리과 필름포장을 병행한 처리구(Ca-MA)가 다른 처리구에 비해 저장 중 품질변화가 가정 적은 것으로 나타나 영주산 '후지' 사과 저장시 선도유지에 효과적인 것으로 사료된다.

• 한국환경농학회지
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• 제42권3호
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• pp.239-252
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• 2023

Most apple trees in South Korea are grafted on M.9 and M.26 rootstocks; however, these rootstocks are susceptible to fire blight. Although M.7 rootstocks are moderately resistant to fire blight, they tend to exhibit excessive vigor, which is unsuitable for high-density planting, unless weak cultivars are used. This study investigated the vegetative growth, yield, and fruit quality of apple trees grafted onto M.7, M.9, or M.26 rootstocks to assess the feasibility of establishing high-density apple orchards domestically using the M.7 rootstock a period of seven years (1-7 years after planting). Rootstocks were tested using three cultivars with contrasting induced vigor and harvesting times: vigorous and late-maturing 'Fuji,' moderate vigor and middle-maturing 'Hongro,' and low vigor and early-maturing 'Sansa.' The planting density was maintained constant, with 190 trees per 10 a. Primary thinning (leaving only the king fruit on clusters) was performed, whereas secondary thinning (controlling crop load) was not. Vegetative growth, accumulated yield per 10 a, and yield efficiency varied depending on cultivars and rootstocks; however, the cultivars had a more notable effect on fruit quality than the rootstocks. Biennial bearing often occurred in the M.26 rootstock. 'Fuji'/M.7 was overly vigorous for high-density planting. The fruit quality and accumulated yield per 10 a of M.7 were similar to those of M.9 with the 'Hongro' and 'Sansa' cultivars. In particular, 'Hongro'/M.7 did not show tree vigor reduction due to heavy crop load, and the degree of biennial bearing in 'Sansa'/M.7 was not particularly high. These results indicated that high-density apple planting using the M.7 rootstock was achievable using the 'Hongro' and 'Sansa' cultivars.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 2000년도 동계 학술대회 논문집
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• pp.445-450
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• 2000

• 한국균학회지
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• 제51권2호
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• pp.111-120
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• 2023

Three fungal strains designated as KNUF-23-MG32, KNUF-23-YC8, and KNUF-23-MJ82 were isolated from the abnormal symptomatic apple trees during screening fungal pathogens collected in Jeollanam-do and Gyeongsangbuk-do, Korea. These fungal strains were found to have similar cultural and morphological characteristics close to the genus Botryosphaeria. Morphological characteristics were matched with B. kuwatsukai CBS 135219 but different with B. dothidea KACC 45481 and B. sinensis HMAS 246714^T. Pathogenicity tests of strain KNUF-23-MG32 showed that this strain causes rot in Fuji apples. Molecular phylogenetic analysis based on the sequences of the internal transcribed spacer (ITS) regions, translation elongation factor 1-alpha (TEF1α), and partial β-tubulin (TUB2) showed that these strains are B. kuwatsukai. To the best of our knowledge, this is the first report of an apple ring rot fungus Botryosphaeria kuwatsukai in Korea.

• 원예과학기술지
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• 제30권1호
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• pp.50-55
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• 2012

This study was carried out to evaluate the effect of pre-harvest factors on fruit quality and the incidence of storage disorders in 'Fuji' apple during CA storage. Incidence of storage disorders varied, depending on the growing regions, field conditions, and altitude of the orchards. Results indicated that fruit maturity may play a crucial role in the incidence and severity of flesh browning and watercore. The incidence of these storage disorders increased with fruit maturity until 180 days after full bloom (DAFB). In addition, occurrence of watercore was correlated with the incidence of flesh browning during CA storage. The incidence of flesh browning was positively correlated with the sum of the diurnal temperature range from September through October and amount of precipitation from August to October in 1996-1999 growing years. These results suggested that 'Fuji' apple should be harvested no later than 180 DAFB because the late harvested fruits were prone to development of watercore which was correlated with the incidence of flesh browing during CA storage in Korea.

• 한국식품저장유통학회지
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• 제14권1호
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• pp.105-108
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• 2007

거창과 서울에 거주하는 소비자로 20대부터 60대까지 남녀 280명을 대상으로 MA 필름으로 포장한 포장구 사과와 포장하지 않은 대조구 사과의 신선함, 단맛, 신맛, 향미, 아삭거림, 씹힘성, 구매의사에 대한 기호도를 조사한 결과 20대에서 신선함, 아삭거림, 씹힘성과 구매의사에서 대조구보다 포장구의 기호도가 유의적으로 높게 나타났다. 30대는 신선함, 신맛, 향미, 구매의사에서 40대는 향에서, 50대에서는 단맛과 향에서만 대조구보다 포장구의 기호도가 유의적으로 높게 나타났다. 그리고 60대에서 신선함, 향미, 구매의사에서는 대조구보다 포장구의 기호도가 유의적으로 높게 나타난 반면, 단맛, 신맛, 아삭거림에서는 포장구보다 대조구의 기호도가 유의적으로 높은 것으로 나타났다. 모든 연령에서의 대조구와 포장구 사과의 기호도는 맛의 특성 중 신선함(p=0.0011), 향미(p=0.0002), 구매의사(p=0.0018)에서 유의적으로 포장구가 높게 나타났고, 단맛, 신맛, 아삭거림, 씹힘성에서는 기호도 차이가 나타나지 않았다.

• 한국식품저장유통학회지
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• 제13권4호
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• pp.427-431
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• 2006

사과 저장시 전처리로써의 차압예냉이 품질 변화에 미치는 영향을 알아보기 위하여 중량, 경도, 산도, 당도, 부패율과 비타민 C의 함량을 무처리구와 비교 분석하였다. 중량은 저장기간에 따라 모두 감소하였으며 두 시험구간의 차이는 크게 나타나지 않았으나 최종 24주에 무처리 구가 낮게 나타났다. 경도는 전처리 직후 예냉군이 $1.04kg_f$, 대조군이 $1.17kg_f$였으나, 최종 24주 예냉구가 $0.89kg_f$로 대조구 $0.82kg_f$보다 더 단단하게 나타났다. 산도는 예냉처리구가 대조구에 비해 산도가 높아 변화가 적었으며, 당도 역시 대조구에 비해 예냉처리구가 당도를 유지하는 것으로 나타났다. 부패율은 24주에 대조구에서 46.4%의 부패율을 보인 반면, 예냉처리구는 34.5%로 상대적으로 낮은 부패율을 보였다 비타민 C는 전처리 초기의 함량이 9.52였으며, 24주엔 대조구가 3.67 mg%, 예냉처리구에서는 4.21 mg%로 나타나 예냉처리구의 감소율이 낮았다. 연구 결과사과의 차압예냉처리는 대조구와 비교하여 산도, 당두 경도를 유지하고 있었으며, 부패율을 낮추었으나 비타민 C 함량 변화에는 효과가 없는 것으로 나타났다.

• 한국환경농학회지
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• 제41권3호
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• pp.199-205
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• 2022

BACKGROUND: The freezing injury by pruning can be reduced by suspending pruning work when severe cold weather (-23 to -49℃) is forecast. Minimum air temperature of the study area, Gunwi region at February 3, 2012 was -21.9℃, and the subzero temperature continued until April 8, 2012. This study was conducted in two years to investigate the effect of delaying winter pruning until full bloom on shoot growth and fruit quality of 'Fuji'/M.9 apple trees. METHODS AND RESULTS: The time of pruning were March 26 for dormant, April 3 for bud break, and May 2 for full bloom. The winter pruning at full bloom significantly reduced fruit weight for two years compared with the control (winter pruning at dormant), and shoot growth was reduced only in the following year. There was no significant effect of delaying winter pruning at bud break on soluble solid content, fruit red color, return bloom, and pruning weight for two years compared with the control. CONCLUSION(S): These results indicated the delaying winter pruning at bud break of 'Fuji'/M.9 apple tree did not offer any disadvantage over comparable dormant pruning, since the fruit quality was not affected. The delayed pruning at full bloom resulted in decreased fruit weight, though shoot growth, fruit quality, and return bloom were not affected by the delayed pruning. So, the delayed pruning should be considered carefully only for the fruit tree orchards in diseases.

• 한국환경농학회지
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• 제42권2호
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• pp.104-111
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• 2023

As apple trees mature, it is important to maintain good light distribution within the canopy to produce marketable fruits. Tree thinning is the selective removal of a proportion of trees growing in the orchard to provide more growing space and a good light environment for the remaining trees. This study was conducted over 3 years (14-16 years after planting) to investigate the influence of tree thinning on vegetative growth, yield, fruit quality, and blooming in the 14 years old slender spindle 'Fuji'/M.9 apple trees planted with the tree space of 3.2×1.2 m. The trees were placed in a control group (no thinning; 260 trees per 10 a) or a tree thinning group (thinned 50% of the control; 130 trees per 10 a). The tree thinning successfully improved light penetration, yield per tree, fruit red color, and yield efficiency for 3 years, and the tree thinning controlled the occurrence of biennial bearing. However, tree thinning significantly decreased accumulated yield per 10 a compared with the control. The vegetative growth, yield per tree, soluble solid contents, and blooming were not clear by the occurrence of biennial bearing in the control. These results indicated that tree thinning was a good method for improving light penetration and preventing biennial bearing in the old 'Fuji'/M.9 high-density apple orchards.

• The Plant Pathology Journal
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• 제19권6호
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• pp.269-273
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• 2003

A total of 57 isolates of Colletotrichum gloeosporioides were recovered from diseased tissues of Hall's crab apple (Malus haliana), 3 cultivars of edible apple (M. pumila var. dulcissima), red pepper (Capsicum annum), and grapevine (Vitis vinifera) fruits. All isolates showed strong virulence on their own host plants. Isolates from edible apple exhibited high level of cultivar specificity in pathogenicity tests. Ten isolates from apple cultivar 'Fuji' were virulent on 'Jonathan' and 'Rall's Genet'. However, 12 isolates from 'Jonathan' and 'Rall's Genet' were not virulent on 'Fuji'. Among the 24 isolates from red pepper, only seven and two isolates were infective on edible apple and grapevine fruits, respectively. All six isolates from grapevine were only virulent on their own host. These isolates were grouped into five vegetative compatibility groups (VCGs), A, B, C, D, and E, by demonstrating heterokaryosis through complementation using nitrate-nonutilizing (nit) mutants. Among them, isolates belong to VCG-A and VCG-D accounted for 24 and 17 isolates； those in VCG-A exhibited wide host range involving Hall's crab apple, all three edible apple cultivars, and red pepper. On the other hand, isolates of VCG-D and VCG-E showed limited host range specific to red pepper and grapevine, respectively. Taken together, the data suggest that among C. gloeosporioides isolates, the concepts of pathotype and/or forma specialis may exist, and that three is a relationship between host specificity and VCG grouping among C. gloeosporioides isolates.