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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean journal of applied entomology
Journal Basic Information
Journal DOI :
Korean Society of Applied Entomology
Editor in Chief :
Volume & Issues
Volume 14, Issue 4 - Dec 1975
Volume 14, Issue 3 - Oct 1975
Volume 14, Issue 2 - May 1975
Volume 14, Issue 1 - Mar 1975
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The Effects of Silicate Nitrogen, Phosphorus and Potassium Fertilizers on the Chemical Components of Rice Plants and on the Incidence of Blast Disease of Rice Caused by Pyricularia oryzae Cavara
Paik Soo Bong ;
Korean journal of applied entomology, volume 14, issue 3, 1975, Pages 97~109
In an attempt to develop an effective integrated system of controlling blast disease of rice caused by Pyricularia oryzae Cav., the possibility of minimizing the disease incidence by proper application of fertilizers has been investigated. Thus the effect of silicate, nitrogen, phosphorus and potassium fertilizers on the development of blast disease as well as the correlation between the rice varieties an4 strains of P. oryzae were studied. The experiments were made in 1971 and 1973 by artificial inoculation and under natural development of the blast disease on rice plants. The results obtained are summarized as follows. 1. Application of silicate fertilizer resulted in the increase of silicate as well as total sugar and potassium content but decrease of total nitrogen and phosphorus in tile leaf blades of rice plants. 2. The ratios of total C/total N.
N in leaf blades of rice plants increased by the application of silicate fertilizers. There was high level of negative correlation between the ratios mentioned above and the incidence of rice blast disease. 3. Application of silicate fertilizer reduced the incidence of rice blast disease. 4. The over dressing of nitrogen fertilizer resulted in the increase of total nitrogen and decrease of silicate and total sugar content in leaf blades, thus disposing the rice plants more susceptible to blast disease. 5. Over dressing of phosphorus fertilizer resulted in the increase of both total nitrogen and Phosphorus, and decrease of silicate content in the leaf blades inducing the rice plants to become more susceptible to blast disease. 6. Increased dressing of potash resulted in the increase of silicate content and
N ratio but decrease of total nitrogen content in leaf blades. When potassium content is low in the leaf blades of rice plants, the additional dressing of potash to rice plant contributed to the increase of resistance to blast disease. However, there was no significant correlation between additional potassium application and the resistance to blast disease when the potassium content is already high in the leaf blades. 7. When four rice varieties were artificially inoculated with three strains of P. oryzae, the incidence of blast disease was most severe on Pungok, least severe on Jinheung and moderate on Pungkwang and Paltal varieties. 8. Disease incidence was most severe on the second leaf from top and less sever on top and there leaf regardless of the fertilizer application when 5-6 leaf stage rice seedlings of four rice varieties were artificially inoculated with three strains of P. oryzae. 9. The pathogenicity of three strains of P. oryzae was in the order of
in their virulence when inoculated to Jinheung, Paltal, Pungkwang varieties but not with Pungok. The interaction between strains of P. oryzae and rice varieties was significant.
Studies on the Epidemiology and Control of Bacterial Leaf Blight of Rice in Korea
Lee Kyung-hee ;
Korean journal of applied entomology, volume 14, issue 3, 1975, Pages 111~131
The study has been carried out to investigate the occurrence, damage, characteristics of the pathogen, environmental conditions affecting the disease outbreak, varietal resistance, forecasting, and chemical control of bacterial leaf blight of rice in Korea since 1964. Bacterial leaf blight of rice became a major disease in Korea since 1960. A correlation was found between the annual increase of epidemics and increase of cultivation area of susceptible varieties, Jinheung, Keumnampung etc. Areal damage within the country showed that the more was at southern province, Jeonnam, Gyeongnam and western coast, and at flooded rice paddy. Yield reduction directly related with the amount of infection on upper leaves at heading stage. Fifty per cent of reduction resulted when the lesion area was more than 60 per cent. Less than 20 per cent of lesion area, however, was not affected so much on yield loss One hundred and six isolates collected from all over the country were classified as 8 strains by using 4 different bacteriophages in 1973. It was, however, only two in 1965. There were some specificities on varietal distributions among the strains such as that the Jinheung attacked mainly by strain A, B, C and I, those attack Kimmaze were A, B, H and I. Most strains were found from Tongil except D and E, whereas Akibare was only variety that attacked by strain E. Low temperature, high humidity, heavy rainfall and insutficient daylight favored the disease epidemics. Especially, typhoon and flooding at heading stage were critical factors. The earlier transplanting the more disease was resulted, and more nitrogen fertilizer application accerelated the diseased development in general. The resistance to the disease varied by growing stage of the sane plants. All of recommended varieties in Korea were susceptible to the disease except Norm No. 6 and Sirogane which moderately resistant. The pathogen, Xanthomonas oryzae, was detectable from extract of healthy seedlings that were grown in the field with an heavy infection previous year. The more bacteriophage in irigation water resulted the more disease outbreak, and the existence of more than 50 bacteriophages in 1ml. of irrigation water were necessary to initiate the disease out break. The curves representing occurrence of bacteriophages and disease outbreak were similar with 15 days interval. The survey of bacteriophage occurrence can be utilized in forecasting of the disease two weeks ahead of disease outbreak. Three applications of chemicals, Phenazin and Sangkel, in weekly intervals at the early satage of out-break depressed the symptom development, and increased yield by 20per cent. Proper period for the chemical application was just before the number of bacteriophage reaches 50 in 1ml. of irrigation water.
On the Influence of Susceptible and Resistant Soybean Varieties to the Development of the Soybean Cyst Nematode, Heterodera glycines (Heteroderidae, Nematoda)
Han Sang-Chan ; Lee Young-Bae ;
Korean journal of applied entomology, volume 14, issue 3, 1975, Pages 133~136
Influence of susceptible and resistant soybean varieties to the development of the soybean cyst nematode(Heterodera glycines) was examined. It does not seem likly that there are any differences between varieties in attracting the Second Stage larvae of the nematode. In susceptible varieties, there were large populations and three generations during a ten·week examination period, while the resistant varieties maintained very low populations and had only two generations.
Studies on the Seasonal Occurences of the Tobacco Budworm, Heliothis assulta H. (Lepidoptera: Noctuidae), and the Parasitism Ratio of Trichogramma spp. on the Eggs.
Choi K. M. ; Cho E. H. ; So J. S. ; Hwang C. Y. ;
Korean journal of applied entomology, volume 14, issue 3, 1975, Pages 137~140
Field experiments on red-pepper were conducted in Suweon area during 1972-1974 to determine the seasonal fluctuation of Heliothis assulta H. using black light traps and direct counts. Adult moths emerged in late May, and showed three peaks of fluctuation from late June to middle July, from middle August to late August, and in mid-September. Eggs were first discovered in the field in early July, with peak incidence Iron late August to early September. Larval peaks occurred in late July to early August, in late August and mid-September to mid-October Initial hatching in the field occurred in early July. The numbers of the first larval generation were the highest. The parasitization ratio of Trichogramma spp. on eggs averaged 51 percent during mid-July to mid-September. The numbers of Trichogramma spp. emerging from one tobacco bud-worm egg ranged from one to four, but in most cases one or two egg parasitizing wasps emerged.
On the Effects of Emulsifiable DBCP for Control of the Citrus-root Nematode, Tylenchulus semipenetrans in Two Citrus Orchards
Lee Young-Bae ; Han Sang-chan ; Park Joong-Soo ;
Korean journal of applied entomology, volume 14, issue 3, 1975, Pages 141~146
Experiments were carried out to know the effects of emulsifiable DBCP, (Dibromo Chloropropane) for control of the citrus-root nematode, Tylenchulus semipenetrans in Orchards of chinese citron and mandarine orange for four years of 1967-1970. Nematode population density decreased as the amount of DBCP increased. In mandarine orange orchard, the nematode population density decreased after second treatment mainly because of bad drainage of the soil, while in Chinese citron orchard, it fell off sharply after just one treatment since the soil was well drained. Yields of Chinese citron increased as much as
in 4.4l/10a injection, 1
in 4.4l/10a drench; yields of mandarine orange increased as much as
in 4.41/10a injection and
in 4.4l/10a drench.
Root-zone Application of Insecticides in Gelatin Capsules for the Control of Rice Insect Pests
Choi S. Y. ; Heu M. H. ; Chung K. Y. ; Kang Y. S. ; Kim H. K. ;
Korean journal of applied entomology, volume 14, issue 3, 1975, Pages 147~153
During 1973 a field experiment was carried out to evaluate effectiveness of the root zone application of insecticides in medical gelatin capsules for control of several rice insect pests and dwarf virus disease. At three days after transplanting the capsules were pushed by hand about 2.5cm into the soil, near roots of Tongil rice plants. At the given day intervals number of leaf-and plant-hoppers on the hills were recorded by direct count, and dead hearts and white heads by stem borers and dwarf virus infected hills were observed in the experiment plots. Finally grain yields were measured. The percentages of dead hearts and white heads in all the plots were too low for evaluating the effectiveness of insecticides against the striped rice borers. Carbofuran of the insecticides tested was relatively effective against green rice leafhopper (Nephotettixcincticeps) and small brown planthopper (Laodelphax striatellus), although small number of insects on the hills were recorded. Relatively small number of white-backed planthopper (Sogatella furcifera) was occured in the BPMC and Diazinon treated plots. BPMC and Carbofuran were highly effective against the brown planthopper (Nilaparvata lugens) to 80 days after treatment. Incidence of dwarf virus disease was least in the plots of Carbofuran treatment. The highest grain yield was recorded in the plots treated with Carbofuran, and it seemed to be related with good protection from the dwarf virus disease and leaf-and plant-hoppers.
Studies on the Plant Plant Pathogenic Corynebacteria; The Synthesis of B Group Vitamins by Plant Pathogenic Bacteria
Kim Jong-wan ; Mukoo Hideo ;
Korean journal of applied entomology, volume 14, issue 3, 1975, Pages 155~161
The results of studies on the synthesis of B group vitamins by plant pathogenic bacteria indicate that most bacteria utilize thiamine, nicotinic acid, biotin and P-Aminobenzoic acid as growth factors. Riboflavin (vitamin
) was produced by most bacterial genera including the Corynebacteria but with the exception of C. rathay and C.fasciant. The results suggest that the ability to produce riboflavin is not a generic characteristic of Corynebacterium, and that the accuracy of the ultra-violet light method (one of the diagnostic tests for potato bacterial ring rot disease caused by Corynebacterium sepedonicum) must he reconsidered.
Study on Stable Fly Eradication by Sterile-male Technique (4) Effects of X-ray Irradiation on the Stable Fly
Chung K. H. ; Ryu J. ; Kwon S. H. ;
Korean journal of applied entomology, volume 14, issue 3, 1975, Pages 163~166
This experiment was performed to investigate the X-ray sensitivities at the various stages of life cycle and to determine the sterillizing dose of stable fly, Stomoxys calcitrans(L). A dose of 300 rad caused about
mortality in 2-hour-old eggs as measured by egg hatch, and
mortality was obtained with a does of 1 Krad. Sub-lethal dose
for the pupal mortality after irradiation of 3-5days old pupae were 11.5 Krad and the mortality was decreased with increasing pupal age at irradition. A significant reduction of egg hatch by
was observed when treated males with 3 Krad at pupal stage were mated to untreated virgin femleas. On the other hand,
sterility in females was resulted by 2 Krad irradiation and oviposition was completely inhibited with 3 Krad. Thus, both sexes of stable fly could be sterilized with a dose of 4 Krad irradiated to 3-5 days old pupae.
연초의 연구 동향(육종을 중심으로)
Korean journal of applied entomology, volume 14, issue 3, 1975, Pages 167~171
Present Status and Control of Tobacco Plant Diseases and Insects
Heu Il ;
Korean journal of applied entomology, volume 14, issue 3, 1975, Pages 173~177