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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 16, Issue 4 - Dec 1977
Volume 16, Issue 3 - Sep 1977
Volume 16, Issue 2 - Jun 1977
Volume 16, Issue 1 - Mar 1977
Selecting the target year
'Kresek' Disease in Korea. I The Grouping of the Pathogens and Reproduction of 'Kresek'
Choi Yong Chull ; Cho Eng Haeng ; Chung Bong Jo ; Cho Yong Sup ; Yoo Yeon Hean ;
Korean journal of applied entomology, volume 16, issue 1, 1977, Pages 1~6
The 'Kresek' disease in Korea caused by Xanthomonas oryzae was first found from eight counties in Jeon-nam and Kyungnam province in 1976. The study has been carried mainly on the grouping of pathogens and reproduction of the symptoms on Milyang #23, the variety had shown severe damages at the fields, by using the isolates from Hwa-sun and Kwang-san counties where the first epidemics took place. 1. The 'Kresek' disease was found mainly on Milyang #23, a new variety, at Hwa-sun, Mu-an, Kang-jin. Yung-am, Gog-sung counties in Jeon-nam province and Jin-yang county in Kyung-nam province. 2. The groups of 'Kresek' causing pathogens were the same of those producing bacterial leaf blight symptoms such as group I , II, IN and V of Xanthomonas oryzae. 3. Seventeen out of 21 isolates from Hwa-sun county where the first and severe damage found belonged to group IV, 2 to group II and 2 to group V All of 5 isolates from Kwang-san county belonged to the group IN. 4. The 'Kresek' type symptom could reproduced within 5 days after inoculation to seedlings by using root tut, spray and needle inoculation methods. j. The most of effective method for the inoculation was root cut, and then were spray and needle method. respectively. The higher concentration of inoculum produced the higher disease incidence.
Studies on the Establishment of Weed Control System 1. Determination of the Optimum Weeding Date for Barley Growing in Paddy Condition
Choi J. S. ; Han K. S. ; Choe Z. R. ;
Korean journal of applied entomology, volume 16, issue 1, 1977, Pages 7~12
In order to find out the optimum weeding date for growing barley in paddy field, several kinds of weeding dates and frequencies were made and compared. The results are summarized as follows: 1. As far as the weeding frequencies were fixed with one time, an immediate weeding after wintering resulted better barley grain yield and yield components by causing decreased yield of weed. 2. Maximum allowable date to be free from the weed competition were estimated as not late than February 10 or at most february 25. 3. It is considerable that the effect of weeding was continuously found till March 11 but no significant weeding effect was found when the weeding was done after April. 4. The competition of weed and barley was relatively so higher from February 25 to March 30 that the control during this period seemed to be very effective by causing little decrease in barley grain yield. 5. Major overdominant weeds observed in the paddy field for barley growing period were Alopecurus aequalis S., Stellaria alsine G., and Galium aparin L., in the order of degrees.
Studies on the Seasonal Increase of the Population of the Smallerbrown Planthopper, Laodelphax striatellus(Fallen)
Hyun Jai Sun ; Woo Kun Suk ; Ryoo Mun Il ;
Korean journal of applied entomology, volume 16, issue 1, 1977, Pages 13~19
The smaller brown planthopper overwinters mostly as the fourth instar nymph. The emerged adult disperses to winter barley or wheat plants. The adult of the first generation disperses into the rice field, and spends three generations in the rice field. The population densities of the adults of the first generation and the overall density of the second generations are the most important in relation to the incidents of the rice stripe disease which is transmitted by this insects. This study was intended to analyse the population increases in these important generations in relation to the kind and the different growing stage of the host plants. The insects were reared on potted host plants of different growing stage in the insect cages. The population increases of the insects in the cages were compared with those on the rice seedlings in the laboratory. The results are as follows: 1. The average longevities of the adults of the generations were 13.4 days for the overwintered, 12.9 days for the first, and 10.2 days for the second generation, and showed no significant differences between the generations even they seemed to be shorter than normal condition probably caused by the frequent disturbance at the time of food renewal in 2 or 3 days. 2. When they were reared on the rice seedling, the average numbers of the eggs per female were 131.2 for the overwintered generation, 124.9 for the first generation grown on the barley, and 142.3 for the second generation grown on rice, and shelved no significant differences between the generations. More than
of the eggs were laid within 3 weeks. 3. The hatchabilities of the eggs laid on the rice seedling in laboratory were
for the first generation,
for the second generation and
for the third generation. The estimated hatchabilities of the eggs were
for the first generation,
for the second generation, and
for the third generation with the growing plants on the plots. The hatchability on the eggs laid by the adults infested on the barley on May 17 was
for the eggs laid by those infested on barley in late April. 4. The average total nymphal periods were 19.4 days for the first generation, and 13.3 days for the second generation in the laboratory and the mortalities of the nymphs seemed to related with the growing stages of the host plants. 5. With the pot experiments, the average per cents of the emerged adults were
for the first generation,
for the second generation, and
, for the third generation. The average numbers of the emerged adults were
for the pots infested on the barley on May 17, instead of
adults for those infested in late April. 6. From above results, it may suggest that the innate qualities of the insect are not significantly different between generations, and the differences in the increase of the population for the generations might effected considerably by the differences in the physiological conditions of tile host plant, besides the differences in physical and other biological factors.
The Study on Rough Colony Type Mutant of Pseudomoms mori(Boyer et Lambert) Stevens, caused Mulberry Bacterial Blight: Pathogenicity and General Characteristics
Yi Young Keun ; Kim Jong Wan ; Cho Yong Sup ;
Korean journal of applied entomology, volume 16, issue 1, 1977, Pages 21~31
The study has been carried out to compare the pathogenicity, physiological characteristics and genetic reliability between rough colony type strain and smooth colony type strains of Pseudomonas mori (Boyer et Lambert) Stevens which were isolated from diseased plant parts in 5 different areas throughout country. The results are summarized as follow. 1. The rough colony type strain showed more agressive reactions to tested host plant varieties than smooth colony type strains though there was no differences in the appearence of lesion types caused by both strains. 2. Both colony types were differentiated morphologically in that the rough colony type strain was having more than 200r long filamentous body without flagella where as the smooth colony type strains have short rods with one or several polar flagella. 3. The colony of smooth type strains was circular, entire, smooth and opaque, while the rough type strain shelved endulated, irregular margin, rough and wrinkled colony on nutrient agar media. 4. There were no differences between both colony types in the physiological and serological test. 5. Both of smooth and rough colony type strains showed genetic reliability through more than 100 succeeding cultures on the media, and were stable to various chemicals such as 1 to 3 percent of NaCl, 5 kinds of organic acid and 4 kinds of antibiotics.
Lepidopterous Insect Pests on Apple Tree
Park K. T. ; Choe K. Y. ; Paik J. C. ; Han S. C. ;
Korean journal of applied entomology, volume 16, issue 1, 1977, Pages 33~39
The Present survey was conducted to clarify species of moths infesting apple and the general biology of the dominant species as a basis for effective control. From the results of a survey in Suweon area, 24 species of leafrollers, 3 species of fruit-moths, 4 species of leaf-miners, 4 species of fruit-piercing moths and 28 other leaf-feeders were identified as pests of apple or apple trees.
Control of Some Insects on Soybeans with Granular Systemic Insecticides applied in Seeding-pits
Choi Seung Yoon ; Lee Hyung Rea ;
Korean journal of applied entomology, volume 16, issue 1, 1977, Pages 41~45
The systemic insecticides carbofuran
were evaluated in the field for conrol of some insects on soybeans when the insecticides were applied in seeding-pits at the rates of 4.6, 9.2 and 13.8 mg(a.i)/pit at the planting time. Control of the soybean aphid (Aphis glycines Matsumura) and the two-spotted spider mite (Tetranychus telarius(L.)) on soybeans was obtained for about 2 to 3 months, but their treatments were ineffective against the soybean moth (Grapholitha glycinivorella Matsumura). For the control of aphids and mites, disulfoton was better than carbofuran and mephosfolan. The insecticides slightly reduced the soybean stands, while the low-dose treatments of carbofuran slightly increased the stands. Carbofuran and mephosfolan caused severe phytotoxicity at the early stages, but disulfoton showed slight or negligible phytotoxicity. The phytotoxic symptoms in carbofuran and mephosfolan treatments were shelving the large number of brown or black-brown spots on the cotyledon and the first-leaves, and in addition to that showing necrosis along the leaf-margin. The symptoms in disulfoton treatments were slight withering along the leaf-margin of the first-leaves. In spite of good control of aphids and mites, there were no differences in soybean yield.
Studies on Bacterial Diseases of Soybean
Cho Yong Sup ; Yoo Yeon Hean ;
Korean journal of applied entomology, volume 16, issue 1, 1977, Pages 47~53
Bacterial diseases of soybean has been recognized as a limiting factor of soybean production in Korea as it was estimated to cause around 10 percent of yield losses annually. The purpose of the study is to obtain information on the diseases through proving the kinds of pathogens and epidemiology, The wire brush method and multineedle appeared to be the best way of inoculation under all circumstances. Wire brush method, especially, was effective in shortening the incubation period and manifesting the lesion development by introducing more inoculum per unit of area. In case of spray inoculation it was necessary to apply a small amount(1 : 1,000) of wetting agent, twin-20, otherwise it was unabled to produce the diseases under field conditions. Two kinds of bacterial diseases caused by Pseudomonas glycinea and Xanthomonas phaseoli var. sljense were found from surveyed areas in Kore. Wild fire disease on soybean caused by Pseudomonas tabaci had not detectable during the experiment although there were several reports on the disease from other countries. when the pathogens were introduced into sterile soil, bacterial leaf blight pathogen could exsisted until 30 days while bacterial pustule pathogen survived only 4 days under the natural conditions of later June. Both bacteria, however, could produce the disease after more than 10 months period of storage in refrigerator when they were exsisted in infected plant tissues. In warehouse, non-temperature controlled, the bacteria lose their infectability within 6 months period from October to April even though they exsisted in infected tissues. Surface infested seeds with the pathogens could not produced the diseases on seedling stages of soybean plants when the seeds were planted in sterile soil after inoculation by dipping the seeds into bacterial suspensions, although germination was depressed by the pathogens when the seeds were planted on agar media.
Effect of Post-harvest Temperature on Potato Piece Rot in Relation to Suberin and Periderm Development
Lee Chang Un ;
Korean journal of applied entomology, volume 16, issue 1, 1977, Pages 55~63
As the important pathogens of potato storage diseases, Fusarium solani, F. reseum, F. oxysporum, and Erwinia carotovora were isolated from rot potato tubers. The cut potato pieces of the three cultivars, Epicure, Irish Cobbler, and Superior were held in moist chambers of
and 7 days and then rated for suberin and periderm development. The cut potato pieces thus treated were inoculated with the four organisms and held at
for 9 days and then rated for decay. As the temperature and period of holding increased, more suberin and periderm were developed with decrease in decay. Although there were differences in pathogenicity of the organisms, varietal reaction and protective barrier development, the effect of temperature and holding period had greater importance for decay prevention. At
within 7 days of holding period the potato pieces developed no protective barrier with severe decay. It is required to avoid placing cut potatoes directly in cold storage of the low temperature. At
the pieces developed abundant protective barriers even though decay occurred in somecases. Practically no decay was found with moderate protective barrier development after 3 days and 5 days at
, respectively. Since the potato pieces decayed occasionally during the holding period when they were held at the higher temperature, the holding at
for longer than 5 days is considered to be feasible for prevention of storage rots.
Studies on Purification and Serology of Rice Dwarf Virus
Lee Soon Hyung ; Lee Key Woon ; Chung Bong Jo ; Halliwell R. H. ;
Korean journal of applied entomology, volume 16, issue 1, 1977, Pages 65~67
Yield losses from rice dwarf virus infection are significant in Korea. Rice dwarf virus(RDV) was purified and RDV-antiserum was produced. The purified virus, mixed with an adjuvant(1:1) was injected every 10 to 14 days into rabbits. Three injections .were sufficient to produce an antiserum of 1/4,096 titer. The produced antisera will be used to facilitate the detection and identification of RDV in rice plants and in the RDV leafhopper vectors