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Volume 16 (1987)
- Issue 2 Pages 133-
- Issue 1 Pages 5-
- Issue supplement2 Pag･･･
- Issue supplement1 Pag･･･
Volume 16, Issue 2
Displaying 1-10 of 10 articles from this issue
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Tadashi KIMURA, Akira MISAWA, Tadashi OCHIAI, Satoshi ITO1987 Volume 16 Issue 2 Pages 133-136
Published: December 25, 1987
Released on J-STAGE: June 08, 2010
JOURNAL FREE ACCESSWe investigated the effects of water holding materials made of synthetic resin for Common Bermudagrass, with the object of revegetation in drylands. The summuried results of the investigation were as follows; Owing to add water holding materia is to the soil, the germination rate incre ased in the germination tests. These effects were more conspicuous in condition that the high rate of water holding materials were added by higher rate to the soil. Though capacity and durability of the water holding materials decreased under condition of sprinkling with salt water. Salts usually accumulate in the soil of drylands. Therefore we must consider the deterioration of capacity and durability of the water holding materials in case of using them in drylands.View full abstractDownload PDF (555K) -
Yoshikazu FUKUNAGA, Hiroyuki YAMAJI1987 Volume 16 Issue 2 Pages 137-140
Published: December 25, 1987
Released on J-STAGE: June 08, 2010
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Mitsuo KONDO, Hideki MASUYAMA, Tomoo OZAWA1987 Volume 16 Issue 2 Pages 141-146
Published: December 25, 1987
Released on J-STAGE: June 08, 2010
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Hiroyuki TANPO, Kazunobu MINATO, Toshikazu TANI1987 Volume 16 Issue 2 Pages 147-153
Published: December 25, 1987
Released on J-STAGE: June 08, 2010
JOURNAL FREE ACCESSIt is practically difficult to examine the chemical control of Pytium diseases on bentgrass golf greens, because the occurrence of the diseases is uncertain depending on climatic conditions. In this study, therefore, laboratory tests were conducted for the evaluation of fugicides selectively effective to Phycomycetes.
(1) Inhibition of mycelial growth and oospore formation was observed on corn meal agar plates containing six fungicides. The most effective chemicals on mycelial growth were metalaxyl and hydroxyisoxazole for Pythium aphanidermatum and were metalaxyl for P. vanterpoolii (ED50≤1.0ppm) . Oospore formation of both fungi was inhibited to 50% by metaxyl and hydroxyisoxazole at concentrations of 0.2 to 1.3 ppm, respectively.
(2) Chemicals were sprayed onto sods of bentgrass (Agrostis palustris), and 5 days after a piece of mycelial mats was placed at the center of sods. Of six fungicides used, metalaxyl (80mg/m2) and fosetyl-Al (2.0g/m2) were highly effective on the disease development by P. aphanidermatum and P. vanterpoolii, respectively. Chloroneb and hydroxyisoxazole were also effective on both sods inoculated with P. aphanidermatum and P. vanterpoolii. Propamocarb seemed to be effective only to the disease by P. aphanidermatum. The tests with five chemicals mixed with non-selective fungicides confirmed high effectiveness of metalaxyl. Non-selective fungicides did not seem to enhance the activity of selective fungicides.View full abstractDownload PDF (703K) -
Masayoshi HATSUKADE, Hideaki NAKANISHI1987 Volume 16 Issue 2 Pages 154-160
Published: December 25, 1987
Released on J-STAGE: June 08, 2010
JOURNAL FREE ACCESSTo obtain the useful informations for control of Anomala octiescostata Burmeister, flight behavior and food habit of this beetle were conducted by the field investigation in a golf course.
(1) This beetle was diurnal, and flied in a swarm over the turfgrass from 7: 00 to 11: 00 AM on a fine day, late in April. Researching the relation between the flight of this beetle and air temperature, illumination degree, it seemed that the illumination degree more than 30, 000lux was needed for the flight, and the air temperature more than 23°C inhibited their flight. The adults flying in a swarm over the turfgrass were almost all the males. It was guessed that the purpose of their flight was the search for the copulatory females.
(2) Sex ratio of the adults was examined by collecting from the turfgrass (40×40×20cm) of an infested fairway. The ratio of the females increased as soon as the adult swarming took place in the morning, because many adult males for the swarming emergenced from the turfgrass. But the sex ratio of this beetle showed about 1: 1 after the swarming.
(3) Copulatory behavior frequently took place on the turfgrass in the morning when this beetle flied in a swarm, and the phenomenon that many adult males gathered to only one female in crowds as a ball was observed at that time.
(4) The adult was a polyphagy insect, and fed 24 species of plants in 14 families in a golf course. Particulary, they gathered and fed on Rhododendron sp. (azalea), Artemisia vulgaris (nugwort), Symplocos chinensis, Quercus acutissima (a kind of oak) .
(5) It is to be desired that the optimum timing for control of this beetles is between 7: 00 and 11: 00 AM on a fine day from 20 to 30th April. Chemical insecticides should be applied to the infested fairway where the swarming was occuring.View full abstractDownload PDF (3958K) -
Yasutomo TAKEUCHI, Koichi YONEYAMA, Makoto KONNAI, Tetsuo TAKEMATSU1987 Volume 16 Issue 2 Pages 161-167
Published: December 25, 1987
Released on J-STAGE: June 08, 2010
JOURNAL FREE ACCESS1. Aqua-Gro, a soil permeation agent, promoted the downward movement of the applied retardants, such as EL 500, PP 333 and S 3307 in soil.
2. In the case of PP 333, the increase in the movement in soil was larger in the drier soil than in the wet soil.
3. In the model experiments on soil adsorption and desorption of the retardants, it was found that, in the case of EL 500, 0.1% Aqua-Gro decreased the adsorption to less than 90% and increased the desorption by more than 16%. With PP 333, 0.2% Aqua-Gro decreased the adsorption to less than 53% and increased the desorption by more han 29%.
4. Addition of Aqua-Gro (20 μl) to the EL 500 and the PP 333 solutions increased their water solubilities to 131% and 180 %, respectively.View full abstractDownload PDF (566K) -
Tetsuo TAKEMATSU, Makoto KONNAI, Masaru OGASAWARA, Kiyoshi SUZUKI, Yas ...1987 Volume 16 Issue 2 Pages 168-173
Published: December 25, 1987
Released on J-STAGE: June 08, 2010
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Sachio KAWAKAMI1987 Volume 16 Issue 2 Pages 174-180
Published: December 25, 1987
Released on J-STAGE: June 08, 2010
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Mitsuo KONDO1987 Volume 16 Issue 2 Pages 181-188
Published: December 25, 1987
Released on J-STAGE: June 08, 2010
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Tsuneo MIKAMI1987 Volume 16 Issue 2 Pages 189-194
Published: December 25, 1987
Released on J-STAGE: June 08, 2010
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