エダマメ栽培における高地温と抵抗性ダイズによるダイズシストセンチュウの増殖抑制(作物保護)  [in Japanese] Control of Soybean Cyst Nematode (Heterodera glycines) in Vegetable Soybean Cultivation using a High Soil Temperature and Cultivation of the Resistant Cultivar, 'Peking'(Disease & Past Management)  [in Japanese]

高地温と抵抗性ダイズ'Peking'がエダマメ圃場のダイズシストセンチュウ増殖に与える効果を検討した.恒温器試験では, 地温が33℃の場合, 観音台圃場産のダイズシストセンチュウは増殖能力が著しく低かった.圃場ではエダマメ品種'富貴'と抵抗性大豆品種'Peking'を用い2000年から2003年まで黒, 白黒ダブル, 透明のマルチ区および無マルチ区を設け試験を行なった.2002年透明マルチ区で地温33℃以上の積算時間が207時間, 白黒ダブルマルチ区が95時間で, この時透明マルチ区の線虫増殖率は有意に低く, 翌年同じ試験区に栽培されたエダマメの莢重は透明マルチ区で有意に高かった.地温33℃以上の積算時間が200時間を超す場合, 圃場での増殖率が抑制されると考えられた.積算時間が短い場合の効果は明確には認められなかった.'Peking'を作付けすると増殖率が'富貴'作付けに比べ低下し, 密度抑制効果が増殖率の低下と次年度のエダマメの莢重増加によって確認された.

Effects of a high soil temperature using plastic mulch and cultivation of the resistant cultivar, 'Peking' on the population of soybean cyst nematode (Heterodera glycines) were investigated in the field and in an incubator with vegetable soybean (Edamame). Soybean cyst nematode eggs were inoculated into seedlings of the susceptible cultivar, 'Fuki', grown in incubators with soil temperatures of 25, 29 and 33℃. Soybean cyst nematode did not produce cysts containing eggs at a soil temperature of 33℃, although it did produce eggs at 25 and 29℃. In field experiments, susceptible 'Fuki' and the resistant soybean cultivar, 'Peking', were cultivated for about 3 months with or without plastic mulch. When the accumulated duration of soil temperature above 33℃ was 200 hr or longer, the egg reproduction ratio was significantly suppressed and edamame yield was high the following year. After 'Peking' cultivation, the egg number in the soil was significantly suppressed compared to that after 'Fuki', and edamame yield the following year was also high.