ネギの連作障害における土壌消毒剤と対抗植物を組み合わせたサツマイモネコブセンチュウの防除法(作物保護)  [in Japanese] Development of the Protection System Combined with Soil Disinfection and an Antagonistic Plant Against Injury by Continuous Cropping of Japanese Bunching Onion by Meloidogyne incognita(Disease & Pest Management)  [in Japanese]

サツマイモネコブセンチュウによるネギ連作障害における土壌消毒剤と対抗植物を組み合わせた4年サイクルの防除法を確立した.1作目は,薬剤処理(クロルピクリン+1,3-ジクロロプロペン剤,ダゾメット剤およびオキサミル剤)でサツマイモネコブセンチュウの密度が減少し,ネギの増収が認められた.防除効果は,土壌消毒剤(クロルピクリン+1,3-ジクロロプロペン剤およびダゾメット剤)で高かった.土壌消毒剤の防除効果は,処理後2作目まで認められた.3作目にマメ科の対抗植物Crotalaria spectabilisの栽培でサツマイモネコブセンチュウの密度が抑制され,次作のネギは多収となった.本試験で実施した4年サイクルの体系は,土壌消毒剤と対抗植物を組み合わせることで,対抗植物の作付けによる収益面での問題を最小限に抑え,土壌消毒剤を多投しないサツマイモネコブセンチュウの防除法であり,ネギでの安定多収に有効な技術であると考えられる.

We established a four-year management system that decreased the population of Meloidogyne incognita to avoid injury due to continuous cropping of Japanese bunching onion by combination with soil disinfection and an antagonistic plant. In the first year, chemical treatments (chloropicrin+1,3-dichloropropene, dazomet and oxamyl) were added to the soil before cultivation, the population of root-knot nematodes decreased after these treatments, resulting in an increased yield of Japanese bunching onion. Soil disinfections (chloropicrin+1,3-dichloropropene and dazomet) had a higher effect on decreasing the population of root-knot nematodes. Positive effects of soil disinfection persisted for two years. In the third year, a leguminous antagonistic plant Crotalaria spectabilis was planted. There after, the population of root-knot nematodes greatly decreased, so the yield of Japanese bunching onion recovered the next year. The four years management system with soil disinfection and growth of an antagonistic plant crop was shown to be effective for reducing economic loss and the times of soil disinfection. This system should contribute to maintaining stable production of Japanese bunching onions.