トマトのサツマイモネコブセンチュウとトマト萎凋病菌の防除に及ぼすアミノ酸メチオニンと菌食性線虫 <i>Aphelenchus avenae</i> 処理の効果

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  • Efficacy of Methionine and the Fungivorous Nematode <i>Aphelenchus avenge</i> for Control of <i>Meloidogyne incognita</i> and <i>Fusarium oxysporum</i> f. sp. <i>lycopersici</i> on Tomato
  • トマト ノ サツマイモ ネコブセンチュウ ト トマトイチョウビョウキン ノ ボウジョ ニ オヨボス アミノサン メチオニン ト キンショクセイ センチュウ Aphelenchus avenae ショリ ノ コウカ

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Pot studies on the effects of methionine (Met) and fungivorous nematode, Aphelenchus avenge (Aa) on plant growth and pathogens' propagation in tomato-Meloidogyne incognita (Mi)-Fusarium oxysporum f. sp. lycopersici (Fo) pathosystem were carried out using a multi-factor factorial experiment design of 24. Regarding interactions between Met and Aa on pathogens' propagation and their damage to tomato plant, a synergistic effect was detected for final populations of Mi juvenile and an interference effect for Fo densities 49 days after planting, but there were no evident interactions for root-knot index or number of fallen leaves that were affected most by Fo treatments. Interactions between Met and Aa on tomato-growth-characters were evident for the dry root weight only but not for the shoot length, shoot weight, number of flowers or total fruit weight. Met as such significantly (p≥0.05) contributed to reduce the Mi juvenile population and root-knot index 70 days after planting and Fo densities for both 21 days and 49 days after planting. Fruit weight was significantly improved (p<0.05) by Met treatment when the soils were inoculated with Mi. Aa alone did not contribute significantly to the improvement of tomato growth, Fo and Mi control or root-knot index. Results led to the conclusion that the combined application of Met and Aa may be impractical for the simultaneous control of Mi and Fo on tomato.

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