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アセロラ栽培におけるネコブセンチュウ被害の防除技術を開発するため， 土壌に高電圧パルスを処理した． 試験は鉢栽培の幼木を用い， 2 か年にわたり2 回のネコブセンチュウ接種および10回の高電圧パルス処理（ 80 V，60 Hz（ 印加電圧10 kV）） を実施した． ネコブセンチュウ接種区と無接種区との間で， 樹体成長およびネコブ指数には差が認められなかった． 一方， 根の卵のう数および土壌中ネコブセンチュウ数は接種区で多かった． 高電圧パルス処理の頻度が高くなるほど， 卵のう数およびネコブセンチュウ数は減少し， 特に高電圧パルス10秒4 か所区の卵のう数は， ネコブセンチュウ接種・高電圧パルス無しよりも有意に少なかった． 以上から， アセロラ栽培において高電圧パルス処理は， 土壌中ネコブセンチュウの増殖抑制に効果がある可能性が明らかとなった．In order to develop a technique for reducing the damage caused by root-knot nematodes, high-voltage pulses treatment was applied to the soil in acerola cultivation. In the present study, young potted trees were inoculated with root-knot nematode twice and conducted ten high-voltage pulse treatments (80V, 60Hz(applied voltage 10kV)) over a two-year period. There was no difference in tree growth and root-knot index between the root-knot nematode inoculated plot and the non-inoculated plot. On the other hand, the number of root egg masses and the number of root-knot nematodes in soil were high in the inoculated plot. As the number of treatments of high-voltage pulse increased, the number of egg masses and root-knot nematodes decreased, and in particular, the number of egg masses in 10 seconds and 4 sections of the high-voltage pulse plot was significantly lower than that in without high-voltage pulse plot. Thus, it was clarified that high-voltage pulse treatment in acerola cultivation may be effective in suppressing the increase of root-knot nematodes in soil. |
