カンキツリクビン（グリーニング病）の病徴発現に及ぼすペニシリンおよび２，３の抗生物質処理の影響

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  • Suppressive effect of penicillin and some other antibiotics on symptom development of citrus likubin (greening disease)
  • カンキツリクビン グリーニングビョウ ノ ビョウチョウ ハツゲン ニ オヨボス

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Buds of ponkan (Citrus reticulata Blanco) infected by likubin (citrus greening disease) were treated with penicillin, tetracycline, tylosine, streptomycin and cefaloridine by immersing in solutions for 24hr, and the treated buds were grafted on indicator ponkan seedlings for determining remained infectivity.<br>Likubin symptom development in indicator plants was completely suppressed when the infected buds were treated with very low concentration of tetracycline (12.5μg/ml). Penicillin and tylosine were also effective in suppressing likubin symptom development at concentrations higher than 200μg/ml, whereas streptomycin and cefaloridine were ineffective at considerably higher concentrations (500μg/ml).<br>Tetracycline was phytotoxic at higher concentrations (more than 250μg/ml) as indicated by no survival of the treated buds after grafting. Penicillin was not phytotoxic even when the buds were immersed in 2000μg/ml solution for 72hr.<br>The results support the hypothesis that the pathogen associated with likubin will be classified as a bacterium or a rickettsialike organism rather than as a mycoplasma.

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