Field Control of Paulownia Witches' Broom with Oxytetracycline Hydrochloride

옥시테트라사이클린에 의(依)한 오동나무·빗자루병(病) 방제(防除)

  • 라용준 (서울대학교 농과대학 농생물학과) ;
  • 신현동 (서울대학교 농과대학 농생물학과)
  • Received : 1980.11.20
  • Published : 1980.11.30

Abstract

The witches' broom disease of Paulownia tomentosa (Thunb.) Steud with which mycoplasmalike organisms are associated is widespread throughout Korea and poses serious threat to the cultivation of paulownia. Attempt was made to investigate the feasibility of field control of the disease with oxytetracycline hydrochloride (OTC). A total of 84 paulownia trees (6 year-old, DBH: 10-15cm) exhibiting severe symptoms of witches' broom were selected and treated during March to September. Solution of 1-10g of OTC dissolved in 0.1­2.0 of water was transfused into infected trees with gravity flow method from a dark-brown colored plastic reservoir (11 volume) through plastic tubes (1.2m long) connected to 2-4 holes (5 mm in diameter and 4-5cm in depth) bored in the basal part of the tree trunks (Fig. 1 and 2). Of 60 diseased paulownia trees injected with 2g of OTC in 0.1-2.0l of water during May to September, 1979, 58 trees resulted in complete remission of symptom development and resumption of healthy new growth at least up to September, 1980 when the last observation of the effect of OTC treatment for this experiment was made. The rest of two trees were dead probably due to too severe infection. Of 24 paulownia trees treated in March and April, 1979 complete remission of symptom development was obtained with 8 trees, and nine trees were partially prevented from symptom development in the following season. The remaining 7 trees were dead due to failure in uptake of OTC and partly because the trees were in too far advanced stage of infection. Application of highly concentrated solution of 2g of OTC dissolved in 0.1-0.2l of water per tree was just as effective as the 2g/1-2l treatment. Injection of 2g/1-2l required 3-4 days while treatment of 2g/0.1-0.2l reduced the time for injecting one tree down to less than 24 hrs. The result of this experiment demonstrates that basal trunk injection of 2g OTC/0.1-0.2l/tree is feasible for field control of paulownia witches' broom, provided that tree injection is performed in actively growing season (May-September) and at the initial stage of disease development.

오동나무 빗자루병(病)을 방제(防除)할 목적(目的)으로 병(病)든 오동나무 (6년생(年生), 흉고직경(胸高直径) 10~15cm)에 Oxytetracycline HCl을 수간주입(樹幹注入)하여 다음과 같은 결과(結果)를 얻었다. 1. 1979년(年) 5월(月)~9월(月)에 Oxytetracycline HCl 2g/0.1~2.0l를 수간주입(樹幹注入)한 결과(結果) 1980년(年) 9월(月) 현재(現在) 처리(処理)한 모든 나무에서 병징(病徵)이 억제(柳制)되고 수세(樹勢)가 회복(回復)되어 정상적(正常的)인 생육(生育)을 하였다. 2. 수간주입(樹幹注入)은 수액이동(樹液移動)이 활발(活溌)한 5~9월(月)에 실시(實施)하는 것이 방제효과(防除效果)가 좋았으며. 3~4월(月)에 실시(實施)한 것은 방제효과(防除效果)가 떨어졌다. 3. Oxytetracycline HCl의 저농도대량주입(低濃度大量注入) (2g/l~2l)과 고농도소량주입(高濃度小量注入) (2g /0.1~0.2l) 간(間)에는 방제효과면(防除效果面)에서 차이(差異)가 없었으며, 고농도소량주입(高濃度小量注入)에 소요(所要)되는 시간(時間)은 24시간(時間) 내외(內外)인데 비(比)해 저농도대량주입(低濃度大量注入)은 3~4일(日)이 소요(所要)되었다.

Keywords

Acknowledgement

Supported by : 산업협동재단