研究のタイプ: 医学/生物学の研究 (experimental study)

[ヤシの幹の角材サンプル中のヤシオオオサゾウムシ駆除のための導波管照射チャンバ] med./bio.

A waveguide irradiation chamber for destruction of red palm weevils (Rhynchophorus ferrugineus) inside a block sample of a palm tree trunk.

掲載誌: J Microw Power Electromagn Energy 2003; 38 (2): 137-146

この研究は、ヤシの木の幹の内部に巣食うヤシオオオサゾウムシ(red palm weevil:RPW)の駆除法としてのマイクロ波の有用性を検討した。実験のために作成した2.45 GHzの方形導波管照射チャンバーは、その一側面を取り外し可能にし、ヤシの幹の角材サンプルの挿入を容易にした一方、金属壁の連続性は確保されていた。サンプルの温度上昇は、導波管壁の1つに沿って異なる位置に開けられた穴から挿入した熱電対によって監視された。その結果、健康な幹の角材サンプルの先端から2〜3 cm以下の位置に置かれたRPWサンプルの致死率は100 %であった;感染したブロックサンプルの場合には、その位置は先端から4〜5 cmの距離であった;幹の角材サンプルの先端ではマイクロ波エネルギーの吸収が高いため、この領域でホットスポットが観察された、と報告している。

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研究目的(著者による)

Irradiation of red palm weevils at the larvae stage inside samples of tree trunks (of healthy and infected palms) at different moisture content levels in order to assess the possibility of utilizing a microwave irradiation technique for practical control of red palm weevils. Design details of the irradiation chamber, techniques followed and the results obtained are presented.

詳細情報

The date palm is the most cultivated plant in the Arabian peninsula and North Africa. The existence of these palms and their multimillion dollar date industry are threatened by a pest known as red palm weevil.
Red palm weevils were inserted at different positions along the centerline of block samples of healthy and infected tree trunks.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 2.45 GHz
ばく露時間: 5 min, 10 min, 15 min, 20 min, 25 min, 30 min, 35 min, 45 min and 55 min without red palm weevil (RPW); 1.2 min and 40 s with RPW
  • 電力: 700 W (maximum output power of the generators)

ばく露1

主たる特性
周波数 2.45 GHz
特性
  • guided field
ばく露時間 5 min, 10 min, 15 min, 20 min, 25 min, 30 min, 35 min, 45 min and 55 min without red palm weevil (RPW); 1.2 min and 40 s with RPW
Additional information Reference article: Ali, IA and Al-Jabr 2002. A slotted waveguide radiator for microwave irradiation of multiple samples of RPWs. Submitted for publication Jr. Microwave Power and Electromagnetic Energy
ばく露装置
ばく露の発生源/構造
  • rectangular waveguide section TE10, 8 x 4 cm² cross-section, 10 cm length
ばく露装置の詳細 The first microwave irradiation period (1.2 min) is for a red palm weevil sample at distance of 3 cm from the leading edge along the central axis. The second microwave irradiation period (40 s) is for a loose sample of an infected tree trunk and a sample of a red palm weevil (larve stage). The whole measurement area was covered with microwave absorbing material.
パラメータ
測定量 種別 Method Mass 備考
電力 700 W - 備考を参照のこと。 - maximum output power of the generators

ばく露を受けた生物:

方法 影響評価項目/測定パラメータ/方法

研究対象とした生物試料:
調査の時期:
  • ばく露後

研究の主なアウトカム(著者による)

The chamber consists of an aluminium rectangular waveguide with one of its broad sides removed for easy insertion of the block samples of the tree trunk. A rectangular aluminum plate, with the same dimensions as the removed wall section was made to slide-in and cover the tree block sample after its insertion in the waveguide to insure continuity of metallic walls.
Data showed that 100% mortality rate could be obtained with the red palm weevils samples at distances not more than 2-3 cm from the irradiation leading edge of healthy tree block samples and 4-5 cm from leading edge of infected samples. Hot spots were revealed at the leading edge of the tree samples due to high absorption of microwave at these regions.
The data show that only red palm weevils near the outer surface of the palm tree trunk can be efficiently irradiated at 2.45 GHz due to the limited penetration depth at this particular frequency.

研究の種別:

研究助成