以樹幹注射法防治老樹之刺桐釉小蜂

A Preliminary Study of Controlling Quadrastichus erythrinae Kim on Heritage Coral Trees with Trunk Injection

王庭碩(Ting-Shuo Wang) ； 董景生(Gene-Sheng Tung) ； 楊恩誠(En-Cheng Yang) ； 楊曼妙(Man-Miao Yang)

《台灣昆蟲》 31卷3期 (2011/09) Pp. 281-286

https://doi.org/10.6661/TESFE.2011018

摘要

台灣地區刺桐屬植物近年來受到入侵造癭害蟲－刺桐釉小蜂(Quadrastichus erythrinae Kim)的雌蟲產卵刺激，產生大量蟲癭，影響植株養分運輸，進而對刺桐的生長造成嚴重威脅。許多原生刺桐老樹樹勢較弱，更成為刺桐釉小蜂感染的主要對象，甚至導致死亡。目前美國針對釉小蜂所發展的樹幹注射法為防治刺桐釉小蜂較有效方法之一，但在老樹應用上其防治效果與藥劑持續性仍屬未知。為了降低刺桐釉小蜂對台灣本土刺桐(Erythrina variegata)的危害，並證明應用樹幹注射法在原生種刺桐老樹上的防治成效，本研究以改良式的樹幹注射法防治老樹上的刺桐釉小蜂，並建立樹幹藥劑注射之標準流程。藉由監測老樹受刺桐釉小蜂危害的期數，發現樹幹藥劑注射後釉小蜂危害期數皆顯著降低，且藥劑效力可維持半年以上。由此結果得知，利用改良式樹幹藥劑注射法在老樹之刺桐釉小蜂防治具有良好成效。

關鍵字

刺桐釉小蜂 ； 樹幹注射法 ； 益達胺

並列摘要

In last few years, an invasive galling wasp, Quadrastichus erythrinae Kim, has caused severe damage to the native coral trees in Taiwan. The wasp induces gall formation of coral trees by laying eggs into new shoots. Then soon, the infected trees (especially heritage trees) become weak and even lead to death. At present, trunk injection is considered as one of the most effective methods for controlling Q. erythrinae. However, the effectiveness and persistence of the insecticide applied by trunk injection on native heritage trees is still unavailable. Thus, the major goal of this study is using improved trunk injection method to control Q. erythrinae on heritage native coral trees, as well as establishing a standard operating protocol for the trunk injection. The results reveal that the damage stages of elder trees had dropped down immediately after injection, and maintain low damage stage for more than half year. Controlling Q. erythrinae with the improved trunk injection shows positive effect on heritage coral trees, suggesting that the developed protocol can be applied for the pest control in the field.

並列關鍵字

Quadrastichus erythrinae ； trunk injection ； imidacloprid