Abstract The damage to citrus species by white-spotted longicorn beetles (Anoplo-phora maculata Thomson) was correlated with the growth vigor of the trees, and declined trees tended to be damaged by the insects. In early May, 40.64% Furadan (F. P. diluted with 100-fold water) was sprayed on the trunks, and larvae of the beetles in the trunks were investigated from mid to late July. The decision coefficients (R2) between the fraction of injured trees and the rating of growth vigor were between 0.944 and 0.623 for various species of citrus.
摘要 根據在嘉義農業試驗分所柑桔類果園的調查，發現星天牛的危害與柑橘植株之樹勢有關，樹勢愈衰弱者，被害植株的比率愈高，被害株之蟲數也有漸增的趨勢。經迴歸分析樹勢與受害株百分率之決定係數(R2)，在不同柑橘種類介於0.944與0.623間。
| Key words: Citrus, Anoplophora maculata, growth vigor, damage. | | 關鍵詞: 柑橘、樹勢、星天牛、為害。 |
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