桑介殼蟲(Pseudaulacaspis pentagona Targ.-Tozz.)及梨圓介殼蟲(Quadraspidiotus perniciosus Comstock) (Homoptera : Diaspidae)皆是為害果樹及觀賞樹木的重要害蟲。本試驗目的在比較夏油與數種慣用的殺蟲劑，對上述兩種盾介殼蟲的防治效果。針對桃樹的桑介殼蟲及梨樹的梨圓介殼蟲分別進行試驗。結果顯示，夏油乳劑能有效控制桑介殼蟲及梨圓介殼蟲的族群，且防治效果明顯優於其他數種殺蟲劑。然而，夏油施用後會對於桃樹花苞、葉片及幼嫩枝條產生藥害，宜推薦作為落葉果樹萌芽期前的防治藥劑，至於滅大松乳劑則適用於植株生長期。

關鍵字：夏油、桑介殼蟲、梨圓介殼蟲、防治。

　　White peach scale (Pseudaulacaspis pentagona Targ.-Tozz.) and San Jose scale (Quadraspidiotus perniciosus Comstock) (Homoptera : Diaspidae) are two important insect pests of fruit and ornamental trees. The effectiveness of summer oil and various practical insecticides were evaluated under field conditions. White peach scale was examined on peach trees and San Jose scale was examined on pear trees. The populations of white peach scale and San Jose scale were successfully control by summer oil, which revealed a significantly difference with other insecticides, respectively. However, summer oil may be harmful the flower bud, leaves and young branch of plants. Therefore, summer oil should be applied at dormancy of deciduous hosts, before the sprout period. As regards methidathion was used at growth stage.

Key words: summer oil, Pseudaulacaspis pentagona, Quadraspidiotus perniciosus, control.