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康氏粉蚧在苹果树上为害枝干及果实 ,严重时被害率可达 2 0 %～ 30 %。康氏粉蚧在无袋栽培果园很少发生 ,而在套袋果园容易发生。康氏粉蚧吸食苹果枝干、幼芽、叶片、果实和根部汁液。嫩枝受害后肿胀 ,树皮纵裂而枯死。前期被害果成畸形 ,后期主要为害萼洼部位 ,产生许多褐色圆
Kang scale mealybug on the apple tree damage stems and fruits, serious damage rate of 20% to 30%. Cornish mealybugs rarely occur in bagless orchards and are prone to occur in bagged orchards. Cornish mealybugs inhabit the branches, shoots, leaves, fruits and roots of apple juice. Shoots after swelling swelling, bark longitudinal split and dead. Early victims of fruit into deformity, the latter part of the main damage calyx area, resulting in many brown circle