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矢尖蚧是对兰花危害最大的昆虫,主要寄生于兰花叶片上,背面较少些。矢尖蚧不仅吮吸兰花液汁,而且容易招致病害,虫体粘附在叶片上,严重影响光合作用。叶片受害处,轻则形成枯斑,重则整片死亡。形态特征及生活习性雌蚧壳箭头形,长3.5～4毫米,棕褐色。蚧壳背面呈屋脊形,有明显的纵脊,其两侧有许多向前斜生的横纹,形似草帽状。雄蚧壳较细小,长约1.2毫米,粉白色,背面有3条纵隆脊。每年发生2～3代,多与雌成虫越冬。阴暗潮湿不通风的养兰场所有助于矢尖蚧繁衍,各代若虫发生期为5月中下旬、7月中旬及10月中旬。每年5月中旬以后开始繁殖,交尾后的雌成虫产卵于介壳下母体的后方,卵经1～3天即孵化成若虫。若虫爬出介壳之后,活动能力很强,到处爬动,经过1～2天后固定下来,刺吸叶肉危害叶片,并
Agrimony scale is the most harmful insect on orchids, the main parasitic on the leaves of orchids, the back less. Agrimus not only suck orchid juice, but also easily lead to disease, parasites adhere to the leaves, seriously affecting photosynthesis. Damaged leaves, ranging from light to form a spot, while the whole piece died. Morphological characteristics and habits of female scale shell arrowhead shape, length 3.5 ~ 4 mm, brown. The scale shell on the back was ridged, with distinct longitudinal ridges. There were many horizontal stripes on both sides of the scale, which resembled straw hat. Male scale shell smaller, about 1.2 mm, white powder, the back of 3 vertical ridges. Occur each year 2 to 3 generations, more with female adults overwintering. Shady damp and non-ventilated site will help to promote Agrimony scale reproduction, nymphs of various generations occurred in late May, mid-July and mid-October. After mid-May each year to begin breeding, mating female adults spawn in the shell under the mother of the rear, the egg by 1 to 3 days that hatch into nymphs. After the nymph climbed out of the shell, the ability to move is very strong, crawling around and fixing it after 1 to 2 days, puncturing the leaf to harm the leaves and