翅胎生雌蚜 体长不到2毫米，身体有黄、青、深绿、暗绿等色。触角约为身体一半长。复眼暗红色。腹管黑青色，较短。尾片青色。有翅胎生蚜体长不到2毫米，体黄色、浅绿或深绿。触角比身体短。翅透明，中脉三岔。卵初产时橙黄色，6天后变为漆黑色，有光泽。卵产在越冬寄主的叶芽附近。无翅若蚜 与无翅胎生雌蚜相似，但体较小，腹部较瘦。有翅若蚜 形状同无翅若蚜，二龄出现翅芽，向两侧后方伸展，端半部灰黄色。
为害症状:
棉蚜以刺吸口器插入棉叶背面或嫩头部分组织吸食汁液，受害叶片向背面卷缩，叶表有蚜虫排泄的蜜露(油腻)，并往往滋生霉菌。棉花受害后植株矮小、叶片变小、叶数减少、根系缩短、现蕾推迟、蕾铃数减少、吐絮延迟。
Caption: Cotton aphid (Aphis gossypii) is most commonly associated with outbreaks on cotton in the Southeast. It has many generations per year and is often resistant to various classes of insecticides. It is also subject to heavy mortality via predation and parasitism (ladybugs and braconid wasps). Ants are commonly found associated with melon aphid but they are there to collect honeydew. It is also known as the melon aphid.
Magnification*: x16
Type: SEM
Keywords: 20494A.TIF 07.01.02 agricultural disease aphid Aphis gossypii cornicle cornicles cotton aphid insect insect vector insects invertebrate invertebrates melon aphid plant pathogen carrier virus carrier SEM |
*(Magnifications are based on a 35mm slide image of 24mm in the narrow dimension.)