Aphids

Aphids are small sap-sucking insects in the family Aphididae. Common names include greenfly and blackfly, although individuals within a species can vary widely in color. The group includes the fluffy white woolly aphids. A typical life cycle involves flightless females giving live birth to female nymphs—who may also be already pregnant, an adaptation scientists call telescoping generations—without the involvement of males. Maturing rapidly, females breed profusely so that the number of these insects multiplies quickly. Winged females may develop later in the season, allowing the insects to col

The Aphididae are a very large insect family in the aphid superfamily (Aphidoidea), of the order Hemiptera. These insects suck the sap from plant leaves. Several thousand species are placed in this family, many of which are considered plant/crop pests. They are the family of insects containing most plant virus vectors (around 200 known) with the green peach aphid (Myzus persicae) being one of the most prevalent and indiscriminate carriers.

species of bacterium

thumb|right|200px|Aphid excreting defensive fluid from the cornicles thumb|Cornicles The cornicle (or siphuncule) is one of a pair of small upright backward-pointing tubes found on the dorsal side of the fifth or sixth abdominal segments of aphids. They are sometimes mistaken for cerci. They are no more than pores in some species.