Search results
Results From The WOW.Com Content Network
Aphids have a tail-like protrusion called a cauda above their rectal apertures. [12] [30] They have lost their Malpighian tubules. [31] When host plant quality becomes poor or conditions become crowded, some aphid species produce winged offspring that can disperse to other food sources. The mouthparts or eyes can be small or missing in some ...
Winged aphids can then colonize other host plants. Pea aphids also show hereditary body color variations of green or red/pink. The green morphs are generally more frequent in natural populations. [8] Acyrthosiphon pisum is a rather large aphid whose body can reach 4 millimetres (5 ⁄ 32 in) in adults. [8]
Euceraphis betulae, the birch aphid or silver birch aphid, is a species of aphid in the order Hemiptera.It is a tiny green insect with a soft body and wings. It is found living on the European silver birch tree (Betula pendula) where it feeds and multiplies on the buds and leaves by sucking sap.
When populations build up, winged individuals are produced and fly off to infest new host plants. The production of winged individuals is also dependent on the day length, the temperature, the parent type (winged or wingless) and the generation. [7] The aphids migrate back to primary hosts in August and overwinter as eggs on weeds.
Woolly aphids on crab apple bark. Pemphigus gall on cottonwood tree Grylloprociphilus imbricator on Fagus Galls made by Melaphis rhois. Woolly aphids (subfamily: Eriosomatinae) are sap-sucking insects that produce a filamentous waxy white covering which resembles cotton or wool. The adults are winged and move to new locations where they lay egg ...
Eggs are laid at the base of the host plant and these hatch in the spring. Winged forms are produced after three generations and these winged aphids then move on to other plants. [4] In the autumn the aphids move on to the seed pods of the host plant. [4] Like most aphids, M. viciae is viviparous. [4]
Winged females leave the gall in late summer and fly to moss, where they establish asexually reproducing colonies. The colonies produce the males and sexual females responsible for recolonizing sumac each spring." [3]: 758 In 1989, it was reported that the use of alternate plant hosts by the aphids dates from 48 million years before present. [6]
Macrosiphum rosae, the rose aphid, is a species of sap-sucking aphids in the subfamily Aphidinae. [1] [2] They have a world-wide distribution and infest rosebushes as the main host in spring and early summer, congregating on the tips of shoots and around new buds. Later in the summer, winged forms move to other rose bushes, or to a limited ...