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Thus, aphids show very complex and rapidly changing within-year dynamics, with each clone going through several generations during the vegetative season and being made up of many individuals, which can be widely scattered in space. The survival of the eggs and/or overwintering aphids determines the numbers of aphids present the following spring ...
Some plant varieties are more resistant to attack than others. In a study on tomatoes, it was shown that the aphids preferred smooth to hairy leaves and that susceptible tomato plants had higher sucrose , lower quinic acid and higher alanine and tyrosine levels. [ 10 ]
The life cycle of some species involves an alternation between two species of host plants, for example between an annual crop and a woody plant. Some species feed on only one type of plant, while others are generalists, colonizing many plant groups. About 5,000 species of aphid have been described, all included in the family Aphididae.
Aphis gossypii is a tiny insect, an aphid ("greenfly") in the superfamily Aphidoidea in the order Hemiptera.It is a true bug and sucks sap from plants. It is a widely distributed pest of a variety of agricultural crops in the families Cucurbitaceae, Rutaceae and Malvaceae. [2]
Aphidinae is an aphid subfamily in the family Aphididae.. Many species of aphids spread potyviruses and most are from the subfamily Aphidinae (genera Macrosiphum and Myzus).Most have alternative hosts, the primary host plant is usually a tree, and the secondary one is herbaceous.
Aphis is a genus of insects in the family Aphididae containing at least 600 species of aphids. [1] It includes many notorious agricultural pests , such as the soybean aphid Aphis glycines . Many species of Aphis , such as A. coreopsidis and A. fabae , are myrmecophiles , forming close associations with ants .
Rhopalosiphum is a genus of aphid of the family Aphididae that includes 17 species worldwide. [1] Apart from sucking the phloem of host plants and thereby being treated in agriculture as pests , some species are vectors for viral plant pathogens .
Telescoping generations can occur in parthenogenetic species, such as aphids or other life forms that have the ability to reproduce without ovum fertilization. [1] This occurrence is characterized by a viviparous female having a daughter growing inside her that is also parthenogenetically pregnant with a daughter cell.