Aphids
of which is much larger than the other. For a large part of the season an aphid population consists of viviparous females. As reproduction is asexual, [...] the progeny of a single female is genetically identical to the mother. In other words, they are clones. Because there is no genetic recombination, different [...] by the winged individuals. Potato virus Y (PVY) is transmitted by aphids in tomato in this way, as is the cucumber mosaic virus (CMV) in cucumber. How