Cotton aphid
reduce yield. Plant sap is rich in sugars, but has a low protein content. Aphids therefore need to extract large quantities of sap to get sufficient protein [...] As a result, the plant’s growth is retarded giving rise to deformed leaves or, if the infestation occurs early enough in the season, the death of young [...] great variety in colour. In greenhouses reproduction takes place by parthenogenesis, with unfertilized viviparous females continuing to produce new generations