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Hark Orchideen - Competence in Orchids  
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Biology Major aphid species Damage Control Biological plant protection
Aphids (Aphididae)
Aphids are winged or wingless insects of 1.0-4.0 mm in size with long legs and antennae. Their development happens in different cycles, it is often complicated and should not be described in detail here. In greenhouses there is often virgin birth (parthenogenesis), the females regularly produce new insects without being fecundated. This results in high reproductivity, usually there are infestive nests with high population density. Mainly young sprouts and soft leaves are infested. The appearance of the aphids shows some significant features. The sucking beak is bent backwards in its resting position and is below the body. At the back laterally there are so-called siphuncles which discharge a secretion. Between these parts there is a little tail called the cauda. The cauda and siphuncles are very important to determine the different species. All aphids on orchids are phloem suckers, so there is considerable formation of honeydew. Aphid infestation might result in virus transmission, some species are probably vectors for the Short Orchid Rhabdovirus (KORV).
  Hark-Orchideen - Competence in Orchids