Converse of subject

• transmit: In addition, strain HA 5-1 was only poorly transmitted by aphids.

Converse of object

• eat: These wasps then eat harmful cabbage aphids which may be feeding on the plants.

• kill: A natural fungus that grows on and kills Russian wheat aphid is winding its way toward commercial application.

• control: Prevent by controlling the aphids that carry the disease.

• include: Biology, identification and control of the major greenhouse pests including aphids, whitefly and mites.

Adjective modifier

• wooly: From Christine J, UK This could be wooly gray aphids.

• green: The Gaucho is no longer able to protect him and 3 small green aphids now lurk in his foliage.

• black: Every year, in the first really hot spell, the black bean aphid starts its regular invasion of the broad bean plants.

Modifies a noun

• infestation: The number of larvae needed to treat an aphid infestation will vary on the number of aphids present.

• predator: This is partly because of the presence of Cornish hedges and hedge bottoms which provide a habitat for natural aphid predators such as ladybirds.

• colony: Adults lay batches of up to 40 eggs close to an aphid colony.

• vector: The virus was transmitted by mechanical inoculation and also by the aphid vector Aphis gossypii.

• pest: Lab tests found that the potatoes killed off significant numbers of the aphid pests.

• transmission: Aphid transmission studies using Potato virus Y helper component proteins expressed from a Potato virus X vector.

Noun used with modifier

• peach-potato: Thus, in the event of climate warming we would expect all three species to make considerably earlier appearance, particularly the peach-potato aphid.

• spruce: Fieldwork is carried out at Radnor Forest in Wales, where Forestry Commission research into the green spruce aphid is already established.

• pea: However, pea aphids are known to feed on a much wider range of plant species.

• cabbage: These wasps then eat harmful cabbage aphids which may be feeding on the plants.

• willow: Figure 4: The giant willow aphid is also found in the USA.

• potato: The potatoes were genetically modified to include a toxin - GNA lectin - found in snowdrops to make them resistant to potato aphids.