I don't wanna flood my own thread with boring shit, but the Feeding Ecology section was equally as interesting, and I think I'm on the right track with the Bio-bugs aimed at root problems. These are the predators I need:Relations with Ants
Honeydew is the reason that ants are associated with aphids. In fact many species of ants are so addicted to this sweet drink that they will protect the aphids from various predators and move them to new plants if the one they are on starts to wilt. Some ants even go as far to build small shelters over species that feed near the base of the plant and or to keeping root-aphids inside their own nests. Lasius fuliginosus workers carry newly hatched fundatrices from the base of oak trees where they overwinter as eggs to new growing leaves at the top of the tree as soon as they are hatched. The common meadow ant Lasius flavus has a particularly close relationship with the root aphids it uses and even collects their eggs in the autumn and early winter and stores them in its nests, then in spring the eggs are moved to suitable chambers so that plant roots are available for them as soon as they hatch. In effect these ants treat the aphids as well as they treat their own brood. The interaction between Aphids and ants has been going for a long time and some ants are almost dependant on aphids for food while some aphids such as Protrama spp. are obligate myrmecophiles, and do not excrete honey-dew unless stimulated to do so by ants. Species of aphids which have intimate associations with ants, particularly those that live in their nests are of necessity monoecious. The aphid Paracletus cimiciformis is practically only found in the nests of Tetramorium caespitum where it is fed and cared for by the ants despite the fact that it rarely if ever secretes honey-dew, it is in fact a parasite and gains most of its food from the ants who offer it nectar.
The number of ants associated with a given species of aphid and the number of aphid species associated with a given species of ant varies from place to place, up to 17 different aphid species have been found in Lasius niger nests. Sometimes different ant species which live in similar habitats will foster different aphid species, i.e. Lasius niger with Anoecia corni and Lasius flavus with Anoecia nemoralis. However aphid species that have evolved close relationships with ants may have broader environmental tolerances than their hosts hence, the aphid Forda formicaria is attended by Lasius spp. in the lowlands and by Formica spp. in the highlands. Ants gain much nutrition from their relationships with aphids and the honey-dew excreted by aphids such as Aulacorthrum sp. can in some cases be a complete ant food. Generally the amount of proteins and amino acids in excreted in honey-dew varies between species and plant. However because ant attendance stimulates aphids to feed at a rate 2-3 times their normal rate, and because they do not grow at 2-3 times their normal rate, it follows that the reduction of nutrients resulting from aphid digestion is greatly lessened. Also as adult ants do not need proteins but only sugars honey-dew is a perfect food for them. Ants are not always good guys though, like us with cows, if aphid numbers build up the ants quite happily kill a few off and feed them to their larvae.
The protection that ants give the aphids they attend is not always excellent and varies depending on the type of predator or parasite. Generally speaking the ants are better at dealing with Ladybird larvae and Anthocorid bugs than they are at dealing with Lacewing larvae and Hoverfly larvae. They not only remove the larvae, sometimes killing them but also remove the eggs of hoverflies and Ladybirds. Interestingly by herding aphids onto the tops of the plants ants render them more vulnerable to attack from some parasites. In one experiment in 1958 R.C. Banks found that attended aphids were 10X more likely to be parasitised than unattended ones.
Haven't had a look for them yet but Scay says he couldn't find them online. :/Chloropidae, Thaumatomyia spp. larvae, specialise on root aphids.
Phoridae, Phora spp. larvae, specialise on root aphids.