A really good biological solution to termites is nematodes.
Steinernematids and Heterorhabditids kill termites. Due to their phoretic relationship with a specialized bacterium, their insect hosts are killed, in general, within hours or days after they invade the host's bodies. The amount of time between the EPN's invasion and death of the host varies according to environmental constraints such as, in particular, temperature. At only a few degrees above freezing, for example, host morbidity and death may not ensue for weeks, while at room temperature the typical infection is lethal in 48 hours or less.
The effect of an attack by Steinernematids and Heterorhabditids on their insect hosts has been likened to that of a "guided missile" (Akhurst, R. J., 1993. "Bacterial symbionts of entomopathogenic nematodes", CSIRO Publications, East Melbourne). Immediately after entering the insect, the EPN disgorge their phoretic bacteria "warheads", which multiply and produce (1) a toxin that kills the host, and (2) antibiotics that preserve the host's cadaver. The EPN feed on the bacteria and use the host's cadaver as an incubation chamber in which to produce multiple infective juveniles, or IJ's. Eventually the EPN IJ's emerge to search for new hosts.
Nematodes are avaialbe on fine organic garden and farm sites like mine
