Previous - Next
In order to closely monitor the results of the campaign, it is expedient to conduct the first release at a readily accessible site. A common method of release is to artificially infest an untreated maize store with P.t., and then release the predator there once the insect pest (P.t.) population has become established. However, studies in Togo indicate that T.n. dispersion is more rapid when released in the field. The most opportune time for this is around midday (between 12 noon and 2 p.m.), when the flight activity of the beetles is most pronounced. If at least 2,000 individuals are released, it is highly likely that the predator will become established. Further technical details on release are given in the GTZ's "Recommendations" referred to above.
Monitoring of first releases in Togo demonstrated that the predator disperses self-reliantly under field conditions, populating P.t.-infested maize stores. Furthermore, as with P.t., dispersion is further promoted by maize transport. Repeated release at various sites accelerates dispersion.