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- Title
First release of Teretriosoma nigrescens Lewis (Col., Histeridae), the predator of Prostephanus truncatus (Horn) (Col. Bostrichidae), and follow-up investigations in southern Togo.
- Authors
Richter, J.; Biliwa, A.; Helbig, J.; Henning-Helbig, S.
- Abstract
The predator Teretriosoma nigrescens Lewis was released in southern Togo for the first time in 1991. Followup storage trials were carried out after this first release of the predator in order to investigate effects on its prey, the storage pest Prostephanus truncatus (Horn), in maize stores. Two trials were installed in the same villages (Tsagba as release village and Dafo as control), one in the storage season 1990/91 and the other in 1992/93. A third trial was set up in Morétan (release village) and Akaba (control) in 1993 together with the second release of T. nigrescens. The storage period lasted 8 months with sampling every 2 months. The number of P. truncatus was reduced by 56.4% in stores with presence of T. nigrescens as compared to the control after 8 months of storage in 1990/91. Damage and losses of stored maize cobs were 40.7% and 47.4% smaller than without the predator. One year after the release, larger numbers of the predator were observed in stores. Again, P. truncatus was reduced by T. nigrescens, but this was not as visible as before. In the third trial in Morétan, 1993, shortly after the second release of T. nigrescens, again a decrease of numbers of the Larger Grain Borer was observed in stores after 8 months of storage, together with a reduction of damage and losses.
- Subjects
TOGO; HISTERIDAE; PREDATORY insects; CORN diseases; BOSTRICHIDAE; FOLLOW-up studies (Medicine); ENTOMOLOGY
- Publication
Journal of Applied Entomology, 1998, Vol 122, Issue 1-5, p383
- ISSN
0931-2048
- Publication type
Article
- DOI
10.1111/j.1439-0418.1998.tb01516.x