Abstract
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.
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Claims 7
Claim · model-written summary
Predator presence reduced P. truncatus numbers by 56.4% after eight months in 1990/91.
- Treatment
- presence of T. nigrescense0
- Interactor
- P. truncatus
Prostephanus truncatuse0pest - Second interactor
- T. nigrescensTeretrius nigrescense0biocontrol_agent
- Outcome
- number of P. truncatuse0
- Direction
- reducede0
- Value
- 56.4%e0
- Comparator
- the controle0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize stores”
e0“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”
Claim · model-written summary
Predator presence reduced damage to stored maize cobs by 40.7%.
- Organ / stage
- cobse0
- Treatment
- predatore0
- Outcome
- Damagee0
- Direction
- smallere0
- Value
- 40.7%e0
- Comparator
- without the predatore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize stores”
e0“Damage and losses of stored maize cobs were 40.7% and 47.4% smaller than without the predator”
Claim · model-written summary
Predator presence reduced losses of stored maize cobs by 47.4%.
- Organ / stage
- cobse0
- Treatment
- predatore0
- Outcome
- losses of stored maize cobse0
- Direction
- smallere0
- Value
- 47.4%e0
- Comparator
- without the predatore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize stores”
e0“Damage and losses of stored maize cobs were 40.7% and 47.4% smaller than without the predator”
Claim · model-written summary
Predator numbers in stores were larger one year after release.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize stores”
e0“One year after the release, larger numbers of the predator were observed in stores”
Claim · model-written summary
A year after release, P. truncatus was again reduced, although less visibly.
- Treatment
- T. nigrescense0
- Interactor
- P. truncatusProstephanus truncatuse0pest
- Second interactor
- T. nigrescensTeretrius nigrescense0biocontrol_agent
- Outcome
- P. truncatuse0
- Direction
- reducede0
- Qualifier
- not as visible as beforee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize stores”
e0“Again, P. truncatus was reduced by T. nigrescens , but this was not as visible as before”
Claim · model-written summary
After the second predator release in Morétan, Larger Grain Borer numbers declined after eight months.
- Treatment
- second release of T. nigrescense0
- Interactor
- Larger Grain Borere0pest
- Second interactor
- T. nigrescensTeretrius nigrescense0biocontrol_agent
- Outcome
- numbers of the Larger Grain Borere0
- Direction
- decreasee0
- Setting
- Morétane0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize stores”
e0“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”
Claim · model-written summary
The third trial found reduced damage and losses in maize stores.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize stores”
e0“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”
The same questions in other papers
Teretrius nigrescens · Prostephanus truncatus · Zea mays (maize)Results agree
1 paper in the same direction as this paper
- positive
biocontrol · pest · Zea mays (maize)Positive and negative results
8 papers in the same direction as this paper · 4 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- negative
10 papers more in this group
See all 14 papers →biocontrol · organism · Zea mays (maize)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.