Abstract
The response of pests to the effects of a botanical insecticide can vary spatially and temporally. To test whether efficacy of botanicals differed spatially, the insecticidal efficacy of Gnidia kaussiana and Ocimum canum against Callosobruchus maculatus was investigated in two different agro-ecological zones of Cameroon, i.e. Maroua and Ngaoundéré (sudano-sahelian and sudano-guinean zones, respectively). Experiments were, therefore, conducted to determine the insect mortality, progeny production, grain damage and weight loss in cowpea. G. kaussiana was more effective against C. maculatus in Maroua (LD50 = 0.12 g/kg at 6th day of exposure) than in Ngaoundéré (LD50 = 4.35 g/kg at 6th day of exposure). Moreover, it was more toxic than O. canum extract and neem seed oil (reference), irrespective to the agro-ecological zones. Overall, the performance of O. canum did not vary significantly between the two zones, and was slightly more active (LD50 = 4.66 g/kg) than the reference insecticide neem seed oil (LD50 = 4.89 g/kg) in Ngaoundéré in contrast to the results recoded in Maroua (LD50 = 1.44 g/kg and 2.60 g/kg, respectively for neem seed oil and O. canum at 6 days post exposure). In view of the above, there were some discrepancies in extract performance between Maroua and Ngaoundéré. Thus, the establishment of dose rates of insecticidal products formulated from G. kaussiana must be specific to an environment in contrast to those from O. canum.
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Claims 6
Claim · model-written summary
Gnidia kaussiana was more effective against Callosobruchus maculatus in Maroua than Ngaoundéré.
- Taxon
- cowpea
Vigna unguiculatae1 - Treatment
- G. kaussianae0
- Interactor
- C. maculatus
Callosobruchus maculatuse0pest - Outcome
- C. maculatuse0
- Direction
- more effectivee0
- Value
- LD50 = 0.12 g/kge0
- Qualifier
- LD50 = 4.35 g/kge0
- Comparator
- Ngaoundérée0
- Setting
- Marouae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“G. kaussiana was more effective against C. maculatus in Maroua (LD50 = 0.12 g/kg at 6th day of exposure) than in Ngaoundéré (LD50 = 4.35 g/kg at 6th day of exposure)”
t0“Gnidia kaussiana Meisn (Thymeleaceae) and Ocimum canum Sims (Lamiaceae) Botanical Insecticides”
e1“grain damage and weight loss in cowpea”
Claim · model-written summary
Gnidia kaussiana was more toxic than Ocimum canum extract and neem seed oil across zones.
- Taxon
- cowpeaVigna unguiculatae1
- Treatment
- Gnidia kaussianat0
- Outcome
- toxice0
- Direction
- more toxice0
- Comparator
- O. canum extract and neem seed oile0
Not reportedInteractor
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it was more toxic than O. canum extract and neem seed oil (reference), irrespective to the agro-ecological zones”
e1“grain damage and weight loss in cowpea”
t0“Gnidia kaussiana Meisn”
Claim · model-written summary
Ocimum canum performance did not vary significantly between the two zones.
- Taxon
- cowpeaVigna unguiculatae1
- Outcome
- performance of O. canume0
- Direction
- did not varye0
- Setting
- the two zonese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the performance of O. canum did not vary significantly between the two zones”
e1“grain damage and weight loss in cowpea”
Claim · model-written summary
Ocimum canum was slightly more active than neem seed oil in Ngaoundéré, with respective LD50 values of 4.66 and 4.89 g/kg.
- Taxon
- cowpeaVigna unguiculatae1
- Treatment
- Ocimum canumt0
- Outcome
- activee0
- Direction
- more activee0
- Value
- LD50 = 4.66 g/kge0
- Qualifier
- LD50 = 4.89 g/kge0
- Comparator
- neem seed oile0
- Setting
- Ngaoundérée0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“slightly more active (LD50 = 4.66 g/kg) than the reference insecticide neem seed oil (LD50 = 4.89 g/kg) in Ngaoundéré”
e1“grain damage and weight loss in cowpea”
t0“Ocimum canum Sims”
Claim · model-written summary
In Maroua neem seed oil had a lower LD50 than Ocimum canum at six days.
- Taxon
- cowpeaVigna unguiculatae1
- Treatment
- neem seed oile0
- Outcome
- LD50e0
- Value
- LD50 = 1.44 g/kge0
- Qualifier
- 2.60 g/kge0
- Comparator
- O. canume0
- Setting
- Marouae0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Maroua (LD50 = 1.44 g/kg and 2.60 g/kg, respectively for neem seed oil and O. canum at 6 days post exposure)”
e1“grain damage and weight loss in cowpea”
Claim · model-written summary
The authors recommend environment-specific dose rates for products made from Gnidia kaussiana.
- Taxon
- cowpeaVigna unguiculatae1
- Outcome
- dose rates of insecticidal products formulated from G. kaussianae0
- Qualifier
- specific to an environmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“establishment of dose rates of insecticidal products formulated from G. kaussiana must be specific to an environment”
e1“grain damage and weight loss in cowpea”
The same questions in other papers
botanical · pest · Vigna unguiculata (cowpea)Positive and negative results
122 papers in the same direction as this paper · 2 in the opposite direction · 1 reporting no difference from an alternative
- positive
- no effect
- no effect
122 papers more in this group
See all 126 papers →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.