Abstract
Pest populations on cowpea intercropped with cassava were studied in relation to changes in the canopy structure of the cassava crop canopy. Flower thrips (Megalurothrips sjostedti Tryb.), the legume pod borer, (Maruca vitrata Fabricius), and pod sucking bug complex were the pests of interest in this investigation. Four month old cassava was pruned during the second crop season of 1987 and 1988 as follows: (i) no pruning; (ii) two-thirds debranching; (iii) total defoliation; and (iv) cut-back to 60 cm above ground. There were significant differences between the pest density on cowpea in the pruned cassava treatments and that of sole cowpea. In 1987, seasonal means of 408, 387, and 298 flower thrips per 20 flowers were recorded in the cut-back, the two-thirds debranched, and the defoliated cassava, respectively, compared to 1080 flower thrips per 20 flowers in the sole cowpea. The same trend was observed in 1988. The micro-environment created by the intercrops reduced the populations of flower thrips but increased those of the pod borer. Seasonal means of 22, 17.5, 21.4, and 16.7 pod borers per 20 flowers were recorded in the intercrops compared to 15.8 in the sole crops. Pod-sucking bugs followed the same trend as that of flower thrips. Overall, intercropping cassava with cowpea can be manipulated such that it contributes to the management of cowpea pests.
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Claims 10
Claim · model-written summary
In 1987, cut-back cassava intercrops had 408 flower thrips per 20 flowers on cowpea, fewer than sole cowpea.
- Taxon
- cowpea
Vigna unguiculatat0 - Treatment
- cut-backe4
- Interactor
- Megalurothrips sjostedtiMegalurothrips sjostedtie2pest
- Outcome
- flower thripse4
- Direction
- decreaseinferrede4
- Value
- 408e4
- Qualifier
- 1080 flower thrips per 20 flowerse4
- Comparator
- sole cowpeae4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cassava intercropped with cowpea”
e2“Flower thrips (Megalurothrips sjostedti Tryb.)”
e4“In 1987, seasonal means of 408, 387, and 298 flower thrips per 20 flowers were recorded in the cut-back, the two-thirds debranched, and the defoliated cassava, respectively, compared to 1080 flower thrips per 20 flowers in the sole cowpea”
Claim · model-written summary
In 1987, two-thirds debranched cassava intercrops had 387 flower thrips per 20 flowers on cowpea, fewer than sole cowpea.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- two-thirds debranchede4
- Interactor
- Megalurothrips sjostedtiMegalurothrips sjostedtie2pest
- Outcome
- flower thripse4
- Direction
- decreaseinferrede4
- Value
- 387e4
- Qualifier
- 1080 flower thrips per 20 flowerse4
- Comparator
- sole cowpeae4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cassava intercropped with cowpea”
e2“Flower thrips (Megalurothrips sjostedti Tryb.)”
e4“In 1987, seasonal means of 408, 387, and 298 flower thrips per 20 flowers were recorded in the cut-back, the two-thirds debranched, and the defoliated cassava, respectively, compared to 1080 flower thrips per 20 flowers in the sole cowpea”
Claim · model-written summary
In 1987, defoliated cassava intercrops had 298 flower thrips per 20 flowers on cowpea, fewer than sole cowpea.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- defoliated cassavae4
- Interactor
- Megalurothrips sjostedtiMegalurothrips sjostedtie2pest
- Outcome
- flower thripse4
- Direction
- decreaseinferrede4
- Value
- 298e4
- Qualifier
- 1080 flower thrips per 20 flowerse4
- Comparator
- sole cowpeae4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cassava intercropped with cowpea”
e2“Flower thrips (Megalurothrips sjostedti Tryb.)”
e4“In 1987, seasonal means of 408, 387, and 298 flower thrips per 20 flowers were recorded in the cut-back, the two-thirds debranched, and the defoliated cassava, respectively, compared to 1080 flower thrips per 20 flowers in the sole cowpea”
Claim · model-written summary
Cassava intercrops had 22 pod borers per 20 flowers on cowpea, more than sole crops.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- intercropse6
- Interactor
- Maruca vitrata
Maruca vitratae3pest - Outcome
- pod borerse6
- Direction
- increaseinferrede0
- Value
- 22e6
- Qualifier
- 15.8 in the sole cropse6
- Comparator
- sole cropse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cassava intercropped with cowpea”
e3“the legume pod borer, (Maruca vitrata Fabricius)”
e6“Seasonal means of 22, 17.5, 21.4, and 16.7 pod borers per 20 flowers were recorded in the intercrops compared to 15.8 in the sole crops”
e0“The micro-environment created by the intercrops reduced the populations of flower thrips but increased those of the pod borer”
Claim · model-written summary
Cassava intercrops had 17.5 pod borers per 20 flowers on cowpea, more than sole crops.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- intercropse6
- Interactor
- Maruca vitrataMaruca vitratae3pest
- Outcome
- pod borerse6
- Direction
- increaseinferrede0
- Value
- 17.5e6
- Qualifier
- 15.8 in the sole cropse6
- Comparator
- sole cropse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cassava intercropped with cowpea”
e3“the legume pod borer, (Maruca vitrata Fabricius)”
e6“Seasonal means of 22, 17.5, 21.4, and 16.7 pod borers per 20 flowers were recorded in the intercrops compared to 15.8 in the sole crops”
e0“The micro-environment created by the intercrops reduced the populations of flower thrips but increased those of the pod borer”
Claim · model-written summary
Cassava intercrops had 21.4 pod borers per 20 flowers on cowpea, more than sole crops.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- intercropse6
- Interactor
- Maruca vitrataMaruca vitratae3pest
- Outcome
- pod borerse6
- Direction
- increaseinferrede0
- Value
- 21.4e6
- Qualifier
- 15.8 in the sole cropse6
- Comparator
- sole cropse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cassava intercropped with cowpea”
e3“the legume pod borer, (Maruca vitrata Fabricius)”
e6“Seasonal means of 22, 17.5, 21.4, and 16.7 pod borers per 20 flowers were recorded in the intercrops compared to 15.8 in the sole crops”
e0“The micro-environment created by the intercrops reduced the populations of flower thrips but increased those of the pod borer”
Claim · model-written summary
Cassava intercrops had 16.7 pod borers per 20 flowers on cowpea, more than sole crops.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- intercropse6
- Interactor
- Maruca vitrataMaruca vitratae3pest
- Outcome
- pod borerse6
- Direction
- increaseinferrede0
- Value
- 16.7e6
- Qualifier
- 15.8 in the sole cropse6
- Comparator
- sole cropse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cassava intercropped with cowpea”
e3“the legume pod borer, (Maruca vitrata Fabricius)”
e6“Seasonal means of 22, 17.5, 21.4, and 16.7 pod borers per 20 flowers were recorded in the intercrops compared to 15.8 in the sole crops”
e0“The micro-environment created by the intercrops reduced the populations of flower thrips but increased those of the pod borer”
Claim · model-written summary
Pod-sucking bugs on cowpea decreased in cassava intercrops, following the flower thrips trend.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- intercropse0
- Outcome
- Pod-sucking bugse7
- Direction
- decreaseinferrede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cassava intercropped with cowpea”
e7“Pod-sucking bugs followed the same trend as that of flower thrips”
e0“The micro-environment created by the intercrops reduced the populations of flower thrips but increased those of the pod borer”
Claim · model-written summary
In 1988 the intercrops reduced flower thrips on cowpea, as in 1987.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- intercropse0
- Interactor
- Megalurothrips sjostedtiMegalurothrips sjostedtie2pest
- Outcome
- flower thripse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cassava intercropped with cowpea”
e2“Flower thrips (Megalurothrips sjostedti Tryb.)”
e5“The same trend was observed in 1988”
e0“The micro-environment created by the intercrops reduced the populations of flower thrips but increased those of the pod borer”
Claim · model-written summary
Intercropping cassava with cowpea can be manipulated to help manage cowpea pests.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- intercropping cassava with cowpeae1
- Outcome
- management of cowpea pestse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cassava intercropped with cowpea”
e1“intercropping cassava with cowpea can be manipulated such that it contributes to the management of cowpea pests”
The same questions in other papers
intercropping · Maruca vitrata · Vigna unguiculata (cowpea)Positive and negative results
1 in the opposite direction
- positive
intercropping · Megalurothrips sjostedti · Vigna unguiculata (cowpea)Results agree
5 papers in the same direction as this paper
- positive
- positive
- positive
2 papers more in this group
See all 6 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.