Abstract
Losses in seed yields due to damage by seed insect pests were studied on unsprayed and sprayed cowpea plants at Foumbot, located in the western highland savanna zone of Cameroon, in 1988 and 1989. Major pests recorded in the study site were Melanagromyza vignalis Spencer (Diptera : Agromyzidae), Marucatestulalis Geyer (Lepidoptera : Pyralidae), Cydia ptychora Meyrick (Lepidoptera : Tortricidae), Heliothis armigera Hubner (Lepidoptera : Noctuidae), Aphis craccivora Koch (Homoptera : Aphididae), Apion species (Coleoptera : Curculionidae), Coreid bugs (Heteroptera : Coreidae), and Bruchids (Coleoptera : Bruchidae). Yields of undamaged cowpea seeds from unsprayed and sprayed plants of local cultivars acquired from Badun, Melong, Foumbot and Befang were comparable with those from MA 2/1, an improved cultivar from the International Institute for Tropical Agriculture that has been released in Cameroon by the Institute for Agronomie Research. Melanagromyza, Maruca and Coreid bugs caused 70-80 % of seed damage on unsprayed and sprayed plants. Fortnightly spraying of plants with deltamethrin at 12.5g. a. i./ha, significantly reduced yield loss due to damage by Maruca sp., the overall loss in seed yields/ha and % loss of potential seed yield, in all five cowpea cultivars used in this study. However, deltamethrin appeared ineffective in reducing seed yield loss caused by Melanagromyza and Coreid bugs.
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Claims 7
Claim · model-written summary
Four local cultivars had undamaged seed yields comparable with MA 2/1.
- Taxon
- cowpea
Vigna unguiculatae0 - Material
- local cultivars acquired from Badun, Melong, Foumbot and Befange0
- Outcome
- Yields of undamaged cowpea seedse0
- Direction
- comparablee0
- Comparator
- MA 2/1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of undamaged cowpea seeds from unsprayed and sprayed plants of local cultivars acquired from Badun, Melong, Foumbot and Befang were comparable with those from MA 2/1”
t0“cowpea”
Claim · model-written summary
Three pest groups caused 70–80% seed damage.
- Taxon
- cowpeaVigna unguiculatat0
- Interactor
- Melanagromyza
Melanagromyzae0pest - Outcome
- seed damagee0
- Value
- 70-80 %e0
- Qualifier
- Maruca and Coreid bugse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Melanagromyza, Maruca and Coreid bugs caused 70-80 % of seed damage on unsprayed and sprayed plants.”
t0“cowpea”
Claim · model-written summary
Deltamethrin significantly reduced Maruca related yield loss.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- Fortnightly spraying of plants with deltamethrin at 12.5g. a. i./hae0
- Outcome
- yield loss due to damage by Maruca sp.e0
- Direction
- reducede0
MarucaNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fortnightly spraying of plants with deltamethrin at 12.5g. a. i./ha, significantly reduced yield loss due to damage by Maruca sp., the overall loss in seed yields/ha and % loss of potential seed yield, in all five cowpea cultivars used in this study.”
t0“cowpea”
Claim · model-written summary
Deltamethrin significantly reduced overall yield loss per hectare.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- Fortnightly spraying of plants with deltamethrin at 12.5g. a. i./hae0
- Outcome
- overall loss in seed yields/hae0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fortnightly spraying of plants with deltamethrin at 12.5g. a. i./ha, significantly reduced yield loss due to damage by Maruca sp., the overall loss in seed yields/ha and % loss of potential seed yield, in all five cowpea cultivars used in this study.”
t0“cowpea”
Claim · model-written summary
Deltamethrin significantly reduced the percentage of potential seed yield lost.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- Fortnightly spraying of plants with deltamethrin at 12.5g. a. i./hae0
- Outcome
- % loss of potential seed yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fortnightly spraying of plants with deltamethrin at 12.5g. a. i./ha, significantly reduced yield loss due to damage by Maruca sp., the overall loss in seed yields/ha and % loss of potential seed yield, in all five cowpea cultivars used in this study.”
t0“cowpea”
Claim · model-written summary
Deltamethrin appeared ineffective against Melanagromyza associated yield loss.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- deltamethrine0
- Interactor
- MelanagromyzaMelanagromyzae0pest
- Outcome
- seed yield loss caused by Melanagromyzae0
- Direction
- ineffectivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“deltamethrin appeared ineffective in reducing seed yield loss caused by Melanagromyza and Coreid bugs.”
t0“cowpea”
Claim · model-written summary
Deltamethrin appeared ineffective against coreid bug associated yield loss.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- deltamethrine0
- Interactor
- Coreid bugse0pest
- Outcome
- seed yield losse0
- Direction
- ineffectivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“deltamethrin appeared ineffective in reducing seed yield loss caused by Melanagromyza and Coreid bugs.”
t0“cowpea”
The same questions in other papers
deltamethrin · yield · 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 →application · yield · Vigna unguiculata (cowpea)Positive and negative results
111 papers in the same direction as this paper · 12 in the opposite direction · 2 reporting no difference from an alternative
- no effect
- no effect
- negative
122 papers more in this group
See all 126 papers →application · Maruca · Vigna unguiculata (cowpea)Results agree
1 paper in the same direction as this paper
- 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.