Abstract
Field studies were conducted during the cropping seasons of 2008 and 2009 at Ilorin, Nigeria to evaluate the influence of weed removal on insect population and yield of cowpea [Vigna unguiculata (L) Walp]. The trial was designed as a randomized complete block in a split-plot arrangement and three replications. The main plots were two cowpea varieties while the sub plots were three weeding regimes (no-weeding, 1 hand weeding at 3 weeks after sowing and 2 hand weeding at 3 and 6 weeks after sowing). The cowpea varieties were similar in most of the parameters assessed. Reduced cowpea biomass, pods and grain yield were associated with weedy cowpea plots. Grain yield reduction due to uncontrolled weed growth was estimated to be 50-60 % and 70-80 % compared to one-hand weeding and two-hand weeding, respectively, while a yield reduction of 30-60 % in one-hand weeding compared to two-hand weeding. Weedy situation in the cowpea ecosystem supported higher insect population whereas Aphis craccivora Koch and Empoasca spp. population increased when the crops experienced weed-free situation because of the influence of groundcover on the optomotor landing response of the aphids and probably due to reduction in natural enemies of Empoasca spp. It is concluded that a search for alternative methods of Pests Management, which entails a quantitative understanding of the dynamics of weed and insect population outflow in cowpea agroecosystem in the humid tropics is needed for a profitable cowpea production.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
Weedy cowpea plots had reduced biomass, pods and grain yield.
- Taxon
- cowpea
Vigna unguiculatae0 - Treatment
- weedy cowpea plotse0
- Outcome
- cowpea biomass, pods and grain yielde0
- Direction
- Reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduced cowpea biomass, pods and grain yield were associated with weedy cowpea plots.”
Claim · model-written summary
Uncontrolled weeds reduced grain yield by 50-60 % compared with one hand weeding.
- Treatment
- uncontrolled weed growthe0
- Outcome
- Grain yielde0
- Direction
- reductione0
- Value
- 50-60 %e0
- Comparator
- one-hand weedinge0
Not reportedTaxon
Verbatim
e0“Grain yield reduction due to uncontrolled weed growth was estimated to be 50-60 % and 70-80 % compared to one-hand weeding and two-hand weeding, respectively”
Claim · model-written summary
Uncontrolled weeds reduced grain yield by 70-80 % compared with two hand weeding.
- Treatment
- uncontrolled weed growthe0
- Outcome
- Grain yielde0
- Direction
- reductione0
- Value
- 70-80 %e0
- Comparator
- two-hand weedinge0
Not reportedTaxon
Verbatim
e0“Grain yield reduction due to uncontrolled weed growth was estimated to be 50-60 % and 70-80 % compared to one-hand weeding and two-hand weeding, respectively”
Claim · model-written summary
One hand weeding had 30-60 % lower yield than two hand weeding.
- Treatment
- one-hand weedinge0
- Outcome
- yielde0
- Direction
- reductione0
- Value
- 30-60 %e0
- Comparator
- two-hand weedinge0
Not reportedTaxon
Verbatim
e0“a yield reduction of 30-60 % in one-hand weeding compared to two-hand weeding”
Claim · model-written summary
Weedy conditions supported higher insect populations.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- Weedy situatione0
- Outcome
- insect populatione0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Weedy situation in the cowpea ecosystem supported higher insect population”
Claim · model-written summary
Aphis craccivora Koch populations increased under weed free conditions.
- Treatment
- weed-free situatione0
- Interactor
- Aphis craccivora Koch
Aphis craccivorae0pest - Outcome
- Aphis craccivora Koche0
- Direction
- increasede0
Not reportedTaxon
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Aphis craccivora Koch and Empoasca spp. population increased when the crops experienced weed-free situation”
Claim · model-written summary
Empoasca spp. populations increased under weed free conditions.
EmpoascaNot reportedTaxon
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Aphis craccivora Koch and Empoasca spp. population increased when the crops experienced weed-free situation”
Claim · model-written summary
The authors call for alternative pest management methods based on weed and insect dynamics.
- Taxon
- cowpeaVigna unguiculatae0
- Outcome
- alternative methods of Pests Managemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a search for alternative methods of Pests Management, which entails a quantitative understanding of the dynamics of weed and insect population outflow in cowpea agroecosystem in the humid tropics is needed”
The same questions in other papers
herbicide · yield · Vigna unguiculata (cowpea)Positive and negative results
7 papers in the same direction as this paper · 45 in the opposite direction
- positive
- positive
- positive
49 papers more in this group
See all 53 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.