Abstract
BACKGROUND: Corn intercropped with ruzigrass is common in Brazil, and it can improve the physicochemical features of soils, increase water retention, and suppress the emergence of resistant weeds and soil nematodes. As both corn and ruzigrass are hosts to Spodoptera frugiperda (the main corn pest in South America), the cultivation of both these plants in the same place at one time motivates investigation into the pest population dynamics. We hypothesize that the intercropping system influences S. frugiperda pressure and leaf injury in corn. Considering that if corn hybrids with high dose toxin expression are used, ruzigrass may be a potential host to susceptible S. frugiperda larvae, consequently an alternative refuge and be included as a tool for the resistant management of Bt corn. To test these hypotheses about the use of ruzigrass as an alternative host of S. frugiperda in an intercropping system with corn, we conducted field trials in three seasons to verify S. frugiperda population dynamics and leaf injury to crop systems. In addition to phenotypic evaluation, we also characterized molecularly S. frugiperda strains collected in corn and ruzigrass to identify strain differences. RESULTS: The insects collected in both corn and ruzigrass were identified as corn strains. Ruzigrass was used as a S. frugiperda host during all crop cycles. The intercropped system did not increase the S. frugiperda population or leaf injury on Bt corn. CONCLUSION: The results suggest that the intercropped system is not prejudicial to Bt corn cultivation since high dose concept applies to all larvae instars. The results also suggest that ruzigrass may be used as a promising alternative refuge in Bt corn agroecosystems, if compliance with management strategies is followed. © 2021 Society of Chemical Industry.
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Claims 5
Claim · model-written summary
Insects collected from corn and ruzigrass were identified as corn strains.
- Taxon
- corn
Zea mays subsp. mayse0 - Outcome
- corn strainse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The insects collected in both corn and ruzigrass were identified as corn strains.”
Claim · model-written summary
Ruzigrass hosted S. frugiperda during all crop cycles.
- Taxon
- Ruzigrasse0
- Interactor
- S. frugiperda
.jpg?width=60)
Spodoptera frugiperdae0pest - Outcome
- S. frugiperda hoste0
- Qualifier
- all crop cyclese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Ruzigrass was used as a S. frugiperda host during all crop cycles.”
Claim · model-written summary
Intercropping did not increase the S. frugiperda population on Bt corn.
- Taxon
- Bt corne0
- Treatment
- intercropped systeme0
- Interactor
- S. frugiperdaSpodoptera frugiperdae0pest
- Outcome
- S. frugiperda populatione0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The intercropped system did not increase the S. frugiperda population or leaf injury on Bt corn.”
Claim · model-written summary
Intercropping did not increase leaf injury on Bt corn.
- Taxon
- Bt corne0
- Treatment
- intercropped systeme0
- Interactor
- S. frugiperdaSpodoptera frugiperdae0pest
- Outcome
- leaf injurye0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The intercropped system did not increase the S. frugiperda population or leaf injury on Bt corn.”
Claim · model-written summary
The authors suggest ruzigrass as a potential alternative refuge in Bt corn agroecosystems if management strategies are followed.
Verbatim
e0“ruzigrass may be used as a promising alternative refuge in Bt corn agroecosystems, if compliance with management strategies is followed.”
The same questions in other papers
intercropping · Spodoptera frugiperda · Zea mays (maize)Positive and negative results
6 in the opposite direction
- positive
- positive
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3 papers more in this group
See all 7 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.