Abstract
Rice (Oryza sativa) is an increasingly popular food in Africa. As much as 30% of yields are lost due to blast disease caused by Magnaporthe oryzae. Several commercial biopesticides of Bacillus subtilis, Trichoderma asperellum, and Serratia sp. strains were evaluated under field conditions for their effects against rice blast and yield at one site in Kenya and three sites in Tanzania in 2020 and 2021. Each biopesticide was applied as a dipping treatment at transplanting, post-transplanting foliar spraying, or both. Using biopesticides not only achieved blast control but also increased grain yield, particularly in low-production regions in Tanzania, with a yield increase of >100%. For higher-production sites with low disease pressure, the yield increase through biopesticides over the untreated control was limited, although significant disease suppression was achieved. Dipping alone was sufficient to suppress disease and improve yield unless disease pressure was high. The differences among the three biopesticides varied with site/year but generally were small. Improved yield using biopesticides is unlikely to result solely from reduced blast development, but also from improved plant development. The present study suggests that these commercial biopesticides should be applied in rice production, particularly in subsistence farming.
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Claims 9
Claim · model-written summary
Biopesticides controlled rice blast.
- Taxon
- Rice
Oryza sativat0 - Treatment
- biopesticidese0
- Interactor
- Magnaporthe oryzae
Pyricularia oryzaee1pathogen - Outcome
- blast controle0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Using biopesticides not only achieved blast control but also increased grain yield, particularly in low-production regions in Tanzania, with a yield increase of >100%.”
e1“blast disease caused by Magnaporthe oryzae”
t0“Rice”
Claim · model-written summary
Biopesticides increased rice grain yield by more than 100% in low-production regions of Tanzania.
- Taxon
- RiceOryza sativat0
- Treatment
- biopesticidese0
- Outcome
- grain yielde0
- Direction
- increasede0
- Value
- >100%e0
- Setting
- Tanzaniae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Using biopesticides not only achieved blast control but also increased grain yield, particularly in low-production regions in Tanzania, with a yield increase of >100%.”
t0“Rice”
Claim · model-written summary
At higher-production sites with low disease pressure, biopesticide yield gains over untreated control were limited.
- Taxon
- RiceOryza sativat0
- Treatment
- biopesticidese0
- Outcome
- yield increasee0
- Direction
- limitede0
- Qualifier
- higher-production sites with low disease pressuree0
- Comparator
- untreated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For higher-production sites with low disease pressure, the yield increase through biopesticides over the untreated control was limited, although significant disease suppression was achieved.”
t0“Rice”
Claim · model-written summary
At higher-production sites with low disease pressure, biopesticides significantly suppressed blast disease.
- Taxon
- RiceOryza sativat0
- Treatment
- biopesticidese0
- Outcome
- disease suppressione0
- Direction
- suppressione0
- Qualifier
- higher-production sites with low disease pressuree0
- Comparator
- untreated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For higher-production sites with low disease pressure, the yield increase through biopesticides over the untreated control was limited, although significant disease suppression was achieved.”
t0“Rice”
Claim · model-written summary
Dipping alone suppressed rice blast except where disease pressure was high.
- Taxon
- RiceOryza sativat0
- Treatment
- Dipping alonee0
- Outcome
- diseasee0
- Direction
- suppresse0
- Qualifier
- unless disease pressure was highe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dipping alone was sufficient to suppress disease and improve yield unless disease pressure was high.”
t0“Rice”
Claim · model-written summary
Dipping alone improved rice yield except where disease pressure was high.
- Taxon
- RiceOryza sativat0
- Treatment
- Dipping alonee0
- Outcome
- yielde0
- Direction
- improvee0
- Qualifier
- unless disease pressure was highe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dipping alone was sufficient to suppress disease and improve yield unless disease pressure was high.”
t0“Rice”
Claim · model-written summary
Differences among three biopesticides varied by site and year but were generally small.
- Taxon
- RiceOryza sativat0
- Outcome
- differences among the three biopesticidese0
- Qualifier
- varied with site/year but generally were smalle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The differences among the three biopesticides varied with site/year but generally were small.”
t0“Rice”
Claim · model-written summary
Authors suggest biopesticide yield gains also result from improved plant development.
- Taxon
- RiceOryza sativat0
- Treatment
- biopesticidese0
- Outcome
- Improved yielde0
- Qualifier
- improved plant developmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Improved yield using biopesticides is unlikely to result solely from reduced blast development, but also from improved plant development.”
t0“Rice”
Claim · model-written summary
Authors recommend commercial biopesticides in rice production, particularly subsistence farming.
- Taxon
- riceOryza sativae0
- Outcome
- biopesticides should be applied in rice productione0
- Qualifier
- particularly in subsistence farminge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The present study suggests that these commercial biopesticides should be applied in rice production, particularly in subsistence farming.”
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