Abstract
We tested the effect of simultaneous infestation by adults of the lesser grain borer, Rhyzopertha dominica (F.) and the rice weevil, Sitophilus oryzae (L.) on six sorghum varieties. For this purpose, vials containing sorghum and either each species alone or both species were placed at 30 °C and 65% relative humidity. After ten days, all parental adults were removed and the vials were returned to the same conditions. Five weeks later the vials were emptied, to record adult emergence, the percentage of insect damaged kernels (IDK), and frass weight. Our results indicated that progeny production capacity for both species was not affected by the simultaneous presence of R. dominica and S. oryzae, and that adult emergence was more of a variety- mediated parameter. Both species had previously shown similar preferences towards specific sorghum varieties. IDK and frass were higher in vials containing R. dominica alone rather than S. oryzae alone, but these indicators were not always related to progeny production. Specifically, the most and the least frass production was noted on Sumac and PE sorghum varieties for both species, respectively. When the two species were placed together in the same vial, the most frass production was noted in the Non-Waxy Burgundy and Sumac varieties. Our results suggest that varietal resistance in sorghum could be utilized to help reduce post-harvest infestations by S. oryzae and R. dominica.
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Claims 9
Claim · model-written summary
Simultaneous presence of the two pests did not affect progeny production.
- Treatment
- simultaneous presence of R. dominica and S. oryzaee0
- Interactor
- R. dominica
Rhyzopertha dominicae0pest - Second interactor
- S. oryzae
Sitophilus oryzaee0pest - Outcome
- progeny production capacity for both speciese0
- Direction
- not affectede0
Not reportedTaxonComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“progeny production capacity for both species was not affected by the simultaneous presence of R. dominica and S. oryzae”
Claim · model-written summary
Adult emergence depended more on sorghum variety.
Not reportedTaxon
Verbatim
e0“adult emergence was more of a variety- mediated parameter”
Claim · model-written summary
Insect damaged kernels were higher with R. dominica alone than S. oryzae alone.
- Treatment
- R. dominica alonee0
- Interactor
- R. dominicaRhyzopertha dominicae0pest
- Second interactor
- S. oryzaeSitophilus oryzaee0pest
- Outcome
- IDKe0
- Direction
- highere0
- Comparator
- S. oryzae alonee0
Not reportedTaxon
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“IDK and frass were higher in vials containing R. dominica alone rather than S. oryzae alone”
Claim · model-written summary
Frass was higher with R. dominica alone than S. oryzae alone.
- Treatment
- R. dominica alonee0
- Interactor
- R. dominicaRhyzopertha dominicae0pest
- Second interactor
- S. oryzaeSitophilus oryzaee0pest
- Outcome
- frasse0
- Direction
- highere0
- Comparator
- S. oryzae alonee0
Not reportedTaxon
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“IDK and frass were higher in vials containing R. dominica alone rather than S. oryzae alone”
Claim · model-written summary
Damage indicators were not consistently related to progeny production.
Not reportedTaxonDirection
Verbatim
e0“these indicators were not always related to progeny production”
Claim · model-written summary
Both pests produced the most frass on Sumac.
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the most and the least frass production was noted on Sumac and PE sorghum varieties for both species, respectively”
Claim · model-written summary
Both pests produced the least frass on PE.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the most and the least frass production was noted on Sumac and PE sorghum varieties for both species, respectively”
Claim · model-written summary
With both pest species together, frass was greatest on Non-Waxy Burgundy and Sumac.
Not reportedTaxon
Verbatim
e0“When the two species were placed together in the same vial, the most frass production was noted in the Non-Waxy Burgundy and Sumac varieties.”
Claim · model-written summary
The authors suggest using varietal resistance to reduce postharvest infestations.
- Interactor
- S. oryzaeSitophilus oryzaee0pest
- Second interactor
- R. dominicaRhyzopertha dominicae0pest
- Outcome
- reduce post-harvest infestationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“varietal resistance in sorghum could be utilized to help reduce post-harvest infestations by S. oryzae and R. dominica”