Abstract
The use of non-conventional methods in the management of stored product insect pests is gaining popularity, particularly due to problems associated with chemical control. The effect of ozone on Sitophilus oryzae (L.) (Coleoptera: Curculionidae), an internal feeder of stored wheat and other grains, was investigated using dose-response experiments. Eggs, immature stages within wheat kernels, and adults were exposed to an ozone concentration of 200 ppm for 6, 18, and 30 h. Insect life stages were placed at a depth of 5, 15, and 25 cm in wheat filled in PVC pipes. Effect of ozone on S. oryzae life stages was evaluated as the percent mortality of treated eggs, immature stages, and adults. Egg mortality was recorded as the percentage of eggs that failed to hatch 10 d after treatment (DAT), and mortality in immature stages was recorded as the percentage of immature insects that failed to develop into adults 28 DAT at 28°C. Mortality of adults was recorded as the percentage that died 0, 1, and 2 DAT. Egg mortality at the 5 cm depth in wheat exposed to ozone for 30 h was significantly higher than the mortality when exposed for 18 h. When the three depths were compared, at 18 h and 30 h exposure times, fewer adults emerged from immature insects placed at 5 cm compared with insects placed at 15 or 25 cm depths. Adult mortality in insects placed at the 5 cm depth for all exposure times was significantly higher than at 15 and 25 cm at 2 DAT. Findings from this study suggest that ozone may be an effective fumigant; however, mortality of S. oryzae life stages is dependent on the exposure time, depth of occurrence in the wheat mass, or post treatment time (DAT).
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Claims 4
Claim · model-written summary
Egg mortality of S. oryzae at 5 cm depth in wheat was significantly higher after 30 h of ozone than after 18 h.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- ozone for 30 he0
- Interactor
- Sitophilus oryzae
Sitophilus oryzaet0pest - Outcome
- Egg mortalitye0
- Direction
- highere0
- Comparator
- exposed for 18 he0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Egg mortality at the 5 cm depth in wheat exposed to ozone for 30 h was significantly higher than the mortality when exposed for 18 h”
t0“Sitophilus oryzae”
Claim · model-written summary
At 18 h and 30 h of ozone, fewer S. oryzae adults emerged from immature insects placed at 5 cm than at 15 or 25 cm depth.
- Taxon
- wheatTriticum aestivume0
- Treatment
- placed at 5 cme1
- Interactor
- Sitophilus oryzaeSitophilus oryzaet0pest
- Outcome
- fewer adults emerged from immature insectse1
- Direction
- fewere1
- Comparator
- 15 or 25 cm depthse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wheat filled in PVC pipes”
e1“at 18 h and 30 h exposure times, fewer adults emerged from immature insects placed at 5 cm compared with insects placed at 15 or 25 cm depths”
t0“Sitophilus oryzae”
Claim · model-written summary
Adult S. oryzae mortality at 5 cm depth was significantly higher than at 15 and 25 cm at 2 DAT across all exposure times.
- Taxon
- wheatTriticum aestivume0
- Treatment
- placed at the 5 cm depthe1
- Interactor
- Sitophilus oryzaeSitophilus oryzaet0pest
- Outcome
- Adult mortalitye1
- Direction
- highere1
- Qualifier
- 2 DATe1
- Comparator
- 15 and 25 cme1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wheat filled in PVC pipes”
e1“Adult mortality in insects placed at the 5 cm depth for all exposure times was significantly higher than at 15 and 25 cm at 2 DAT”
t0“Sitophilus oryzae”
Claim · model-written summary
Ozone may be an effective fumigant, but S. oryzae mortality depends on exposure time, depth in the wheat mass and post-treatment time.
- Taxon
- wheatTriticum aestivume1
- Interactor
- Sitophilus oryzaeSitophilus oryzaet0pest
- Outcome
- effective fumigante0
- Qualifier
- dependent on the exposure time, depth of occurrence in the wheat mass, or post treatment timee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ozone may be an effective fumigant”
e1“mortality of S. oryzae life stages is dependent on the exposure time, depth of occurrence in the wheat mass, or post treatment time (DAT)”
t0“Sitophilus oryzae”
The same questions in other papers
ozone · Sitophilus oryzae · Triticum aestivum (wheat)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.