Abstract
A laboratory study was conducted to determine the efficacy of Psidium guajava and Ocimum gratissimum leaf oils for Sitophilus zeamais control. The experimental design was a completely randomized design with three replications. The leaf oil was extracted using a Soxhlet extractor. The leaf oils at four levels of concentration were mixed with 20 g of disinfested maize in 2 by 5 cm containers. All treatments with the leaf oils showed a significant level of toxicity to the weevil. The highest concentration (4%) of the leaf oil of the plant material tested induced the highest mortality in S. zeamais after six days. Grains treated with the leaf oil extracts significantly reduced the number of progeny emergence of both F1 and F2 generations of S. zeamais, and evoked low weight loss and seed damage on grains treated with the highest dosage of the leaf oil extract. P. guajava was found to be the most effective, recording 100% mortality of S. zeamais after five days, lower LC50 value (1.94 µml/L), lower F1 and F2 emergence (0.000 ± 0.000), lower percentage weight loss (1.00%), lower percentage seed damage (11%), and higher viability (50%), which compared favorably with that recorded in the positive control. Further studies should be conducted to identify the most bioactive ingredient in these plant leaf oils.
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Claims 10
Claim · model-written summary
Leaf oils caused significant toxicity to maize weevil.
- Treatment
- leaf oilse0
- Interactor
- Sitophilus zeamais
Sitophilus zeamaist0pest - Outcome
- toxicity to the weevile0
Zea maysNot reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All treatments with the leaf oils showed a significant level of toxicity to the weevil”
t0“Maize Weevil (Sitophilus zeamais M.)”
Claim · model-written summary
The 4% concentration caused the highest weevil mortality after six days.
- Treatment
- highest concentration (4%) of the leaf oile0
- Interactor
- S. zeamaisSitophilus zeamaise0pest
- Outcome
- mortality in S. zeamaise0
- Direction
- higheste0
- Value
- 4%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest concentration (4%) of the leaf oil of the plant material tested induced the highest mortality in S. zeamais after six days”
t0“Maize Weevil (Sitophilus zeamais M.)”
Claim · model-written summary
Leaf oil treated grains reduced F1 and F2 weevil progeny emergence.
- Treatment
- leaf oil extractse0
- Interactor
- S. zeamaisSitophilus zeamaise0pest
- Outcome
- number of progeny emergence of both F1 and F2 generations of S. zeamaise0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grains treated with the leaf oil extracts significantly reduced the number of progeny emergence of both F1 and F2 generations of S. zeamais”
t0“Maize Weevil (Sitophilus zeamais M.)”
Claim · model-written summary
The highest oil dosage yielded low grain weight loss and seed damage.
- Treatment
- highest dosage of the leaf oil extracte0
- Interactor
- Sitophilus zeamaisSitophilus zeamaist0pest
- Outcome
- weight loss and seed damagee0
- Direction
- lowe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evoked low weight loss and seed damage on grains treated with the highest dosage of the leaf oil extract”
t0“Maize Weevil (Sitophilus zeamais M.)”
Claim · model-written summary
P. guajava oil was the most effective treatment, causing 100% weevil mortality after five days.
- Treatment
- P. guajavae0
- Interactor
- S. zeamaisSitophilus zeamaise0pest
- Outcome
- mortality of S. zeamaise0
- Direction
- most effectivee0
- Value
- 100%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. guajava was found to be the most effective, recording 100% mortality of S. zeamais after five days”
t0“Maize Weevil (Sitophilus zeamais M.)”
Claim · model-written summary
P. guajava oil had a lower LC50 of 1.94 µml/L.
- Interactor
- Sitophilus zeamaisSitophilus zeamaist0pest
- Outcome
- LC50 valuee0
- Direction
- lowere0
- Value
- 1.94 µml/Le0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lower LC50 value (1.94 µml/L)”
t0“Maize Weevil (Sitophilus zeamais M.)”
Claim · model-written summary
P. guajava oil produced lower F1 and F2 emergence of 0.000 ± 0.000.
- Interactor
- Sitophilus zeamaisSitophilus zeamaist0pest
- Outcome
- F1 and F2 emergencee0
- Direction
- lowere0
- Value
- 0.000 ± 0.000e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lower F1 and F2 emergence (0.000 ± 0.000)”
t0“Maize Weevil (Sitophilus zeamais M.)”
Claim · model-written summary
P. guajava oil resulted in lower grain weight loss of 1.00%.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lower percentage weight loss (1.00%)”
t0“Maize Weevil (Sitophilus zeamais M.)”
Claim · model-written summary
P. guajava oil resulted in lower seed damage of 11%.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lower percentage seed damage (11%)”
t0“Maize Weevil (Sitophilus zeamais M.)”
Claim · model-written summary
P. guajava oil produced higher grain viability of 50%.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher viability (50%)”
t0“Maize Weevil (Sitophilus zeamais M.)”
The same questions in other papers
botanical · Sitophilus zeamais · Zea mays (maize)Positive and negative results
112 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- negative
113 papers more in this group
See all 117 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.