Abstract
The rice weevil Sitophilus oryzae (L.) (Coleoptera: Curculionidae), is an important pest of stored grains throughout the world. Different biopesticides and synthetic insecticides have been used for a long time to minimize the rice weevil infestation but their efficacy is not satisfactory yet. The climate and storage conditions are highly favorable for quick progeny which may be responsible for lower efficiency of insecticides and higher level of infestation. Insect growth regulators (IGRs) like buprofezin are the semi-synthetic insecticides, mimic the insectproduced hormones and don’t kill the insects directly but reduces pest populations by affecting mating behavior, reproduction, egg viability, pre and post embryonic development etc. Laboratory experiments were conducted from August to November 2012, to evaluate the efficacy of buprofezin on the mortality and the suppression of progeny production of rice weevil. Ten adult rice weevils were exposed on three types of rice grains (long, medium and short) treated with buprofezin at 100, 200 and 300 ppm. Mortality was counted at 15, 21 and 28 days after treatment while adult progeny was counted at 6, 7 and 8 weeks after buprofezin treatment to get a new generation. The data showed that buprofezin had no direct effect on the mortality of rice weevils regardless the concentrations. Buprofezin at 300 ppm in rice grains significantly inhibited progeny production while lower doses (200 and 100 ppm) had no significant effect but virtually reduces progeny number. Types of grains were not factor for increasing or decreasing the rice weevils populations. In conclusion, buprofezin caused decreasing progeny productivity by S. oryzae (L.) with increasing concentrations regardless the types of rice grains.
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Claims 6
Claim · model-written summary
Buprofezin did not directly affect rice weevil mortality at the tested concentrations.
- Treatment
- buprofezine0
- Interactor
- rice weevils
Sitophilus oryzaee0pest - Outcome
- mortality of rice weevilse0
- Direction
- no direct effecte0
Not reportedTaxonComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“buprofezin had no direct effect on the mortality of rice weevils regardless the concentrations”
Claim · model-written summary
Buprofezin at 300 ppm significantly inhibited rice weevil progeny production.
- Taxon
- rice
Oryza sativae0 - Treatment
- Buprofezin at 300 ppme0
- Outcome
- progeny productione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Buprofezin at 300 ppm in rice grains significantly inhibited progeny production”
Claim · model-written summary
Buprofezin at 200 ppm showed no significant effect on progeny production but reduced progeny number.
Not reportedTaxonComparator
Verbatim
e0“lower doses (200 and 100 ppm) had no significant effect but virtually reduces progeny number”
Claim · model-written summary
Buprofezin at 100 ppm showed no significant effect on progeny production but reduced progeny number.
Not reportedTaxonComparator
Verbatim
e0“lower doses (200 and 100 ppm) had no significant effect but virtually reduces progeny number”
Claim · model-written summary
Rice grain type did not increase or decrease rice weevil populations.
- Material
- Types of grainse0
- Interactor
- rice weevilsSitophilus oryzaee0pest
- Outcome
- rice weevils populationse0
- Direction
- not factor for increasing or decreasinge0
Not reportedTaxon
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Types of grains were not factor for increasing or decreasing the rice weevils populations”
Claim · model-written summary
Rice weevil progeny productivity declined as buprofezin concentration increased, regardless of rice grain type.
- Taxon
- riceOryza sativae0
- Treatment
- buprofezine0
- Interactor
- S. oryzae (L.)Sitophilus oryzaee0pest
- Outcome
- progeny productivity by S. oryzae (L.)e0
- Direction
- decreasinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“buprofezin caused decreasing progeny productivity by S. oryzae (L.) with increasing concentrations regardless the types of rice grains”
The same questions in other papers
buprofezin · pest · Oryza sativa (rice)Positive and negative results
14 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
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See all 16 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.