Abstract
Rhopalosiphum padi (L.) (Hemiptera: Aphididae) is a devastating pest of wheat worldwide. Beta-cypermethrin is widely used to control piercingsucking pest insects, including R. padi. Field-applied insecticides gradually descend to sublethal concentrations with the passage of time. Sublethal concentrations of insecticide may affect physiology and behavior of pests, potentially leading to pest resurgence. This study investigated potential sublethal effects of beta-cypermethrin and indoxacarb on an experimental population of R. padi. Indoxacarb is a relatively new pesticide with a mechanism of action that is different from that of beta-cypermethrin. The leaf dip method was used to test the acute toxicity of these insecticides to adult aphids, and life tables were constructed to analyze the effects of 2 sublethal concentrations of beta-cypermethrin (B-LC10, B-LC30) and indoxacarb (I-LC10, I-LC30) on the development and reproduction of the F0 and F1 generations of R. padi. Results of these analyses showed that sublethal concentrations of the 2 insecticides can significantly reduce the fecundity and longevity of the F0 generation. Also, sublethal concentrations of both insecticides prolonged the development of nymphs in the subsequent generation. Life table parameters demonstrated that the evaluated insecticides at sublethal concentrations did not stimulate aphid reproductive potential. This information could be important to enable a more effective use of these insecticides in management programs for R. padi.
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Claims 3
Claim · model-written summary
Sublethal concentrations of both insecticides significantly reduced F0 aphid fecundity and longevity.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- sublethal concentrations of the 2 insecticidese0
- Outcome
- fecundity and longevity of the F0 generatione0
- Direction
- reducee0
Not reportedInteractorComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sublethal concentrations of the 2 insecticides can significantly reduce the fecundity and longevity of the F0 generation”
e1“pest of wheat worldwide”
Claim · model-written summary
Sublethal concentrations of both insecticides prolonged aphid nymph development in the subsequent generation.
- Taxon
- wheatTriticum aestivume1
- Treatment
- sublethal concentrations of both insecticidese0
- Outcome
- development of nymphs in the subsequent generatione0
- Direction
- prolongede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sublethal concentrations of both insecticides prolonged the development of nymphs in the subsequent generation”
e1“pest of wheat worldwide”
Claim · model-written summary
The insecticides at sublethal concentrations did not stimulate aphid reproductive potential.
- Taxon
- wheatTriticum aestivume1
- Treatment
- the evaluated insecticides at sublethal concentrationse0
- Outcome
- aphid reproductive potentiale0
- Direction
- did not stimulatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the evaluated insecticides at sublethal concentrations did not stimulate aphid reproductive potential”
e1“pest of wheat worldwide”
The same questions in other papers
insecticide · pest · Triticum aestivum (wheat)Positive and negative results
29 papers in the same direction as this paper · 7 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- no effect
34 papers more in this group
See all 38 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.