ORIGINAL ARTICLE
Enhancing toxicity of pyrethroids by oxidase and esterase inhibitors in Spodoptera littoralis (Boisd.) larvae
1
Insect Population Toxicology Department, Central Agricultural Pesticides Laboratory, Agriculture Research Center, Giza, Egypt
A - Research concept and design; B - Collection and/or assembly of data; C - Data analysis and interpretation; D - Writing the article; E - Critical revision of the article; F - Final approval of article
Submission date: 2023-05-22
Acceptance date: 2023-10-18
Online publication date: 2024-04-04
Corresponding author
Seham Mansour Ismail
Insect Population Toxicology Department, Central Agricultural Pesticides Laboratory, Agriculture Research Center, Giza, Egypt
Insect Population Toxicology Department, Central Agricultural Pesticides Laboratory, Agriculture Research Center, Giza, Egypt
HIGHLIGHTS
- ► Piperonyl butoxide (PB) or organophosphorus compounds (OPs) synergised with pyrethroid insecticides against cotton leafworm larvae both in vivo. ► Significantly increased synergism is shown with PB + OPs for pyrethroid insecticides.
KEYWORDS
TOPICS
ABSTRACT
Although pyrethroids are increasingly being used to control a number of agricultural insect
pests, especially the cotton leafworm, Spodoptera littoralis (Boisd.), pyrethroid resistance is
a major obstacle limiting effective control. With the aim of maintaining the effectiveness
of pyrethroids in managing pests, a study was undertaken to evaluated the effectiveness of
oxidase and esterase inhibitors for synergizing pyrethroids in S. littoralis larvae. Compared
with the insecticide-susceptible strain (L-SS) of S. littoralis, the resistance ratio (RR) in
the field population (F-RS) was 271.43–fold to cypermethrin. The use of profenofos as an
esterase inhibitor significantly increased larval susceptibility to cypermethrin in the F-RS
strain, with a synergy ratio (SR) of up to 192.57–fold. Significant inhibition of esterase
by profenofos in the F-RS strain was found in vivo. Also, piperonyl butoxide (PB) as an
oxidase inhibitor had slight effect of cypermethrin toxicity, so its addition is not a solution
for pyrethroid resistance. Thus, modifying the toxicity of cypermethrin by mixing it with
organophosphorus compounds (OPs) increased its toxicity and decreased the population
of S. littoralis, which is a successful strategy for managing pyrethroid resistance.
RESPONSIBLE EDITOR
Paweł Sienkiewicz
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
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| eISSN: | 1899-007X |
| ISSN: | 1427-4345 |
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