ORIGINAL RESEARCH
Efficacy of some Acaricides Against Tetranychus
urticae Koch on Phaseolus vulgaris Plants
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1
Plant Protection Research Institute, Agricultural Research Center, Egypt
2
Pesticides Chemistry and Toxicology Department, Faculty of Agriculture Kafer El Sheikh University, Egypt
3
Department of Biology, College of Science, Princess Nourah bint Abdulrahman University,
P.O. Box 84428, Riyadh 11671, Saudi Arabia
4
Biology Department, University College of Tayma, University of Tabuk, Tabuk 47512, Saudi Arabia
5
Department of Chemistry, College of Science, King Faisal University, Al-Ahsa 31982, Saudi Arabia
6
EPCRS Excellence Center, Plant Pathology and Biotechnology Lab.,
Faculty of Agriculture, Kafrelsheikh University, 33516, Egypt
Submission date: 2025-02-10
Final revision date: 2025-03-24
Acceptance date: 2025-05-17
Online publication date: 2025-07-21
Corresponding author
Khaled Abdelaal
EPCRS Excellence Center, Plant Pathology and Biotechnology Laboratory, Agricultural Botany Department, Faculty of Agriculture, Kafrelsheikh University, 33516, Egypt, Egypt
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ABSTRACT
Overcoming the bulk of the challenges posed by using ordinary pesticides necessitates employing
developed, safe, distinctive, and selective chemicals. Because of their clear mechanism of action on
pests and lower toxicity to vertebrates than traditional pesticides, the effects of the new reducedrisk
acaricides abamectin, fenpyroximate, and chlorfenapyr against the two-spotted spider mite,
Tetranychus urticae Koch, were evaluated under laboratory and field conditions. The effects
on development and life table parameters were also studied under laboratory conditions. Abamectin
was the most toxic to T. urticae females, followed by fenpyroximate and chlorfenapyr with LC50 values
of 0.01, 19.86, and 29.66 mg a.i./L, respectively. Under field conditions, abamectin, fenpyroximate,
and chlorfenapyr, respectively, caused a significant difference in the mean reduction percentage
of T. urticae on Phaseolus vulgaris in 2020 (92.83, 86.57, and 80.43); nevertheless, in 2021
the differences were not significant (86.85, 80.38, and 76.13). Fenpyroximate-treated females had
the highest egg, total immature, and postoviposition durations. Females treated with abamectin showed
the longest durations of deutonymph, preoviposition, and female longevity. Chlorfenapyr was the most
effective in reducing the net reproductive rate, intrinsic rate of natural increase, finite rate of increase,
and female sex ratio. The present study revealed that these acaricides (abamectin, fenpyroximate,
and chlorfenapyr) can alternatively be used for effective and sustainable management of the mites.