TY - JOUR
T1 - Insecticide resistance monitoring in whitefly (Bemisia tabaci) (Hemiptera
T2 - Aleyrodidae) in Oman
AU - Shah, Riaz
AU - Al-Sadi, Abdullah Mohammed
AU - Scott, Ian M.
AU - AlRaeesi, Ali
AU - AlJahdhami, Ali Abdullah
N1 - Funding Information:
The authors acknowledge the financial support provided by Sultan Qaboos University, Oman through internal grant ‘IG/AGR/CROP/18/02’.
Publisher Copyright:
© 2020 Korean Society of Applied Entomology
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/12
Y1 - 2020/12
N2 - The sweet potato whitefly, Bemisia tabaci Gennadius, is an important insect pest of many crops including vegetables through direct feeding damage and as a vector of several plant viruses. Intensive use of insecticides has led to the development of insecticide resistance in global B. tabaci populations. This study was conducted to establish susceptibility levels to deltamethrin, thiamethoxam and pyriproxyfen in seven geographically different populations of B. tabaci MEAM1 adults in Oman. All B. tabaci populations showed very low to low level of resistance (2.1–12.3 fold) to deltamethrin. All B. tabaci populations showed no resistance to very low level of resistance to thiamethoxam (2.2–6.2 fold) and pyriproxyfen (2.4–3.5 fold). A likelihood analysis showed the possibility for control failure in two populations (Barka and Salalah) to deltamethrin, however, no possible failure was detected in all populations for thiamethoxam and pyriproxyfen. An insecticide resistance dynamics study in one population (SQU-1) showed a loss in susceptibility to deltamethrin with increase in the LC50 value from 25.1 mg L−1 to 84.5 mg L−1 between 2017 and 2019 resulting in 5.3 fold increase in RF. The study results determined that several B. tabaci populations are at the initial stages of resistance development to deltamethrin and cross-resistance with thiamethoxam and pyriproxyfen. Vegetable farmers in Oman, the Barka and Salalah regions in particular, should be cautious in the repeated use of one class of insecticide alone.
AB - The sweet potato whitefly, Bemisia tabaci Gennadius, is an important insect pest of many crops including vegetables through direct feeding damage and as a vector of several plant viruses. Intensive use of insecticides has led to the development of insecticide resistance in global B. tabaci populations. This study was conducted to establish susceptibility levels to deltamethrin, thiamethoxam and pyriproxyfen in seven geographically different populations of B. tabaci MEAM1 adults in Oman. All B. tabaci populations showed very low to low level of resistance (2.1–12.3 fold) to deltamethrin. All B. tabaci populations showed no resistance to very low level of resistance to thiamethoxam (2.2–6.2 fold) and pyriproxyfen (2.4–3.5 fold). A likelihood analysis showed the possibility for control failure in two populations (Barka and Salalah) to deltamethrin, however, no possible failure was detected in all populations for thiamethoxam and pyriproxyfen. An insecticide resistance dynamics study in one population (SQU-1) showed a loss in susceptibility to deltamethrin with increase in the LC50 value from 25.1 mg L−1 to 84.5 mg L−1 between 2017 and 2019 resulting in 5.3 fold increase in RF. The study results determined that several B. tabaci populations are at the initial stages of resistance development to deltamethrin and cross-resistance with thiamethoxam and pyriproxyfen. Vegetable farmers in Oman, the Barka and Salalah regions in particular, should be cautious in the repeated use of one class of insecticide alone.
KW - Bemisia tabaci
KW - Control failure likelihood
KW - Deltamethrin
KW - Insecticide resistance
KW - Oman
KW - Pyriproxyfen
KW - Thiamethoxam
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U2 - 10.1016/j.aspen.2020.09.018
DO - 10.1016/j.aspen.2020.09.018
M3 - Article
AN - SCOPUS:85094135785
SN - 1226-8615
VL - 23
SP - 1248
EP - 1254
JO - Journal of Asia-Pacific Entomology
JF - Journal of Asia-Pacific Entomology
IS - 4
ER -