Insecticide resistance monitoring in whitefly (Bemisia tabaci) (Hemiptera: Aleyrodidae) in Oman

Riaz Shah*, Abdullah Mohammed Al-Sadi, Ian M. Scott, Ali AlRaeesi, Ali Abdullah AlJahdhami

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1248-1254
Number of pages7
JournalJournal of Asia-Pacific Entomology
Issue number4
Publication statusPublished - Dec 2020
Externally publishedYes


  • Bemisia tabaci
  • Control failure likelihood
  • Deltamethrin
  • Insecticide resistance
  • Oman
  • Pyriproxyfen
  • Thiamethoxam

ASJC Scopus subject areas

  • Insect Science


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