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<p>Round the year cultivation coupled with large-scale adoption of hybrids in the changing climate scenario has modified the pest-spectrum in tomato crop. Whiteflies are persistent and wide spread pests in India. Recently in addition to <i>Bemisia tabaci</i> which is a well-established key whitefly pest, Maharashtra has witnessed emerging threats in the form of the <i>Solanum</i> whitefly (<i>Aleurothrixus trachoides</i>) in Solanaceous vegetables. In order to understand shifting pest-spectrum in the changing climate scenario, population abundance of these two major whitefly species of tomato was monitored over a period of two years; and their seasonal pattern, fluctuation in their relative abundance and correlation with weather factors was determined. The population of <i>A. trachoides</i> reaches &gt; 80% during July-November while <i>B. tabaci</i> populations were recorded at &gt; 80% around March – April. Decomposition of the species population on monthly time series indicated clear annual cycles where in <i>B. tabaci</i> was dominant in dry months (Dec–Feb), while <i>A.trachoides</i> peaks during the monsoon months (Jul–Sep), and then declines in dry seasons indicating the seasonal niche partitioning. The population abundance of <i>B. tabaci</i> versus <i>A.trachoides</i> showed highly significant negative correlation (<i>r</i> ≈ −&#xa0;0.98) with each other. Moderate negative correlation (<i>r</i> ≈ −&#xa0;0.48) was observed between rainfall versus <i>B. tabaci</i>. While, the correlation between rainfall versus <i>A.trochoids)</i> was moderately positive (<i>r</i> ≈ 0.47) indicating that <i>B.tabaci</i> is less abundant during rainy season, while <i>A. trachoides</i> is more abundant in wetter months. The observed cyclic variation suggests the need for considering such variation while designing future whitefly pest-management strategies in solanaceous crops. Particularly whitefly pest-management strategies using targeted species-specific techniques like RNAi, which may not be effective for overall whitefly management if such interactions are overlooked.</p>

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Inter-species temporal variation in whiteflies Bemisia tabaci and Aleurothrixus trachoides in tomato

  • 期刊论文

  • 发表日期：

    2026年4月17日

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  • Krishnappa Chandrashekar,
  • Abhishek Verma,
  • Gagana Kumar Mahapatro

摘要

Round the year cultivation coupled with large-scale adoption of hybrids in the changing climate scenario has modified the pest-spectrum in tomato crop. Whiteflies are persistent and wide spread pests in India. Recently in addition to Bemisia tabaci which is a well-established key whitefly pest, Maharashtra has witnessed emerging threats in the form of the Solanum whitefly (Aleurothrixus trachoides) in Solanaceous vegetables. In order to understand shifting pest-spectrum in the changing climate scenario, population abundance of these two major whitefly species of tomato was monitored over a period of two years; and their seasonal pattern, fluctuation in their relative abundance and correlation with weather factors was determined. The population of A. trachoides reaches > 80% during July-November while B. tabaci populations were recorded at > 80% around March – April. Decomposition of the species population on monthly time series indicated clear annual cycles where in B. tabaci was dominant in dry months (Dec–Feb), while A.trachoides peaks during the monsoon months (Jul–Sep), and then declines in dry seasons indicating the seasonal niche partitioning. The population abundance of B. tabaci versus A.trachoides showed highly significant negative correlation (r ≈ − 0.98) with each other. Moderate negative correlation (r ≈ − 0.48) was observed between rainfall versus B. tabaci. While, the correlation between rainfall versus A.trochoids) was moderately positive (r ≈ 0.47) indicating that B.tabaci is less abundant during rainy season, while A. trachoides is more abundant in wetter months. The observed cyclic variation suggests the need for considering such variation while designing future whitefly pest-management strategies in solanaceous crops. Particularly whitefly pest-management strategies using targeted species-specific techniques like RNAi, which may not be effective for overall whitefly management if such interactions are overlooked.