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<p>The current study documents a significant infestation of <i>Ferrisia virgata</i> (Cockerell) on the green manure crop, <i>Gliricidia sepium</i> (Jacq.) Walp. The leaves of the heavily infested plants exhibit a yellowish tint, gradually desiccate, and ultimately drop off. Two ant species, <i>Anoplolepis gracilipes</i> (Smith) and <i>Crematogaster sp.</i> (Hymenoptera: Formicidae), were observed in association with the mealybug. Additionally, it was noted that two predators, <i>Scymnus spp.</i> and <i>Cheilomenes sexmaculata</i> from the coccinellidae family, were preying on the immature stages of the mealybug. Three essential oils, specifically clove, eucalyptus, and lemongrass, were evaluated for their insecticidal activity against mealybugs. The resulting biological parameters indicated that the LC<sub>50</sub> values for clove, eucalyptus, and lemongrass oils were 2.14, 2.34, and 4.83&#xa0;µl/ml air, respectively, in terms of fumigant toxicity. These findings highlight the potential of essential oil as a component of the integrated pest management strategy of <i>F. virgata</i>.</p>

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Ferrisia virgata (Cockerell): Emerge as a Major Threat to Green Manure Crop, Gliricidia sepium (Jacq.) Walp.

  • 期刊论文

  • 发表日期：

    2026年1月17日

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  • Atanu Seni

摘要

The current study documents a significant infestation of Ferrisia virgata (Cockerell) on the green manure crop, Gliricidia sepium (Jacq.) Walp. The leaves of the heavily infested plants exhibit a yellowish tint, gradually desiccate, and ultimately drop off. Two ant species, Anoplolepis gracilipes (Smith) and Crematogaster sp. (Hymenoptera: Formicidae), were observed in association with the mealybug. Additionally, it was noted that two predators, Scymnus spp. and Cheilomenes sexmaculata from the coccinellidae family, were preying on the immature stages of the mealybug. Three essential oils, specifically clove, eucalyptus, and lemongrass, were evaluated for their insecticidal activity against mealybugs. The resulting biological parameters indicated that the LC50 values for clove, eucalyptus, and lemongrass oils were 2.14, 2.34, and 4.83 µl/ml air, respectively, in terms of fumigant toxicity. These findings highlight the potential of essential oil as a component of the integrated pest management strategy of F. virgata.