From my Backyard to the World: Phenacoccus solenopsis Tinsley, 1898 (Hemiptera: Pseudococcidae) on a Medicinal Plant in Brazil

Nyeppson S. Soares; Roberto A. Zucchi; Thiago H. R. Pádua; Ana L. B. G.  Peronti; Marcoandre Savaris

doi:10.37486/2675-1305.ec08001

Authors

Nyeppson S. Soares Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo, Piracicaba, SP, Brazil https://orcid.org/0000-0002-1296-2368
Roberto A. Zucchi Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo, Piracicaba, SP, Brazil https://orcid.org/0000-0001-9861-7460
Thiago H. R. Pádua Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, SP, Brazil https://orcid.org/0000-0002-5505-4394
Ana L. B. G. Peronti Universidade Federal de São Carlos, São Carlos, SP, Brazil https://orcid.org/0000-0003-1788-0342
Marcoandre Savaris Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, SP, Brazil https://orcid.org/0000-0002-9145-6059

DOI:

https://doi.org/10.37486/2675-1305.ec08001

Keywords:

Dorymyrmex, Lippia alba, Mutualistic interaction, New host plant, Verbenaceae

Abstract

The solenopsis mealybug, Phenacoccus solenopsis Tinsley, 1898 (Hemiptera: Pseudococcidae), is widely distributed globally and is a significant polyphagous pest affecting a variety of plants of agricultural, medicinal, and ornamental value, including certain weeds. In this study, we present, for the first time, the occurrence and damage caused by P. solenopsis on false lemon balm, Lippia alba (Mill.). N.E. Br. ex Britton & P. Wilson (Verbenaceae) in Brazil. Specimens of the solenopsis mealybug were collected and examined on L. alba in a residential area of Floriano city, Piauí state, Brazil, from July to November 2025. The damage caused by the mealybug primarily manifests on the branches of false lemon balm, resulting in yellowing and desiccation, with a comparatively lesser impact on the host’s leaves. Throughout our observations, the solenopsis mealybug population on the host declined by November 2025. This represents the first documented instance of P. solenopsis in Piauí, thereby increasing the total number of Brazilian states reporting occurrences of this pest to 11. Additionally, we noted the mutualistic relationship between P. solenopsis and Dorymyrmex sp. (Hymenoptera: Formicidae: Dolichoderinae). This study also updates information regarding the distribution and host plants of P. solenopsis in Brazil.

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