An invasive grass-eating pest, the pasture mealybug, has been confirmed in Georgia, posing a serious threat to the state's agricultural sector. Georgia Agriculture Commissioner Tyler Harper recently announced that the insect was spotted at a turf business in Decatur County in August. This detection follows the pest's initial confirmation in Texas last October, with it since spreading across the Southeast.
According to Commissioner Harper, the pasture mealybug can spread rapidly and decimate grass, potentially causing substantial financial losses for farmers and underscoring the critical need for enhanced biosecurity measures. The pest's ability to kill grass is a major concern for cattle ranchers and other producers who rely on healthy grazing lands and hay fields. The University of Georgia (UGA) reports that beef was Georgia's second most valuable farm commodity in 2024, generating $1.2 billion for the economy. Farmers are already grappling with recent droughts and increased costs for fuel and fertilizer, and the U.S. cattle herd is currently at its lowest point since the 1950s.
The pasture mealybug is native to Southeast Asia. Researchers believe the insects likely hitched a ride on storm winds from the Caribbean, where they had established a presence by around 2020. Female pasture mealybugs are described as wingless and appear white and fluffy, while males are gnat-like, possess wings, but do not feed in their adult stage, living only a few days. These pests are prolific, capable of producing up to 100 offspring at a time and completing three generations in a single year. They damage plants by sucking out sap, injecting toxic saliva, and producing a thick honeydew that fosters mold growth. Signs of an infestation, such as yellowing leaves that progress to purple or red discoloration and plant death, can appear within a week.
Beyond livestock, the mealybugs also threaten crops that are types of grass, including rice and sugarcane. Lisa Baxter, a professor at the University of Georgia’s College of Agricultural and Environmental Sciences specializing in crop and soil sciences, stated that researchers still know "very little about it overall, since it is relatively new to the United States." However, existing literature suggests that any warm season grass, including pastures, hay fields, lawns, sod farms, seed farms, and even grain crops like corn and wheat, could be affected.
Adding to the challenge, scientists and farmers currently lack knowledge about which pesticides might be effective against these new invaders. Baxter confirmed that researchers are testing existing products, and if an effective solution is identified, it could receive temporary approval. Until then, prevention is key. Young mealybugs can be carried by wind or hitch rides on animals, including humans, attaching to clothes, tools, and vehicles. Baxter emphasized the importance of farmworkers taking precautions to slow the spread, such as keeping people, animals, and equipment clean when moving between farms, limiting traffic through agricultural operations, and continuously monitoring fields. She also advised self-quarantining infected areas and thoroughly cleaning equipment and boots when moving from an infected to a non-infected area.
UGA entomology professor Shimat Joseph indicated that while much remains unknown about the mealybug's full impact in the U.S., it is likely to cause problems for pasture growers, commercial sod and turf farms, and those cultivating ornamental grasses. Turfgrass alone represented a $284 million business in Georgia in 2024, according to UGA. Joseph expressed hope, based on infestations in other countries like Australia, that the mealybugs may not pose a major threat to residential lawns, parks, or golf courses if the grass is regularly mowed and kept short. However, he noted that more information specific to the U.S. context will become available over time.
