Citrus greening recently turned up in Texas at a commercial grove in the Hidalgo County town of San Juan, east of McAllen.
Today, officials announced they have placed a section of Hidalgo County under temporary quarantine.
They're surveying the area to figure out how far the disease may have spread.
Citrus greening attacks a plant's vascular system and can cause a tree to die within a few years.
It only affects the tree, and not the fruit the tree produces. It poses no threat to human health.
But if it spreads here like it did in Florida, it could have a significant impact on the state's citrus crop. Texas is second-in-the-nation in grapefruit production and ranks third in producing oranges.