On Jan. 13, the first-known case of citrus greening disease in Texas was confirmed on a Rio Grande Valley orange tree. The tree showed the telltale signs: undersized, discolored fruit and curled, mottled yellow leaves.

The one case in a San Juan grove became 14 trees in two separate groves, and the outbreak brought the Valley’s citrus harvest season to a halt, as the United States Department of Agriculture investigates how far it had spread. After getting the go-ahead, quarantined growers, pressed to move the last of the year’s oranges to market, cautiously resumed harvesting on Feb. 1 ...

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