ASHDOWN, Ark.—The hydrilla leaf-mining fly from Pakistan or the flea beetle may help keep Millwood Lake from shrinking.

The insects could be part of the solution, but a proposed federal government study will determine the options, said Derick Walker, a natural resource specialist with the Corps of Engineers at Millwood Lake.

“There are a few biological controls we can use and we can also intermix the biological controls with other solutions,” Walker said.

The spread of alligator weeds and hydrilla has created a problem of sedimentation and the depth of the l...

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