RANDALL BENTON/rbenton@sacbee.com

Working from a motorized barge, a crew cleans water hyacinth around the entrance to Perry's Marina in Isleton. If left unchecked in summer, the weed forms a solid mat that can clog propellers, rudders and water intakes and discourage boating. That's what happened last year, when an annual herbicide spraying program was delayed until September, after explosive summer growth.

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