New Prowl H20 registration for vegetable crops

Growers will want to note for 2013 that Prowl H2O is now labeled for eggplant, green onion and other vegetable crops.

EPA has approved and BASF has issued a revised and updated label for the herbicide Prowl H2O.  The label includes important crop additions, including the fruiting vegetable crop group (eggplants, peppers and tomatoes), and the green onion crop group (green onions, chives, leeks, scallions, bunching onions and green shallots).  The label has been issued too late for much use in 2012, but growers should take note for future years.

For eggplants, peppers and tomatoes, apply Prowl H2O as a preplant incorporated (PPI) or pretransplant treatment prior to transplanting.  It also can be applied as a directed spray after transplanting.  It should not be applied over the top of transplants or young seedlings.  Prowl H2O needs to be rained or watered (0.25 inches) into the soil to be effective.  It should be applied at 1 to 3 pt/acre (0.475 to 1.425 lb ai).  Prowl H2O is a preemergence-only herbicide with no post-emergence activity.  It controls most annual grasses and several broadleaves, including common lambsquarters, common purslane, ladysthumb, pigweeds and spotted spurge.  It does not control composites and is weak on most mustards.

The preharvest interval (PHI) for tomatoes is 21 days and for the other fruiting vegetables the PHI is 70 days.

For green onions and related crops, Prowl H2O should be applied after the 2 leaf stage (LS).  The maximum use rate is 1 qt/acre (0.95 lb ai).  The PHI is 30 days.  Prowl H2O will not control emerged weeds, so other treatments are needed to control germinating weeds up to the onion 2 LS.

The new Prowl H2O label can be downloaded from

Dr. Zandstra’s work is funded in part by MSU‘s AgBioResearch.

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