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Improving Tree Nut Crop Management Through Effective Weed Control

Preventing Broadleaf Weeds from Obstructing Orchard Floors

In sports, there is nothing like good competition. When it comes to managing orchard floors, competition can be a nightmare, especially when that competition comes from tough-to-control broadleaf weeds.

A weed-free orchard floor is more than visually appealing; it sets the stage for better orchard management throughout the season and improved efficiency at harvest.

Early Control

Tree nut production is challenging enough without having to worry about controlling tough Conyza broadleaf weeds such as hairy fleabane and horseweed, along with other species like prickly lettuce, mallow and filaree. If a herbicide used in a weed control program provides only partial control, regrowth is likely.

“Timing herbicide applications when broadleaf weeds are small is always advised,” said Daniel Abruzzini, Coastal District market development specialist with Corteva Agriscience. “Small, actively growing weeds absorb and more readily transport herbicides throughout the plant than larger weeds. Susceptibility is greater when weeds are small — which increases the chances for control.”

At all costs, prevent weeds from reaching the reproductive stage and heading out, which adds to next year’s seedbank. A single horseweed plant can produce up to 250,000 seeds. Hulk^® CA herbicide with Rinskor^® active is a new and effective Group 4 herbicide offering excellent broadleaf control. Through systemic activity, it controls emerged, susceptible weeds and prevents regrowth.

“This innovative herbicide provides tree nut crop growers with a powerful new solution to manage challenging broadleaf weeds in permanent crops,” Abruzzini said. “Hulk CA herbicide delivers a flexible solution as part of a season-long weed management program and can be used alone or with a tank-mix partner. It also is compatible as part of a preemergence or burndown program in the fall or spring.”

Flexibility

Like weed control in row crops, effective weed management in tree nut orchards should begin early and continue through fruit set and nut development. That creates the need for a herbicide with extended flexibility, not only in application timing but also in tank-mix compatibility. More orchard managers are finding those attributes in Hulk CA herbicide with Rinskor active.

Hulk CA with Rinskor active offers a broad application window for both dormant and non-dormant uses.

For more information, visit Corteva.us/HulkCA or your local Corteva Agriscience representative.

^{™ ®} Trademarks of Corteva Agriscience and its affiliated companies. Hulk® CA is only registered for sale or use in California.  Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your state. Rinskor^® is a registered active ingredient. Always read and follow label directions. ©2025 Corteva.  032171  BR (09/25)  CAAG5HULK055