2,4-D + flumioxazin (Panther D)
Rate 0.5 lb ae/A 2,4-D + 0.0325 lb ai/A flumioxazin (1 pint/A product)
Time Make directed applications to row middles. Apply 1 pint/A each application, 30 day treatment interval.
Remarks Do not apply more than 1 pint/A in a single application. Do not apply more than 3 pints/A during a cropping season. Do not add an adjuvant. Controls numerous broadleaf weeds. Preharvest interval is 30 days.
Caution Do not allow spray to contact green stems, foliage, flowers, or cones because unacceptable injury may occur. Avoid spray or drift outside the area. Do not mow or rake over treated area as dust created by mowing may drift onto sensitive crops or vegetation and damage crop foliage.
Site of action (2,4-D) Group 4: synthetic auxin; (flumioxazin) Group 14: protoporphyrinogen oxidase inhibitor
Chemical family (2,4-D) Phenoxy acetic acid; (flumioxazin) N-phenylphthalimide derivative
2,4-D (several trade names)
Rate 0.48 lb ae/A (1 pint/A product)
Time Apply when annual broadleaf weeds are small.
Remarks Controls susceptible broadleaf weeds. Make directed applications to the row middles. Make up to three applications with at least 30 days between treatments.
Caution Avoid contact with new hop foliage and apical buds. Do not exceed 1.43 lb ae/A (3 pints product/A) per year crop cycle. Preharvest interval is 28 days. Avoid spray drift outside the target area.
Site of action Group 4: synthetic auxin
Chemical family Phenoxy acetic acid
carfentrazone (Aim EC)
Rate 0.03 lb ai/A (2 fl oz/A product)
Time Apply to emerged weeds up to 4 inches tall.
Remarks Apply using shielded sprayers or hooded sprayers to control emerged and actively growing broadleaf weeds within or between the rows of the crop. Apply in at least 20 gal of spray solution. Allow 14 days between treatments. Use a nonionic surfactant with at least 80% ai at 2 pints/100 gal of spray solution or a quality crop oil concentrate at recommended rates. Controls only susceptible broadleaf weeds less than 4 inches tall or across. Do not apply within 7 days of harvest.
Caution Do not let spray contact green portions of plant, because injury may result. Do not exceed 0.119 lb ai/A (7.6 fl oz/A product) per season. Avoid spray or drift outside the area.
Site of action Group 14: protoporphyrinogen oxidase (PPO) inhibitor
Chemical family Triazolinone
clopyralid (Stinger, Spur)
Rate 0.125 to 0.25 lb ae/A (0.33 to 0.67 pint/A product)
Time Apply after training when the growing points of the hop plants are above the spray zone.
Remarks Special local needs labels ID-040011, OR-040038, and WA-040008 for Stinger. Clopyralid has a narrow spectrum of weeds controlled and controls many weeds in the sunflower (e.g., Canada thistle, marestail), legume (e.g., clover), and smartweed families. Hops may show some transient, minor leaf cupping where the spray contacts the lower leaves and suckers on treated plants. Test within a small area before treating the entire hop yard. The grower assumes all risk of crop injury, yield reduction, and crop loss. If a second application is required, the re-treatment interval is 21 days.
Caution Do not apply broadcast more than twice per crop per year. Do not exceed 0.25 lb ae/A per year. Preharvest interval is 30 days. Do not compost treated vegetation if compost will be used on sensitive species.
Site of action Group 4: synthetic auxin
Chemical family Pyridine
pyraflufen (Venue)
Rate 0.0040 to 0.0053 lb ai/A (3 to 4 fl oz/A)
Time Apply a minimum of 20 GPA for listed broadleaf weeds and sucker control. Direct applications to the basal 2 ft of vines or trained bines that are at least 6 ft tall.
Remarks Apply in at least 20 gal/A water. Higher water volumes are recommended for difficult to control weeds. Add crop oil concentrate to spray mix at 1% to 2% v/v.
Caution Do not apply more than two times per season. Allow 30 days between applications. Preharvest interval is 30 days. Follow all safety precautions on the label.
Site of action Group 14: protoporphyrinogen oxidase (PPO) inhibitor
Chemical family Phenylpyrazole