Table 7.9. Herbicides approved for managing weeds in cucurbit crops. (continued)
Labels change frequently. Be sure to read a current product label before applying any chemical.
Active ingredient Trade name MOA
lb. a.i./A product/A code Crops Weeds controlled / remarks
Clethodim (Arrow, Intensity, Select) 2 EC 1 Cucumber, squash, melons,
0.94 - 0.13 6 - 8 oz. spray volume. Use nonionic surfactant in Select Max. PHI 14 days.
and all commodies in crop
group
Annual and perennial grass control. Use a crop oil concentrate at 1% v/v
(Select Max) 1 EC
0.07 - 0.13
DCPA (Dacthal) W 75 3 Muskmelon, cantaloupe,
honeydew, watermelon
Annual grasses and certain broadleaf control. Apply only when plants
have 4 - 5 true leaves, are well-established, and growing conditions are
favorable for good plant growth. Cultivate prior to application to control
emerged weeds.
4.5 - 10.5 6 - 14 lb.
(Dacthal) 6 F
6 - 14 pt.
Clomazone
(Strategy) 3 + 13 Cucumber, melon, summer
2 - 3 pt. middles only. Does not control emerged weeds. PHI 45 days
& winter squash, pumpkin,
watermelon
Annual broadleaf and grass control. After transplanting apply to row
Glyphosate (various formulations) 9 All cucurbits Control emerged broadleaf and grass weeds. Apply to row middles
only. Use a hooded sprayer to reduce drift. Consult individual labels for
restrictions.
consult labels
Halosulfuron (Sandea) 75 DF 2 Cucumber, cantaloupe,
honeydew, crenshaw melon
Apply after the 3-5 true leaf stage (no sooner than 14 days after
application if a PRE application was made. Cucumber PHI 30 days.
Cantaloupe, honeydew, crenshaw 57 days.
0.04 - 0.05 0.5 - 1 oz.
Halosulfuron (Sandea) 75 DF 2 Watermelon, summer
sqaush
Nutsedge and broadleaf weeds. Apply to the row middles only. Include
a NIS in the spray solution. PHI 57 days in watermelon. PHI 30 days for
summer/winter squash and pumpkin.
0.02 - 0.05 0.5 - 1.0 oz.
0.02 - 0.04 0.5 - 0.75 oz. Pumpkin, winter squash
Imazosufuron (League) 75 WG 2 Muskmelon, watermelon Nutsedge and broadleaf weeds. No more than 6.4 oz/A/yr. One application
per years. Surfactant is needed if weeds are emerged. Row middles only.
PHI 45 days
0..19 - 0.3 4 - 6.4 oz.
Paraquat (Gramoxone) 2 SL 22 Cucumber, muskmelon,
cantaloupe, pumpkin,
squash, watermelon
Controls emerged weeds. Row middles only. Limit of 3 applications
per year. Gramoxone SL is a supplemental label consult labels for other
paraquat formulations. Consult label for new restrictions.
0.47 - 0.93 1.88 - 3.72
Pe largonic acid (Scythe) 4.2 EC 27 Cucumber, gourd,
muskmelon, cantaloupe,
pumpkin, squash,
watermelon
Controls emerged weeds. Row middles only. Use a shielded sprayer
3 - 10% v/v directed to the row middles to reduce drift to the crop.
Pendimethalin (Prowl H20) 3 Cantaloupe, citron melon,
muskmelon, watermelon
Annual broadleaf and grass weeds. Apply to the row middles only. Apply
2.1 pt./A after transplanting or seeding and before vines are off the bed
and in the spray area. If a preplant application was applied do not exceed
4.2 pt./A per season. PHI 35 days.
1 2.1 pt.
S-metolachlor (Brawl, Dual Magnum) 7.62
EC
15 Pumpkin Annual broadleaf and grass weeds and nutsedge. Apply as inter-row or
inter-hill application. Leave a 1 ft. untreated area over the plant (6 in.
on either side of the row). Use lower rates on lighter soils. Apply before
0.95 - 1.26 1.0 - 1.33 pt. weeds emerge. PHI 30 days.
Sethoxydim (Poast) 1.5 EC 1 All cucurbits
decreased if weeds are under stress. Use 1 pt. for seedling grasses and
1.5 pt. on perennial grasses. PHI 14 days.
0.19 - 0.28 1.0 - 1.5 pt.
Terbacil (Sinbar) 80 WP 5 Watermelon Annual broadleaf weeds. Apply to row middles only. Do not allow contact
0.1 - 0.2 2 - 4 oz. with plant foliage. Do not exceed 4 oz. per year. PHI 70 days.
3 All cucurbits Annual broadleaf and grass control. Apply after crop is 3 to 4 true leaf
1.0 pt stage. Row middles only. PHI 30 days except for watermelon 60 days.
5 lb.
*** POSTHARVEST ***
Diquat (Reglone Dessicant) 22 Cantaloupe Minimum of 35 gal./A. Include a NIS. Thorough coverage is required.
0.25 1.0 pt
Diquat (Reglone Dessicant) 22 Cucumber, watermelon,
squash (except acorn)
Minimum of 35 gal./A. Include a NIS. Thorough coverage is required.
0.38 1.5 pt
Diquat (Reglone Dessicant) 22 Squash (acorn) Minimum of 35 gal./A. Include a NIS. Thorough coverage is required.
0.5 2.0 pt
2019 Vegetable Production Handbook of Florida 59