2025-2026 Quick Reference Guide to Preemergence/Residual Herbicides for Citrus Weed Control

Indaziflam^e

Alion

L (29)

12

7

X

X

Do not apply Alion within 30 days prior to planting or within 30 days after planting citrus trees.

5–6.5 oz.

Bromacil

Hyvar X 80 WP

C1 (5)

12

—

X

X

X

Do not use on deep-sandy, ridge soil types.

Trees 4 years and older: 2–4 lb. Trees 1–3 years old: 2-3 lb.

Bromacil & Diuron

Krovar I DF

C1, C2 (5, 5)

12

X

X

X

Do not use on deep-sandy, ridge soil types.

Trees 3 years and older: 4–6 lb. Trees 1–3 years old: 2–4 lb.

Diuron

Diuron 80DF

C2 (5)

12

X

X

Foliage contacted by diuron may develop a bleached or bronzed appearance.

2–4 lb.

Diuron

Direx/Diuron 4L

C2 (5)

12

—

X

X

Trees 4 years and older: 80 days between sequential applications.

Trees less than 4 years: 60 days between sequential applications.

1.6–3.2 qt.

Diuron

Karmex 80DF

C2 (5)

12

—

X

X

Trees 4 years and older: 80 days between sequential applications.

Trees less than 4 years: 60 days between sequential applications.

2–4 lb.

Norflurazon

Solicam 80DF

F1 (12)

12

30

X

X

X

For best results apply prior to weed emergence.

2.5–5 lb.

Norflurazon

Solicam 80DF Water Ring treatment

F1 (12)

12

30

X

X

X

Apply at second or third watering, not during the planting operation.

2.3 oz. per 500 gal. water Apply 10 gal. per tree assuming a ring diameter of 4 ft.

Norflurazon

Solicam 80DF Chemical injection through low-volume subcanopy irrigation systems

F1 (12)

12

30

X

X

X

Rate per acre should be based on measurements of area wetted by emitters and number of emitters per acre. See product label for calibration procedures. CAUTION: To be used only through irrigation systems which meet State requirements for chemical injection.

2–3 lb.

Oryzalin

Oryalin 4 AS Surflan 4 AS

K1 (3)

24

—

X

X

Does not control perennial grasses or sedges. Apply prior to weed emergence.

0.5–1.5 gal.

Oryzalin

Oryalin 4 AS Surflan 4 AS

Chemical injection through low-volume subcanopy irrigation systems

K1 (3)

—

—

X

Apply prior to weed emergence. CAUTION: Use only through irrigation systems that meet state requirements for chemical injection.

No more than 1.5 gal. of oryzalin per year.

See label for specific instructions on calculating the product rates.

Pendimethaline

Prowl 3.3EC

K1 (3)

—

—

X

Nonbearing citrus only.

2.4–4.8 qt.

Pendimethalin

Prowl H2O

K1 (3)

24

1

X

Rain or irrigation required within 21 days to move pendimethalin into the zone of weed seed germination.

2.1–6.3 pt.

Simazine

Caliber 90WDG

C1 (5)

12

1

X

X

Oranges and grapefruit only.

4.4 lb. (spring and/or fall) or a single application

of 8.8 lb. in the spring applied once per 12 months.

Simazine

Princep 4L

C1 (5)

12

1

X

X

Avoid application during summer rainy period.

1.0 gal. (spring and/or fall) or a single application of 2.0 gal. in the spring once per 12 months.

Simazine

Simazine 4L

C1 (5)

12

1

X

X

Avoid application during summer rainy period.

1.0–2.0 gal.

2 gal. in spring (Ridge), 3.2 qt. in bedded groves; apply only once per year.

Simazine

Simazine 90DF

C1 (5)

12

1

X

X

Avoid application during summer rainy period.

4.4 lb. (spring and/or fall) or a single application

of 8.8 lb. in the spring applied once per 12 months.

Flumioxazin

Chateau EZ

E (14)

12

3

X

X

X

Do not apply to trees established less than 1 year unless protected from spray contact by nonporous wrap.

Do not make a sequential application within 30 days of first application.

Do not apply to farm alleys or roads.

6–12 oz.

Maximum rate of 24 oz. per 12-month period.

^a All listed pesticides are registered and trademarked products.

^b Mode of action class (MOA) for herbicides from the Herbicide Resistance Action Committee (HRAC). Weed Science Society of America (WSSA) classification is provided in the parentheses.

^c Restricted Entry Interval

^d Preharvest Interval

^e Active ingredient