Agriculture and Natural Resources FACT SHEET

1 Agriculture and Natural Resources fact SHEET . College of Agriculture , Human and Natural Sciences ANR-8. Cooperative Extension Program An Outreach Education Program Serving Limited resource Individuals, Families and Communities HERBACEOUS WEED CONTROL IN. NEWLY PLANTED LOBLOLLY, SLASH and LONG LEAF PINES. By Fitzroy D. Bullock, Extension Professor Small Farm and Integrated Pest Management Don't be fooled, pine trees need to escape from weeds.. There are various herbicides registered for the control of grasses and broadleaf weeds in newly planted pines. The selection and application of any one herbicide or herbicide combination will depend largely on the weed spectrum.

2 The following is a brief insight into the herbicides that are available and how they can be used to give your young pine trees a rapid head start. Remember that the first year of a pine tree's growth is the most important since it is the time that a good root system is established. 1. Atrazine: 2. Imazapyr: AAtrex Nine-0 - Arsenal (Applicators Concentrate) - to AAtrex 4L - 4-8 pts/A 10 fl. ozs/A. Atrazine provides both preemergence and Apply over-the-top or as a directed spray to postemergence activity. Apply in a minimum pines. Apply in at least 25 gallons of water/A. of 10 gallons of water per acre. Application The addition of of a non-ionic surfac- may be made as a directed spray or over the tant by volume will help improve control.

3 This top of pines, but before weeds exceed treatment will provide good control of most inches. This treatment will control many an- grasses and broadleaf weeds and suppression nual grasses and broadleaf weeds. The addition of blackberries/brambles. This treatment is a of an oil concentrate containing 1 percent to 20 good fit in areas where Johnsongrass and Ber- percent surfactant will improve the control of muda grass are serious problems. Arsenal will existing weeds. Use only on loblolly and slash provide both preemergence and postemergence pines. weed control. Use on loblolly pines, 4-8 fl. oz on slash pines and 4-6 fl.

4 Oz. on long leaf pines. Continued on next page Herbaceous Weed Control In Newly Planted Loblolly, Slash and Long Leaf Pines, p. 2 textured soils for the first and second year where brambles and sickle pod are major problems. 3. Metsulfuron: 6. Sulfometuron + Hexaxinone Escort 60 DF - oz/A (for Oust 75 DF - 2-4oz/A. use only on trees established for +. at least one year) Velpar2 L - 2-3pts/A. Apply over-the-top or directed in at Apply in at least 20 gallons of water/A. least 25 gallons of water/A for the con- for the control of many broadleaf trol of many broadleaf weeds. This weeds, vines and small woody plants. treatment is especially good where This treatment is especially good in blackberries/brambles are a areas where sprouts from roots of woody plants might become a serious problem.

5 Do not use a surfactant when problem. treating pine trees that are less than 1. year old. Use only on loblolly and slash pines. 7. Hexazinone + Sulfometuron Oustar 75 DF (Velpar + Oust). 4. Sulfometuron: Apply Oustar to loblolly pines, slash Oust 75 DF - 2-8 ozs/A pines, or long leaf pine seedlings for the control of many grasses and broad- Apply over-the-top or as a directed leaf weeds. Make application of 12-16. spray. Make application in at least 20 to seedlings established for more gallons of water/A to actively growing than one year. Make application in 10- broadleaf weeds (Personal experience 40 gallons per acre.)

6 Do not apply under has shown that 4oz/A is adequate for stress conditions. general broadleaf weeds.). Do not add a surfactant if application is 8. Fluazifop to be made over the top of pines. This Fusilade DX - 16-24 fl. oz/A. treatment provides both preemergence and postemergence weed control. Apply in at least 25 gallons of water per acre. Application should be made over the top of pines and actively grow- 5. Sulfometuron + Atrazine: ing grasses. Always add 1 percent crop Oust - 2-8 ozs/A oil concentrate, or percent of a + non-ionic surfactant by volume. This AAtrex Nine - treatment will give only postemergence or AAtrex 4L - 4-8pts/A control of grassy weeds.

7 A split appli- cation may be necessary for perennial Apply over-the-top or as a directed grasses. Fusilade will not control spray. Make application in at least 20 broadleaf weeds or sedges. Fusilade gallons of water/A to actively growing may be used on all pine species. grasses and broadleaf weeds. This treatment is especially good for coarse Continued on next page Herbaceous Weed Control In Newly Planted Loblolly, Slash and Long Leaf Pines, p. 3 9. Sethoxydim: 12. Glyphosate + Sulfometuron Vantage L - pts/A Accord - 12-24 fl. ozs/A. +. Apply in at least 25 gallons of water to Oust 75 DF - 2-4 ozs/A. actively growing grassy weeds.

8 A split application may be necessary to help Apply in at least 25 gallons of water control perennial grasses. Do not add per acre. Application should be made to surfactant or crop oil to Vantage. This actively growing broadleaf weeds and treatment will not control sedges or grasses. Non-ionic surfactant at broadleaf weeds. percent by volume should be added to help improve control. Do not apply this 10. Clethodim: mixture during rapid candle expansion Envoy 16 fl. oz. per acre when over-the-top application is made. This treatment will control many Apply over the top for control of an- grasses, broadleaves, and sedges and nual and perennial grasses.

9 Make appli- give suppression of blackberries/. cation in enough water for good cover- brambles. Use only on loblolly and age (20-30 gallons per acre). The addi- slash pines. Do not exceed 16 fl. oz. of tion of a crop oil concentrate or a non- Accord on slash pines. ionic surfactant will improve control. This treatment may be used on all pine species. Do not apply under drought conditions. 11. Glyphosate: Accord 4E 12 -24 fl. ozs/A. Apply in no more than 25 gallons of water/A. Application should be made to actively growing weeds. Use of a non-ionic surfactant by volume or fl. oz/A of Entry II to help improve control.

10 Do not apply during rapid can- dle expansion when application is made over-the top of pines. Use only on lob- lolly and slash pines. Do not exceed 16. fl. oz. for slash pines. Continued on back Herbaceous Weed Control In Newly Planted Loblolly, Slash and Long Leaf Pines, p. 4 CONVERSION TABLE FOR HERBICIDES MEASURING TABLES. ON SMALL AREAS FOR HERBICIDES. Rate per Acre Rate per Rate per Herbicides are often bought in large packages or con- 1000 Sq. Ft. 100 Sq. Ft. tainers which do not have specific instructions for mixing smaller amounts to treat small areas. The Liquid Materials following table compares various measurements that are needed to make smaller amounts of spray: 1 pt.