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2021 Louisiana Suggested Chemical Weed Management Guide LOUISIANA SUGGESTED CHEMICAL WEED MANAGEMENT GUIDE 2021 Table of Contents

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2021 Louisiana Suggested Chemical Weed Management Guide LOUISIANA SUGGESTED CHEMICAL WEED MANAGEMENT GUIDE 2021 Table of Contents 2021 Louisiana Suggested Chemical Weed Management Guide LOUISIANA SUGGESTED CHEMICAL WEED MANAGEMENT GUIDE 2021 Table of Contents INTRODUCTION ............................................................................................................. 2 Cucurbits (Cucumber, Squash, Watermelon, Pumpkin, Cantaloupe) ..................168 Eggplant ..................................................................................................................................171 WEED RESISTANCE AND HERBICIDE MODE OF ACTION ............... 5 Greens (Collard, Mustard, Turnip) ................................................................................173 GUIDELINES FOR MANAGING WINTER VEGETATION ..................... 10 Garlic ......................................................................................................................................175 Leafy Vegetables (Lettuce, Endive, Escarole, Radicchio) ..........................................178 CORN ...................................................................................................................................... 18 Irish Potato ...........................................................................................................................180 COTTON............................................................................................................................... 26 Okra ........................................................................................................................................184 Onion .....................................................................................................................................185 GRAIN SORGHUM .......................................................................................................... 38 Peppers ..................................................................................................................................188 RICE .......................................................................................................................................... 42 Shallot (Dry Bulbs) ..............................................................................................................192 Southern Pea ........................................................................................................................193 SOYBEANS .......................................................................................................................... 54 Spinach ...................................................................................................................................196 SMALL GRAINS (Wheat, Barley, Oats, Rye) .................................................... 67 Sweet Potato ........................................................................................................................198 Tomatoes ..............................................................................................................................199 SUGARCANE ..................................................................................................................... 72 PASTURE and FORAGES .............................................................................................204 PEANUTS ............................................................................................................................. 101 NONCROPLAND (Perennial, Annual Grass Weeds and Vines) .........................210 HOME GARDENS ............................................................................................................ 104 WOODY PLANTS and FORESTRY .......................................................................213 LAWN and TURF Turfgrass tolerance to selected herbicides ................................................................. 106 AQUATIC WEED MANAGEMENT (Lakes and Ponds) ...................................216 General home lawn weed control ................................................................................. 107 RECROP INTERVALS FOR VARIOUS HERBICIDES ..................................222 FRUIT CROPS CALIBRATION PROCEDURES ................................................................................228 Strawberry ............................................................................................................................ 117 Blackberry (Erect and Trailing Blackberry/Dewberry)............................................. 119 CONVERSION FACTORS ...........................................................................................229 Blueberry............................................................................................................................... 121 NOZZLE TYPES and DRIFT REDUCTION .......................................................230 Citrus ..................................................................................................................................... 124 Grape (Muscadine and Bunch) ........................................................................................ 129 GLOSSARY OF HERBICIDES ....................................................................................234 Mayhaw .................................................................................................................................. 132 Should the registration of a herbicide or certain uses of a herbicide be canceled by federal or Peach ...................................................................................................................................... 134 state agencies, suggestions thus affected herein are no longer applicable. Use of products in this Pecan ...................................................................................................................................... 139 guide does not constitute a guarantee or warranty of the products named and does not signify that these products are approved to the exclusion of comparable products. COMMERCIAL NURSERY and LANDSCAPE .................................................. 145 VEGETABLE CROPS Artichoke .............................................................................................................................. 152 Asparagus .............................................................................................................................. 153 Snap and Lima Beans .......................................................................................................... 156 Beets ....................................................................................................................................... 159 Cole Crops (Cabbage, Cauliflower, Broccoli, Brussels Sprouts) .......................... 161 Carrots .................................................................................................................................. 163 Sweet Corn .......................................................................................................................... 165 2021 Louisiana Suggested Chemical Weed Management Guide 1 LSU AgCenter publication 1565 INTRODUCTION • Mix only the amount of pesticide you need. Do not store diluted pesticide for later use. Herbicide rates are for broadcast application unless specified differently in the table • Always store pesticides in their original containers. Never store pesticide in heading for each crop. Conversion tables are provided to aid in converting large containers that can be confused for food or drink. volumes, such as quarts and gallons, to ounces, tablespoons and teaspoons. • Avoid mixing or applying pesticides near wells or open water. • Refer the pesticide label under “Directions for Use” for more information on Rates of soil-applied herbicides vary according to soil type because soils can affect how to use the pesticide safely and correctly. herbicide activity. The lower rate is for sandy loams (light), intermediate rate for silt • At the completion of pesticide applications, the applicator should triple rinse loams (medium) and the higher rate for clay loam and clay (heavy) soils. In some the spray container. instances, the same rate may be suggested for both medium and heavy soils. RESTRICTED USE PESTICIDES Herbicides should be applied in enough water to assure distribution over the area treated. That amount may vary from 5 to 40 gallons per acre on a broadcast basis. Some of the pesticides or certain uses of pesticides in this publication may be classified Wettable powder formulations require at least 50 mesh screens throughout the spray for restricted use. Those pesticides with restricted use labels will contain information system and nozzle tips with a capacity of 0.2 gallons per minute (GPM) or larger. regarding these restrictions. Be sure to read all labels thoroughly. It is illegal to use any Considerable agitation is necessary to keep wettable powders in suspension. pesticide in a manner that is inconsistent with the label directions. It is unlawful for a Tanks made of aluminum, fiberglass or other corrosion-resistant materials will reduce noncertified applicator to use a pesticide that has been classified with restricted uses. the amount of nozzle clogging. Some herbicides may not be used in unlined steel tanks. Information on pesticide applicator certification programs may be obtained from the Be sure that the water used as the spray solution is free from trash and other foreign LSU AgCenter. material, particularly mud or soil particles. If herbicides are handled or applied improperly or if unused portions are not disposed
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