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2020 Vegetable County Update

Stanley Culpepper
Professor and Extension Weed Specialist
University of Georgia

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TABLE OF CONTENTS

Weed Management Update Agenda New Labels Expected Labels --- Soon What did we lose? 2020 Fumigant Systems For Weeds Cool Research Cool Research Liberty Directed Rely Applied Over Mulch Bareground - preplant Transplant Cucumber Response to Rely Cool Research Cool Research Transplant Cucumber Response to PowerMax Vegetable Transplant Injury From PowerMax at 64 oz/A Applied Preplant Bareground. Yellow squash response to 64 oz/A of PowerMax II Preplant Roundup Over Mulch Prior to Transplant Roundup PMAX 64 oz/A Applied Over Mulch Followed by 0.5" Irrigation Before Transplant Influencing Injury Potential Cole crop response to Roundup preplant Influencing Injury Potential Planter Example of Planter Type Influencing Vegetable Herbicide Injury Example of Planter Type Influencing Weed Control New RU PMAX II Label - Transplants Residual herbicides are key in crop. Cool Research Herbicide residues remaning on plastic mulch averaged over 15, 30, and 45 DAA timings Squash Response to Dicamba Squash Response to 2,4-D Broccoli/Collard Response to 2,4-D Preplant Cooperation And Education Support by the Vegetable Commodity Commission Makes These Efforts Possible

SLIDE CONTENTS

Weed Management Update Agenda 1. What’s new 2. What’s gone 3. Cool stuff!!! New Labels Select Max -- okra Select Max – green onions Expected Labels --- Soon Reflex -- sweet potato Reflex – eggplant What did we lose? Paladin Fumigant 2020 Fumigant Systems For Weeds Paladin Pic + Metam TIF T2/Pic/Metam* TIF 4. T2/Pic/Metam LDPE 5. Pic Chlor 60 TIF 3. Paladin Pic TIF All common weeds Good nutsedge, watch grass and pigweed Watch nutsedge, good grass and pigweed Watch nutsedge, grass, and pigweed… ...nematodes?? *UGA 3-WAY: system of Telone II, Pic, Metam Cool Research No Label Currently; Hopefully BASF Wont Back Out On Us Cool Research No Label Currently; Hopefully BASF Wont Back Out On Us Row middles in plastic production Prepare to plant in bareground Prepare to plant in mulch Liberty Directed Rely Row Middle Rely Directed ¼ X rate Rely Topical Row - Middle NOT washed washed Rely Applied Over Mulch Huge Concern for Transplants Bareground – preplant Transplant Cucumber Response to Rely None 7 DBP 4 DBP 1 DBP 48 oz/A Rely Injury 20 DAP. Tifton, GA. 2018. DBP = days before planting. POSTER Cool Research No residual activity so plant what and when you want? Comes off plastic easy! Cool Research No residual activity so plant what and when you want? Comes off plastic easy! Transplant Cucumber Response to PowerMax None 7 DBP 4 DBP 1 DBP Injury 14 DAT; Tifton. GA 2018. DBP = days before planting. 64 oz/A PowerMax Vegetable Transplant Injury From PowerMax at 64 oz/A Applied Preplant Bareground. Cantaloupe 51 69 % 43 Eggplant Cucumber Pepper Squash Tomato Watermelon 53 41 55 48 Injury 21 DAP. Tifton, GA. 2019. Herbicide applied 3 d before transplant. Yellow squash response to 64 oz/A of PowerMax II Preplant Non-treated Roundup Over Mulch Prior to Transplant We know you have to wash off with 0.5” in single event What happens when the Roundup ends up in an old hole Roundup PMAX 64 oz/A Applied Over Mulch Followed by 0.5” Irrigation Before Transplant Old hole present when spray New hole after spray/irrigation Influencing Injury Potential Soil – sand, organic matter Rate Tillage Irrigation Non-treated RU PMAX + Irrigation + tillage Cole crop response to Roundup preplant Influencing Injury Potential Soil – sand, organic matter Rate Tillage Irrigation Transplanting method Example of Planter Type Influencing Vegetable Herbicide Injury Herbicide Rate Increasing Transplanter % Example of Planter Type Influencing Weed Control Herbicide Rate Increasing Transplanter % New RU PMAX II Label – Transplants Soil >85% sand and/or < 0.5% O.M. Bareground: < 32 oz/A > 3 days 0.5” water Mulch: <32 oz/A > 3 days 0.5” water 32 to 64 oz/A >10 days 0.5” water 1. Residual herbicides are key in crop. 2. Between Crops: Max Roundup allowable followed by Gramoxone 5 to 7 d later. Cool Research Not Even Remotely Close to Being Labeled but…………… Can 2,4-D and dicamba be washed from mulch? No Dicamba 45 DBP 30 DBP 15 DBP 1 DBP Squash Response to Dicamba > 1.4 inch of rain for 15 or more days NTC 2,4-D 45 DBP 30 DBP 1 DBP 15 DBP Squash Response to 2,4-D > 1.4 inch of rain for 15 or more days 2,4-D No holes washed 2,4-D Holes washed No Herbicide Broccoli/Collard Response to 2,4-D Preplant Industry Partners Cooperation And Education Georgia Farmers Consultants Industry Partners Cooperation And Education Georgia Farmers Consultants Support by the Vegetable Commodity Commission Makes These Efforts Possible