WEED CONTROL IN CHICKPEA PRODUCTION

Transcription

1 WEED CONTROL IN CHICKPEA PRODUCTION 2017 Far West Winter Conference Matt Renfrow

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3 US Chickpea Production ,500 acres ,000 acres ,000 acres Source: Agricultural Marketing Resource Center

4 Outline Challenges Cultural Practices Grass Weed Control Broadleaf Weed Management Why Do We Fail in Control Measures Preharvest Desiccation

5 Challenges No Post Broadleaf Control Options

6 Challenges Broadleaf Control in a Broadleaf Crop

7 Challenges Residual Chemistry Limited Options Low Use Rates Group 3 Root Pruning on Lambsquarters

8 Challenges Herbicide Carryover Rotational Restrictions

9 Challenges 2017 US Acres by Crop Corn 90,000,000 Soybeans 85,000,000 Wheat 50,000,000 Chickpeas 500,000

10 Challenges Crop Competition

11 Integrated Pest Management Chemical Control Cultural Practices

12 Cultural Practices Crop Rotation

13 Cultural Practices Crop Management Stand Establishment Soil Nutrient Balance / ph Fungicide Seed Treatment Insect Management Seeding Conditions Seed Placement Genetics

14 Cultural Practices Preplant Conditions

15 Chemical Control Herbicide Selection Weed Species

16 Chemical Control Herbicide Selection Tillage Operations

17 Chemical Control Herbicide Selection Rainfall Patterns Herbicide Activation Length of Residual Timing of Applications

18 Chemical Control Herbicide Selection Site of Action

19 Grass Weed Control POST Prior to Bloom Post Plant Pre Emerg Pre-Plant

20 Post Weed Control Grass Common Name Trade Name Site of Action Herbicide Family quizalofop Assure II 1 fop sethoxydim Poast 1 dim clethodim Select 1 dim

21 Pre Plant Grass Residual Common Name Trade Name(s) Herbicide Group General Use triallate Fargo / Avadex 8 Grass ethalfluralin Sonalan 3 Broadleaf / Grass Volatility Fargo / Avadex Sonalan

22 Post Plant Pre Emerg Grass Residual Common Name Trade Name(s) Herbicide Group General Use dimethenamid Outlook 15 Broadleaf / Grass S-metolachlor Dual II Magnum Sequence BroadAxe 15 Broadleaf / Grass Herbicide Mode of Action Rotation

23 Pre Harvest Broadleaf Chemical Control Application Timings Post Plant Pre Emerg Pre Plant

24 Pre-Plant Pre-Plant

25 Pre Plant Burndown Chemical Roundup (glyphosate) Gramoxone (paraquat) Sharpen (saflufenacil)..

26 Pre Plant Broadleaf Residual Common Name Trade Name(s) Herbicide Group General Use imazethapyr Pursuit 2 Broadleaf pendimethalin Prowl H2O 3 Broadleaf ethalfluralin Sonalan 3 Broadleaf / Grass saflufenacil Sharpen 14 Broadleaf

27 Pre Plant Considerations Volatility Sonalan Sharpen Pursuit Prowl H2O Binding Characteristics Pursuit (imazethapyr) Imidazolinone Herbicides are strongly bound to OM at ph <6.5. Reductions in ph as small as 0.2 ph units can double the amount adsorbed.

28 Post-Plant Pre-Emergence Post-Plant Pre-Emerg

29 Post Plant Pre Emerg Residual Common Name Trade Name(s) Site of Action Water Solubility mg/l Half Life days Photodegradation days pendimethalin Prowl H2O metribuzin Sencor non linuron Lorox non flumioxazin Valor non saflufenacil Sharpen sulfentrazone Spartan Spartan Charge BroadAxe non dimethenamid Outlook S-metolachlor Dual II Magnum Sequence BroadAxe

30 Post Plant Pre Emerg Residual Common Name Trade Name(s) Site of Action Water Solubility mg/l Half Life days Photodegradation days pendimethalin Prowl H2O metribuzin Sencor non linuron Lorox non flumioxazin Valor non saflufenacil Sharpen sulfentrazone Spartan Spartan Charge BroadAxe non dimethenamid Outlook S-metolachlor Dual II Magnum Sequence BroadAxe

31 Post Plant Pre Emerg Residual Common Name Trade Name(s) Site of Action Water Solubility mg/l Half Life days Photodegradation days metribuzin Sencor non linuron Lorox non flumioxazin Valor non sulfentrazone Spartan Spartan Charge BroadAxe non saflufenacil Sharpen pendimethalin Prowl H2O dimethenamid Outlook S-metolachlor Dual II Magnum Sequence BroadAxe

32 Common Name Post Plant Pre Emerg Considerations sulfentrazone S-metolachlor Trade Name(s) Spartan Spartan Charge BroadAxe Dual II Magnum Sequence BroadAxe Site of Action Water Solubility mg/l Half Life days Photodegradation days non pendimethalin Prowl H2O linuron Lorox non dimethenamid Outlook metribuzin Sencor non saflufenacil Sharpen flumioxazin Valor non

33 Common Name Post Plant Pre Emerg Considerations Trade Name(s) Site of Action Water Solubility mg/l Half Life days Photodegradation days saflufenacil Sharpen dimethenamid Outlook metribuzin Sencor non S-metolachlor Dual II Magnum Sequence BroadAxe sulfentrazone Spartan Spartan Charge BroadAxe non linuron Lorox non flumioxazin Valor non pendimethalin Prowl H2O

34 Post Plant Pre Emerg Considerations Metribuzin Injury on Spring Peas

35 Post Plant Pre Emerg Considerations Metribuzin Injury on Spring Peas

36 Post Plant Pre Emerg Considerations PPO Injury on Chickpeas

37 Post Plant Pre Emerg Considerations Breakdown prior to next crop

38 Why do we fail in PRE weed control?

39 Why do we fail in PRE weed control? Weed Species Effectiveness Weed Resistance Incorporating Rainfall Timing Stability Weed Emergence Quantity of Moisture Events Capillary Action needed to Bind to OM and Soil Herbicide Mobility Length of Residual

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41 Pre vs Post Timing

42 Lambsquarters Shift in Chemistry Prolific Seed Producer 72,500 seeds per plant AVG Up to 176,000 seeds per plant Seed Dormancy Summer Annual Photo Sensitive Seed Best Management Program Cultural 3 year rotation Chemical PRE

43 Desiccation DESICCATION - Preharvest

44 Why Desiccate Harvest Ability End User Quality Standards

45 Desiccation Common Name Trade Name Site of Action PHI days glyphosate Roundup 9 7 saflufenacil Sharpen 14 3 paraquat Gramoxone 22 7 Always check with processer on end user residue tolerance levels

46 QUESTIONS Matt Renfrow Always read and follow label directions. Individual results can vary from location to location and year to year. All product names are registered trademarks of their respective owners.