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Conyza bonariensis glyphosate-resistant: the need for a new approach. Miguel-Angel Sevillano, Juan Trigo, Gabriel Pardo, Jose-Maria Urbano. Huesca, September 6th, 2011. Introduction. Conyza bonariensis. Major weed problem in no-till permanent crops in Spain

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conyza bonariensis glyphosate resistant the need for a new approach

Conyza bonariensis glyphosate-resistant: the need for a new approach.

Miguel-Angel Sevillano, Juan Trigo, Gabriel Pardo, Jose-Maria Urbano

Huesca, September 6th, 2011

introduction

Introduction

Conyza bonariensis

  • Major weed problem in no-till permanent crops in Spain
  • Adapted to develop herbicide resistance:
  • Worldwide (B, C1, D, G)
  • In Spain (C1 (1987), G (2004))

Conyza bonariensis glyphosate-resistant: the need for a new approach.

introduction1

Introduction

Conyza bonariensis

  • Over-reliance on glyphosate increases the problem.

Conyza bonariensis glyphosate-resistant: the need for a new approach.

introduction2

Introduction

Conyza bonariensis

  • Farmers want to have bare soil
  • At least in the line of trees
  • With glyphosate mixtures
  • Which mixtures?

Conyza bonariensis glyphosate-resistant: the need for a new approach.

introduction3

Introduction

MOA that have been proposed to control C. bonariensis

  • Flazasulfuron (B)
  • Terbutilazine (C1)
  • Amitrol (F3)
  • Glyphosate (G)
  • Glufosinate (H)
  • Fluroxipyr (O)
  • MCPA (O)

Conyza bonariensis glyphosate-resistant: the need for a new approach.

introduction4

Localidad 19 (resistente).

T4: Glyphosate (1080 g/ha)

+ Flazasulfuron (50 g/ha)

T2: Glyphosate (1080 g/ha)

Introduction

Since 2004, glyphosate + flazasulfuron is recommended

Conyza bonariensis glyphosate-resistant: the need for a new approach.

introduction5

Introduction

In 2009, control failures are reported in Ecija (Sevilla), after glyphosate + flazasulfuron, in olive farms.

Conyza bonariensis glyphosate-resistant: the need for a new approach.

objectives

Objectives

Confirm glyphosate resistance in Ecija pops

Check for flazasulfuron resistance in Ecija pops

Evaluate the eficacy of:

- Amitrol (F3)

- MCPA (O)

- Fluroxipyr (O)

Conyza bonariensis glyphosate-resistant: the need for a new approach.

material and methods

Material and Methods

5 C. bonariensis pops.

- A: susceptible check (2004)

- B, C, D: Ecija’s pops (2009)

- E: glyphosate resistant check (2004)

5 pops x 10 treatments x 6 reps x 2 (twice)

Conyza bonariensis glyphosate-resistant: the need for a new approach.

material and methods1

Material and Methods

10 treatments:

Conyza bonariensis glyphosate-resistant: the need for a new approach.

material and methods2

Material and Methods

  • Chlorophyll
  • Fitotoxicity
  • Mortality
  • Biomass

Data

Conyza bonariensis glyphosate-resistant: the need for a new approach.

material and methods3

Material and Methods

Dates

*DDS: Days after sowing.

**DDT: Days after trasplanting.

Conyza bonariensis glyphosate-resistant: the need for a new approach.

results

Results

  • Glyphosate
  • B & D pops: glyphosate resistant

Fitotoxicidad 28DDT

Conyza bonariensis glyphosate-resistant: the need for a new approach.

results1

Results

  • Glyphosate
  • Resistant pops survive

Mortalidad 28DDT

Conyza bonariensis glyphosate-resistant: the need for a new approach.

slide15

Results

Fitotoxicidad 28DDT

Mortalidad 28DDT

Flazasulfuron

Lack of eficacy, when applied in postemergence.

There is diferential response, but not resistance.

slide16

Results

Mortalidad 28DDT

Glyphosate + flazasulfuron

Lack of eficacy against resistant pops

slide17

Results

Fitotoxicidad 28DDT

Mortalidad 28DDT

Testigo

MCPA & Fluroxypir

Similar results: relatively good eficacy

No diferential response

Mortality is low

slide18

Results

Mortalidad 28DDT

Fitotoxicidad 28DDT

Glyphosate + auxinics

Increased eficacy

Mortality is not 100%

slide19

Results

Fitotoxicidad 28DDT

Mortalidad 28DDT

Amitrol

Phytotoxic

Low mortality in problematic pops

slide20

Results

Fitotoxicidad 28DDT

Mortalidad 28DDT

Glyphosate + amitrol

Glyphosate + amitrol = amitrol

Low mortality

Not very interesting

slide21

Conclusions

  • Estrategy A:

- Increase herbicide rates

- Add other products to the mixture

  • Estrategy B:

- Are we optimizing the moment ?

- Are we optimizing cultural practices (cover crops) ?

- Have we explored all posibilities of non-chemical control (mechanical, physical, biological) ?

- Can we predict the emergence ?

None of the treatments achieved 100% control

What should we do know?

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