role of generic pesticides in managing resistance: an updated perspective cpda aic meeting may 2012...

Role of Generic Pesticides

in Managing Resistance:

An updated perspectiveCPDA AIC MeetingMay 2012

Expert Panel Discussion:Bryan Young, Ph.D.Philip Westra, Ph.D.

Jake Brodsgaard

Moderator: Gregory Lindner

Introduction

• Managing the emergence of resistance has been an important part of agriculture for decades

• The problem is not unique to any one pesticide type and has remained relevant to fungicides, insecticides, and herbicides

• So what is different now?

Combination of expanding GMO use with increased reliance on a narrower

range of pesticide actives is fostering emergence of new

resistant pests.

Focus: Fungicide Resistance

Fungicide Resistance Action Committee

Composition: Primarily basic research companies, CropLife

Focus: Insecticide Resistance

Insecticide Resistance Action Committee

Composition: Basic research companies, generics, others

Useful resources with special emphasis on managing resistance in Bt crops

WSSA - Weed Science Society of America

Excellent source for statistical data on resistant weeds

Significant links to sources, databases, and associated websites

Focus: Herbicide Resistance

Herbicide Resistance Action Committee

Composition: Basic research companies, generics

Links closely with WSSA site

International Survey of Resistant Weeds

Source: www.weedscience.org,

Ian Heap, March 2011

Global Distribution of Herbicide Resistance

Source: www.weedscience.org, Ian Heap, March

2011

This figure shows the number of herbicide-resistant biotypes around the world. Biotypes are unique cases of herbicide-resistance in weeds separated by geography. Because of this definition, the number reported by biotype will always be greater than the number reported by weed species.

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Current Status of Resistance

ALS-inhibitors

Triazines

ACCase-inhibitors

Glycines

The legend identifies herbicides by both mechanism of action and class. Mechanism of action (MOA) is the biochemical site within a plant with which a herbicide directly interacts. Herbicide class refers to herbicide chemistry.

[Click to close.]

Source: www.weedscience.org, Ian Heap, March

2011

Glyphosate-Resistant Weeds

March 2012

Sites: Orchards, vineyards, canals, agronomic crops

Weeds: Annuals, perennials, grass, broadleaf Unlike previous herbicide-resistant weeds Potential for rapid spread once developed

Source:

www.weedscience.org, Ian

Heap, March 2011