The IRAC Plant Biotechnology Working Group has completed a short poster brochure discussing the use of Bt corn to manage fall armyworm, Spodoptera frugiperda, in the Asia-Pacific region. The brochure complements IRAC’s poster and brochure developed in 2021 entitled “Manage fall armyworm in 3 steps”. The 3 steps are 1) Incorporate agronomic actions, 2) Identify pest and decide when to treat, and 3) Control FAW using IRM principles. The main IRM principle relayed in this brochure is the rotation in modes of action across sequential pest generations. While this 3 step process is effective for most countries in the Asia-Pacific region where crop protection tools are readily available, Bt corn is an important tool that also may be used by farmers in much of the Americas as well as in an increasing number of countries where fall armyworm has recently invaded like South Africa, Philippines, Pakistan, and Vietnam.
The Bt corn brochure is entitled “Integrating Bt corn for fall armyworm (FAW) management”. Effective Bt hybrids against fall armyworm are available and we want to ensure that farmers follow insect resistance management guidelines to maximize long-term benefits of the technology. This brochure also discusses a simple 3 step process: 1) Plan, 2) Plant refuge & monitor, and 3) Evaluate & Treat. The purpose is to be proactive in building an Integrated Pest Management (IPM) plan to use multiple tools and tactics against FAW founded on the host-plant resistance provided by Bt traits. Our goal is for farmers to be able to understand what a non-Bt refuge is, why it is important, and how to incorporate it when they plant a Bt corn hybrid. We also advise farmers to scout their fields and determine the need to incorporate additional control tools, such as insecticidal sprays, if indeed economic population levels of FAW arise in their Bt and non-Bt corn fields.
The new brochure is posted here and was developed in conjunction with CropLife International and with feedback from many contributors. If you have questions regarding this educational brochure supported by IRAC, please contact Alan Porter at email@example.com.
The new Global Resistance Management (GRM) Mode of Action App, released earlier this year by the Resistance Action Committees (IRAC, HRAC FRAC), has just been updated with additional features. The App combines the information on the Resistance Action Committee’s standalone Mode of Action Apps into one application for ease of access by the user. The individual IRAC, FRAC and HRAC Mode of Action Apps are still available and all applications can be downloaded from the Apple App and Google Play stores.
For farmers in Vietnam, the agricultural environment is very dynamic. Changes in weather patterns, consumer behavior, the availability of labor, the availability of crop protection products, and the crop pest patterns, require farmers to adjust their agricultural practices to sustain and improve both crop quantity and quality. Badly adopted cultivation practices can lead to increasing problems with insecticide resistance.
Farmers in Vietnam (VN) are experiencing increasing insecticide resistance, rendering their efforts in crop protection inefficient even though they can choose between more than 1500 different insecticide brands, which represent over 600 different active ingredients. If the offer is so diversified, why are farmers running into trouble? The key question is, how to decide which product to use? Interviews with farmers reveal that most believe that they should rotate different products, for insecticide resistance management (IRM).
This shows that farmers are clearly lacking available, essential IRM guidance.
IRAC VN, in association with CropLife VN, are engaging to help farmers to better manage insecticide resistance in the future and planning to:
The latest edition of the scheme, version 10.3, has now been published which includes some minor changes to the earlier versions.
Download the latest Mode of Action Classification.
IRAC MoA Group 30 insecticides (GABA-gated chloride channel allosteric modulators) are a new class of insecticide chemistry with first registrations in agriculture made during 2018. They represent a valuable resource for the control of insect and mite pests in many agricultural and horticultural markets and therefore it is considered essential to develop IRM guidelines to maintain their effectiveness through sustainable use.
The MoA posters with the chemical structures for insecticides/acaricides and for nematicides and the small MoA brochure (now including nematicides) have been updated to correspond with the latest versions of the IRAC MoA Classification. The documents can be downloaded from the website and printed copies will be available in early 2022. The insecticide/acaricide poster is in English but other language version are in preparation.
The general principles of resistance management apply to seed and soil treatments as with foliar applied insecticides, however there are some additional factors that should be considered. There are limited insecticide modes of action available for use either as soil or seed treatments, therefore, the judicious use of the available modes of action is essential for sustainable control of the insect pests targeted by these applications. The updated IRAC guidelines provide more information.
The Chewing Pest WG is a new group for IRAC combining the past Lepidoptera and Coleoptera WGs and complements the Sucking Pest WG. These two key groups sit within the IRAC Crop Protection Team along with the Nematode WG. The team held their first conference call on August 24th 2021, agreed membership and drafted some initial objectives. Further information can be found on the Chewing Pest WG homepage
This advanced module is designed to provide guidance on how to set up a successful resistance management strategy that is sustainable. In addition to technical aspects, this requires a good coordination and collaboration between relevant stakeholders on a community basis. The target audience for this module includes farmers, cooperatives, extension services, distributors, private service providers and public service or researchers in crop protection and plant biotechnology.
Earlier in 2020 the IRAC Sucking Pest WG developed a set of IRM guidelines as a text version. This has now been complemented with a new graphics version. Both the Text Version and the Graphics Version and can be downloaded from the IRAC website.