Sorghum, Maize, Summer Grain Legumes – Heliothis/Cotton bollworm/Native budworm (Helicoverpa spp.)
Crop: Sorghum, Maize, Summer Grain Legumes
Insect(s): Heliothis/Cotton bollworm/Native budworm (Helicoverpa spp.)
- To help prevent the development of resistance to any one specific active ingredient (see table below), observe the following instructions:
- Use in accordance with the current IRMS for your region.
- Apply a specific active ingredient using a “window” approach to avoid exposure of consecutive insect pest generations to the same mode of action. Multiple successive applications of a specific active ingredient are acceptable if they are used to treat a single pest generation.
- Following a “window” of a specific mode of action product, rotate to a “window” of applications of effective insecticides with a different mode of action.
- The total exposure period of any one mode of action “active window” applied throughout the crop cycle (from seedling to harvest) should not exceed 50% of the crop cycle.
- Incorporate IPM techniques into the overall pest management program and
- Monitor insect populations for loss of field efficacy.
- Always read and follow product labels. Some products place a limit on the number of times they can be applied per crop (see table below) and when they can be applied.
- Monitor crops regularly and only apply insecticide when the pest threshold is reached.
- Ensure spray rig is properly calibrated and achieving good coverage with appropriate sized spray droplets.
- Time the application to the most susceptible life stage of the target pest.
- To encourage beneficial insects, use Bacillus thuringiensis (Bt) or NPV sprays and avoid broad spectrum insecticides where possible, particularly early to mid-crop cycle.
- Be cautious of using insecticide tank-mixes where both active ingredients control Helicoverpa spp. as this strategy is generally not considered best practice for resistance management. Refer to document IRAC International Insecticide Mixture Statement for more information on this subject.
- DO NOT re-treat a spray failure with a product from the same chemical group.
- Practice effective pupae busting as soon as practicable after harvest.
|Mode of Action Group as specified on product label||Active ingredient||Number applications permitted per crop per season from product label||Labelled crops
|1A||methomyl, thiodicarb||not specified||All cereal grains, oilseed, pulses
|3A||synthetic pyrethroids (various)||not specified||All cereal grains, oilseed, pulses
|6||emamectin benzoate||2||All pulses
|11A||Bacillus thuringiensis||not specified||All cereal grains, oilseed, pulses
|22A||indoxacarb||1||chickpea, faba bean, mung bean, soybean, azuki bean
|28||chlorantraniliprole||Refer to label||All pulses
|Not Categorised||Nucleopolyhedrovirus (NPV)||no limit but avoid season long use of low rates||All cereal grains, oilseed, pulses
For more information refer to the IPM Guidelines H. armigera RMS for Australian grains: https://ipmguidelinesforgrains.com.au/ipm-information/resistance-management-strategies/#heli
Notes regarding the application of insecticides:
- To ensure the most effective control of the pest:
- Product labels should at all times be carefully read and adhered to;
- Full recommended rates of registered insecticides should always be used; and
- Ensure good coverage of the target area to maximise contact.
Content last updated: June 10, 2020