Brassica – Diamondback Moth
Insect(s): Diamondback Moth
- To help prevent the development of resistance to any one specific active ingredient (see table below), observe the following instructions:
a. Use in accordance with the current IRMS for your region.
b. 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.
c. 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.
d. 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.
e. Incorporate IPM techniques into the overall pest management program and
f. 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.
- Be aware of insecticide mode of actions used in the nursery phase of the crop and ensure a one generation break exists before re-use of that same mode of action in the field phase of the crop.
- 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) sprays and avoid broad spectrum insecticides, particularly early to mid-crop cycle.
- Be cautious of using insecticide tank-mixes where both active ingredients control DBM 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 good crop hygiene to reduce DBM pressure- plant clean seedlings and incorporate crop residue as soon as practical after harvest.
|Mode of Action Group as specified on the product labeled on product label||Active ingredient||Number applications permitted per crop per season from product label
|1A||methomyl, thiodicarb||Not specified
|2B||fipronil||4 per year within 8 week period
|3A||synthetic pyrethroids (various)||Not specified
|6||emamectin benzoate||4 per year
|11A||Bacillus thuringiensis||not specified
|13||chlorfenapyr||2 but 4 in brussel sprouts
|28||chlorantraniliprole, flubendiamide||3 but 1 for mixtures of chlorantraniliprole and thiamethoxam
Content last updated: June 22, 2018