Coragen is a chlorantraniliprole-based insecticide used to protect cabbage and other crops from damaging caterpillar pests. Cabbage is particularly vulnerable because larvae can attack the plant from the seedling stage through head formation, removing leaf tissue, contaminating the crop, and reducing the quality of the final harvest.
The value of chlorantraniliprole is not limited to eventually killing the insect. Susceptible larvae typically stop feeding before they die, which can reduce further damage while affected caterpillars are still visible on the plant.
However, results depend on more than the active ingredient alone. You need to identify the pest correctly, target susceptible larval stages, achieve adequate foliage exposure, account for resistance, and follow the registered label for the exact formulation used.
Chlorantraniliprole is an anthranilic diamide insecticide used mainly against caterpillar larvae and other susceptible insect pests.
Anthranilic diamides are a class of insecticides that interfere with calcium regulation in insect muscle cells. Chlorantraniliprole belongs to IRAC Group 28. IRAC stands for the Insecticide Resistance Action Committee, which classifies insecticides according to their mode of action; the specific biological process they disrupt in the pest. Group 28 contains ryanodine receptor modulators, including chlorantraniliprole and several other diamide insecticides.
This mode of action is different from older insecticide groups such as:
Pyrethroids
Organophosphates
Carbamates
This difference helps with resistance management when you switch to an insecticide that works in a genuinely different way, not simply another product from the same IRAC group.
Cabbage can be attacked throughout its growth cycle.
When caterpillars eat too much of a young plant’s leaves, the plant may struggle to grow properly. If they damage the centre where new leaves develop, they can also disrupt the plant’s normal growth. Later in the season, caterpillars can move into overlapping leaves or developing heads, where they become harder to reach and cause damage directly to the marketable portion of the crop.
Typical damage includes:
Small holes or translucent “windowing” in leaves
Skeletonized foliage
Feeding around the growing point
Damage inside folded or overlapping leaves
Delayed or poor head formation
Frass on leaves and heads
Larval contamination
Reduced marketability
Yield loss under severe pressure
Frass is insect waste. Even when feeding damage is limited, visible frass or live larvae inside the cabbage head may make the produce unacceptable for sale.
This is why feeding cessation matters. The sooner a susceptible caterpillar stops eating, the less additional damage it can cause to the leaves, growing point, and forming head.
Chlorantraniliprole is best known for controlling susceptible lepidopteran larvae. Lepidoptera is the insect order that includes moths and butterflies, whose caterpillar stages often cause serious feeding damage.
Current chlorantraniliprole-containing products include cabbage pests such as diamondback moth, cabbage looper, imported cabbageworm, beet armyworm, and other caterpillars, although the approved spectrum varies by formulation.
Diamondback moth larvae commonly feed on the underside of cabbage leaves. Young larvae may scrape away leaf tissue and create window-like patches before larger holes develop.
This pest is especially important because it has a long history of developing resistance to multiple insecticide groups. Resistance to chlorantraniliprole has also been documented in some diamondback moth populations, so local susceptibility cannot be assumed.
Chlorantraniliprole can provide effective control where larvae are young, exposed, and still susceptible.
Cabbage loopers remove larger portions of leaf tissue and may feed within the plant canopy.
Young larvae are usually easier to control than large caterpillars because they consume less foliage, have had less time to move into protected feeding sites, and generally receive effective exposure sooner.
Imported cabbageworm larvae feed openly on leaves and may leave large, irregular holes.
Their green colouring can make them difficult to notice at first. As the infestation develops, feeding damage and frass become more obvious, reducing crop appearance and saleable quality.
Depending on the local product label, chlorantraniliprole may also be registered against pests such as:
Beet armyworm
Fall armyworm
Tobacco cutworm
Cross-striped cabbageworm
Cabbage webworm
Other locally important caterpillar species
Control depends on the species, larval age, feeding location, formulation, and registered use.
Do not assume that chlorantraniliprole will control every cabbage pest. Aphids, thrips, whiteflies, flea beetles, mites, and other non-caterpillar pests may require a different product unless the exact local label specifically includes them.
Chlorantraniliprole activates ryanodine receptors in insect muscle cells.
Ryanodine receptors regulate the release of calcium stored inside the cells. Calcium is essential for normal muscle contraction and movement.
The process occurs in a sequence:
A susceptible larva ingests treated cabbage tissue or receives relevant contact exposure.
Chlorantraniliprole binds to the insect’s ryanodine receptors.
Calcium is released uncontrollably inside the muscle cells.
Normal muscle regulation breaks down.
The larva loses coordination and feeding ability.
Paralysis develops.
The insect eventually dies.
IRAC classifies this effect as Group 28 nerve and muscle action through ryanodine receptor modulation.
The important crop-protection point is that feeding can stop before the caterpillar dies. You may still see affected larvae on the plant, but they may already be lethargic, motionless, or unable to continue damaging the cabbage.
Ingestion of treated foliage is generally the most important exposure route for leaf-feeding caterpillars.
This means actively feeding larvae are the main target. The insect must encounter and consume plant tissue containing an effective residue.
Contact exposure may also contribute, but field performance still depends heavily on placing the insecticide where the pest feeds.
You should account for:
Larvae feeding on leaf undersides
Overlapping cabbage leaves
Protected growing points
Dense developing heads
Hidden feeding sites
New foliage produced after treatment
Some formulations may provide translaminar movement, meaning the active ingredient can move through treated leaf tissue from one surface to the other. Certain application methods may also provide limited redistribution within the plant.
Crop protection can begin relatively quickly after susceptible larvae consume treated tissue because feeding declines before mortality is complete.
Affected caterpillars may:
Become less active
Stop feeding
Lose normal movement
Become partially or fully paralysed
Remain visible on the plant before dying
Complete mortality is not immediate. Dead larvae may become more noticeable during the following days, depending on:
Pest species
Larval size
Growth stage
Amount of treated tissue consumed
Formulation
Coverage
Temperature
Local pest susceptibility
You should assess fresh feeding damage and larval activity rather than judging performance only by how many dead caterpillars are visible shortly after treatment.
An insect that is still present but no longer feeding may have stopped causing meaningful crop injury. At the same time, active larvae and new feeding damage can indicate inadequate exposure, poor coverage, misidentification, or resistance.
Chlorantraniliprole performs best when the target is a susceptible caterpillar species.
If the real problem is aphids, mites, thrips, beetles, or another pest outside the label spectrum, poor results may have little to do with product quality.
Inspect the pest itself as well as the damage pattern.
Young larvae are generally easier to control than large, established caterpillars.
Early treatment also reduces the chance that larvae will move into folded leaves or developing cabbage heads, where exposure becomes more difficult.
Monitoring for eggs, newly hatched larvae, and early feeding damage allows you to respond before the population becomes severe.
A late rescue treatment cannot reverse leaf loss, contamination, or head damage that has already occurred.
Cabbage is a challenging crop to cover because it has:
Waxy leaf surfaces
Overlapping foliage
Leaf undersides used as feeding sites
Protected central growth
Dense heads
Rapid new-leaf production
If feeding sites remain untreated, larvae may continue feeding even when the visible outer leaves receive good coverage.
Field performance may be affected by:
Rainfall
Irrigation
Temperature
Sunlight
Pest pressure
Rapid leaf expansion
Crop growth after treatment
Newly developed leaves may carry less protection than foliage present during application.
Exact rain-free periods, application conditions, and restrictions must come from the registered label. General guidance should not replace product-specific directions.
Chlorantraniliprole can provide useful residual protection against susceptible caterpillar larvae, but the practical duration is not fixed.
Under some conditions, protection may extend for roughly one to two weeks. However, you should not treat this as a guaranteed interval or automatic spray schedule.
Residual performance depends on:
Formulation
Application method
Foliage coverage
Rainfall and irrigation
Sunlight
Temperature
Pest pressure
New leaf growth
Larval susceptibility
Product-label conditions
Rapidly growing cabbage may produce new, less-protected foliage. Heavy pest pressure can also shorten the period during which one treatment appears adequate.
Regular scouting remains necessary even when the product has residual activity.
Chlorantraniliprole may be particularly useful when young diamondback moth larvae are detected before severe damage develops.
However, diamondback moth resistance has been reported in multiple regions. A history of poor diamide performance in the area should influence your decision.
When susceptible larvae are actively feeding on treated foliage, chlorantraniliprole can reduce further injury by stopping feeding before death.
This can be especially valuable during vegetative growth and early head formation.
Performance may be less consistent when larvae are already large, protected deep inside foliage, or feeding within developing heads.
The insecticide cannot repair existing damage or remove contamination already present.
Cabbage fields may contain both caterpillars and sucking pests.
If aphids, whiteflies, or thrips are present alongside caterpillars, chlorantraniliprole may not control the entire pest complex unless those pests are listed on the exact product label.
Accurate identification should guide the control program.
Resistance management deserves particular attention in cabbage because diamondback moth can develop resistance rapidly.
Repeated reliance on Group 28 insecticides can select insects that survive and pass resistance traits to later generations.
Important principles include:
Rotate with effective insecticides from genuinely different IRAC groups.
Check active ingredients rather than relying on brand names.
Recognize that several diamide insecticides also belong to Group 28.
Avoid repeated Group 28 exposure across successive pest generations.
Follow label limits on application number and treatment windows.
Target young larvae.
Investigate unexpected survivors before repeating the same chemistry.
IRAC advises against treating successive pest generations with insecticides from the same mode-of-action group.
Switching from chlorantraniliprole to another Group 28 diamide is not true mode-of-action rotation.
Chlorantraniliprole should support a broader integrated pest-management program rather than replace one.
Useful components may include:
Regular crop scouting
Correct pest identification
Monitoring eggs and larval stages
Economic thresholds where available
Pheromone traps for selected moth pests
Removal of crop residues
Control of Brassica weeds and volunteer plants
Crop rotation
Netting or other physical exclusion
Biological insecticides
Conservation of natural enemies
Beneficial organisms may include parasitoid wasps, lacewings, predatory bugs, and spiders.
Preserving these natural enemies can slow pest recovery and reduce the need for repeated insecticide use.
Chlorantraniliprole may be more selective than some broad-spectrum insecticides, but it should not be described as harmless to every beneficial species.
Non-target exposure may occur through:
Residues on foliage
Contaminated prey
Drift
Runoff
Flowering weeds near treated fields
Movement into surface water
You should follow product-specific restrictions concerning pollinators, aquatic organisms, buffer zones, and water protection.
Avoid broad claims such as “bee-safe,” “non-toxic,” or “environmentally friendly” unless they are supported by evidence for the exact formulation and exposure scenario.
Crop safety depends on the registered formulation, crop stage, application method, weather, and compatibility with any tank partners.
Before using or sourcing a product, confirm:
Cabbage registration
Permitted number of applications
Preharvest interval
Maximum residue limits
Destination-market import tolerances
Retailer or export residue standards
Spray and harvest record requirements
A preharvest interval is the minimum required time between the final application and harvest.
There is no single universal interval for all chlorantraniliprole products. The exact requirement must come from the local label.
Potential exposure may occur through:
Skin contact
Eye contact
Accidental ingestion
Spray mist or aerosols
Specific protective measures, re-entry requirements, storage conditions, transport rules, disposal instructions, and emergency information must come from the registered label and Safety Data Sheet.
Toxicological claims should refer to the finished formulation, not only the active ingredient.
Possible causes include:
Incorrect pest identification
Treating a pest outside the product’s main spectrum
Targeting adults instead of susceptible larvae
Treating after caterpillars become large
Larvae already hidden inside heads
Incomplete foliage coverage
Heavy rain after treatment
Rapid growth of untreated leaves
Resistant pest populations
Poor formulation quality
Incorrect storage
Failure to follow the product label
When results are weaker than expected, inspect the field before repeating the treatment. Look for active larvae, fresh feeding, pest stage, coverage gaps, and possible resistance.
Chlorantraniliprole is a Group 28 insecticide that controls susceptible cabbage caterpillars by disrupting calcium regulation in their muscle cells.
Affected larvae lose normal movement and stop feeding before paralysis and death. This early feeding cessation can help protect cabbage leaves, growing points, and developing heads from further injury.
Its effectiveness depends on correct pest identification, early larval targeting, adequate exposure, formulation quality, local susceptibility, and resistance management.
Contact us to discuss your target pests, required formulation, packaging needs, and destination market. Red Sun can help you review available chlorantraniliprole specifications and supporting documentation for your intended use.
It activates insect ryanodine receptors, disrupting calcium regulation in muscle cells. The larva loses muscle control, stops feeding, becomes paralysed, and eventually dies.
Feeding can decline relatively soon after a susceptible larva consumes treated tissue. Complete death occurs later, so affected caterpillars may remain visible after meaningful feeding has stopped.
It can provide effective control where the product is registered and the local population remains susceptible. Resistance has developed in some diamondback moth populations, making rotation and monitoring essential.
Do not assume so. Chlorantraniliprole is primarily used against caterpillar pests. Aphid control depends on the exact formulation and whether aphids are listed on the local product label.
Residual protection may last around one to two weeks under some conditions, but the actual duration depends on formulation, crop growth, weather, coverage, pest pressure, and label conditions.
Yes. Resistance has been documented, particularly in diamondback moth. Repeated Group 28 use increases selection pressure.
It may be more selective than some broad-spectrum insecticides, but it is not harmless to every beneficial organism. You must follow label restrictions for pollinators, aquatic species, drift, and non-target exposure.
