Rice farmers know this frustration well — you’ve done everything right, then a stem borer infestation wipes out an entire season’s work in silence. That’s why Chlorantraniliprole has become one of the most trusted tools in modern rice production.
It’s precise. It’s effective. Used the right way, it protects your crop without damaging the surrounding ecosystem. But “used the right way” carries a lot of weight. The right formulation, the right timing — these details make or break your results.
This guide covers it all: target pests, dosage rates, application methods, and safety intervals. Use it to make clear, confident decisions in the field.
Introduction to Chlorantraniliprole for Rice
Chlorantraniliprole isn’t new — but the science behind it keeps getting more interesting the closer you look.
At its core, chlorantraniliprole is a diamide insecticide. It works by activating ryanodine receptors in insect muscle cells. This triggers uncontrolled muscle contraction and leads to paralysis. What sets it apart in rice production isn’t just that it works — it’s how well it works, even at lower application rates.
Seed treatment studies showed it could cut rice water weevil (Lissorhoptrus oryzophilus) larvae densities at rates 75% below the standard label rate — and still outperform untreated controls. That’s not a small margin. That’s a different category of efficacy.
It targets the pests that matter most in rice fields:
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Rice water weevil — suppressed through both seed and foliar treatments
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Stem borers (yellow stem borer, leaf folder) — injury reduced by 57.9–96.5% in documented trials
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Fall armyworm and sugarcane borer — larval mortality rates stayed higher than controls across all tested rates
The yield numbers back this up. Fields treated with chlorantraniliprole 0.40% GR reached 58.8 q/ha. Untreated plots came in at just 40.3 q/ha. That gap translates straight into income for growers.
This is what precision protection looks like in practice.
Targeted Pests in Rice Fields
Rice loses, on average, 37% of its yield to pests and diseases every single season. Not in the worst-case scenario — on average. That number alone explains why pest identification isn’t a background task. It’s the whole job.
Chlorantraniliprole targets the insects that drive the biggest losses in rice fields. Here’s what you’re dealing with.
The Primary Threats
Stem Borers (White Stem Borer & Yellow Stem Borer)
These are the quiet destroyers. Visible damage shows up late — deadhearts in the vegetative stage, whiteheads at grain fill. By then, easy intervention is no longer an option. In Indramayu district, coordinated nursery planting pushed white stem borer incidence below 5%. Neighboring areas without that coordination sat at 25%. Timing and coordination are everything.
Brown Planthopper (Nilaparvata lugens) BPH ranks as the most damaging rice pest in Asia. A single outbreak in Indonesia between 1985 and 1986 destroyed 275,000 hectares of rice. What makes BPH so difficult is its adaptability. It has built resistance to multiple common insecticides. Heavy insecticide use on high-yielding variety (HYV) rice can even trigger resurgence — it wipes out natural predators, which gives BPH room to bounce back stronger.
White-Backed Planthopper
This pest behaves much like BPH. It has also built resistance to many standard chemical controls. That’s why targeted insecticides like chlorantraniliprole are becoming more critical in rotation strategies — they give you effective control without accelerating resistance.
True Armyworms
Armyworm pressure spikes under specific conditions: weedy fields, excess nitrogen, and dense canopies. The monitoring threshold is simple — step in when more than 10% of panicles show damage.
Why Precise Targeting Matters
Rice makes up 12% of all pesticide use worldwide — with 80% of that concentrated in Asia. Farmers in IPM Farmer Field Schools cut their spray frequency from 2.8 applications per season to fewer than one. The reason? They learned to identify exactly which pest they were managing before reaching for a sprayer.
That precision is where chlorantraniliprole proves its value. It controls the pests that drive real losses. And it does that without harming the spiders, parasitic wasps, and ground beetles already working to protect the crop.
Formulations of Chlorantraniliprole for Rice
Not all formulations work the same way — and in rice production, that difference matters.
Chlorantraniliprole comes in two main forms for rice: 18.5% SC (Suspension concentrate) and 0.4% G (Granules). Each fits a different part of the season. Used together, they deliver stronger results than either one alone.
The Two Core Formulations
0.4% Granules (G) — Apply at 10 kg/ha. Granules are your early-season base. You put them down at transplanting — either in the seedbed 7 days before uprooting, or in the main field at 30 days after transplanting (DAT). The slow-release design keeps the active ingredient working as the plant takes root and grows.
18.5% SC — This liquid concentrate comes in at the mid-season stage. Apply at 150 mL/ha (or 3.0 mL per 10 L water) around 50 DAT. It takes over from the granules and targets pests during the reproductive stages — a critical window for protecting yield.
Why the Combination Works
Kharif rice trial data shows what sequential application delivers:
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Dead heart incidence at 30 DAT: as low as 0.51–0.65% in granule-treated plots
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At 60 DAT, combined G + SC treatments kept dead heart damage to just 3.66%
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Whitehead percentages dropped to 0.38–1.30% — the lowest across all treatments
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Grain yield was highest in plots that received 0.4% G in the main field, followed by an 18.5% SC spray
Spider populations are worth paying attention to here. Granule-treated plots recorded 1.5–1.8 spiders per hill — higher than any other treatment. Your natural pest control stays active and intact.
A Note on Emerging Formulation Technology
Researchers are testing nanosuspension formulations against the standard 18.5% SC. The gap in performance is notable. Nanosuspensions achieved 55.9% higher retention on rice leaves, with no change to grain protein content. This technology is not yet in wide commercial use — but it points to where precision application is going next.
Residue Behavior You Should Know
Chlorantraniliprole breaks down well in the field. Soil half-life runs 13–16 days, depending on the growing season. By harvest, residues in straw, husk, and brown rice fall below detectable limits. That’s a useful fact for anyone handling food safety compliance or managing export requirements.
Application Rates of Chlorantraniliprole in Rice
Here’s something that surprises most growers: you can apply chlorantraniliprole at 75% below the standard label rate and still get real control of rice water weevil. That finding comes from Louisiana State University. It changes how we think about “enough.”
Let’s look at the actual numbers. The details tell a fuller story.
Seed Treatment Rates
LSU researchers tested five rates against rice water weevil: 0.25×, 0.5×, 0.75×, 1×, and 2× the standard label rate. Every rate reduced larval densities by 68.6–90.3% compared to untreated controls. No rate outperformed the others. That’s a strong result. It tells us the insecticide has a wide efficacy window. Rate adjustments don’t break the performance.
The two most common seed treatment rates in practice are 20.37 g ai/100 kg seed and 24.37 g ai/100 kg seed. Here’s what those rates deliver under different weevil pressure levels:
|
Rate (g ai/100 kg seed) |
Larval Density (no./core) |
Yield (kg/ha) |
|---|---|---|
|
20.37 — low pressure |
1.00 ± 0.45 |
14,218 ± 454 |
|
24.37 — low pressure |
0.50 ± 0.16 |
14,652 ± 430 |
|
20.37 — high pressure |
7.64 ± 1.08 |
12,614 ± 284 |
|
24.37 — high pressure |
6.45 ± 1.90 |
13,263 ± 192 |
The higher rate pays off under heavy infestation — fewer larvae, better yield. Under low pressure, the gap between rates gets much smaller. The lower rate holds its own.
Seed treatment is the go-to choice across the region. About 80% of southwest Louisiana rice acres use chlorantraniliprole seed treatment. Growers see weevil reduction of 72–96% per season.
Foliar and Granule Rates
Weevil populations sometimes need control even after planting. Vantacor 5SC at 1.7 fl oz/acre, applied preplant as a foliar treatment, pulls densities down — from 9.7 per sample in untreated fields to 6.3 in treated ones. That’s a clear, measurable drop.
For granule applications, Ferterra 0.4 GR is the standard soil option. Trials have tested it head-to-head against Coragen 18.5% SC foliar treatments. Both deliver control. Your choice comes down to timing and what application equipment you already have on hand.
What Rate Should You Choose?
Pressure level drives the decision. Here’s a simple breakdown:
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Low weevil pressure — The lower seed rate (20.37 g ai/100 kg) holds up well. You protect your input costs without losing meaningful control.
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High weevil pressure — Step up to 24.37 g ai/100 kg. Pair it with a foliar application at the right growth stage for stronger results.
The data backs both paths. What it doesn’t back is a fixed rate applied the same way across every field, no matter the conditions.
Application Methods for Chlorantraniliprole in Rice
Three methods. One insecticide. The results change based on which path you choose — and when you apply it.
Chlorantraniliprole reaches rice crops through seed treatment, granule application, and foliar spray. Each method fits a different point in the growing season. Getting the timing right is what turns a good outcome into a great one.
Seed Treatment
Most growers start here — and for good reason.
Lumivia 625g/L FS applied at 90 g a.i./ha cuts stem borer incidence by 76.71% in kharif and 68.60% in rabi seasons. Even at a quarter of the standard label rate, weevil larval densities drop 72–96% compared to untreated controls. The non-treated plots saw yield losses of 39.9%. That’s not a rounding error. That’s an entire season gone.
Fall armyworm mortality tells a similar story. At 72 hours post-feeding:
– 0.25× rate → 74% mortality
– 0.5× rate → 93% mortality
– 0.75× and above → 100% mortality
Yields showed no real difference between rates from 0.25× to 2×. All of them beat untreated plots. So the minimum rate for solid protection is lower than most growers think.
Granule Application
Granules give you a steady, soil-level release during the most at-risk early weeks.
Two placement timings stand out:
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Seedbed application (7 days before uprooting) followed by a main field spray gave the lowest dead heart incidence overall — averaging just 1.19%, and 1.34% at 60 DAT
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Main field granules at transplanting combined with a chlorantraniliprole spray at 50 DAT held dead heart damage to 3.66% at 60 DAT, with leaf folder incidence at just 0.38% WM by 45 DAT
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The granule-plus-spray combo delivered the highest grain yields across trial plots, time after time
Foliar Spray
Foliar spray works best at 22–35 days after permanent flood establishment. At that window, it cut Crambidae whitehead damage by 34.1–39.3% compared to pyrethroid options and untreated controls.
The 18.5% SC formulation at 150 mL/ha handles this stage well. Think of it as the follow-through shot — it finishes what granules or seed treatments started.
Your choice of method shapes everything that follows. Seed treatment takes care of early-season pressure. Granules hold the line through mid-season. Foliar spray closes the gap at reproductive stages. Together, they give chlorantraniliprole the reach it needs to cover a full season.
Application Guidelines for Chlorantraniliprole in Rice
Knowing the rules gives you confidence. Not just the general idea — the specific numbers that hold a season together.
Here they are.
Rate and Frequency
The foliar application rate is 125 g ai/100 L. In the field, that works out to 24.5–31.5 g ai/ha. Two foliar applications per crop is the maximum. No more than that.
Between applications, wait at least 7 days. That gap isn’t random. It keeps resistance pressure under control and holds residue levels where they need to be.
For ground rigs, use a minimum spray volume of 80 L/ha. Aerial applications can drop to 30 L/ha — a real reduction in volume. But coverage quality still depends on weather conditions and how well your equipment is calibrated.
Timing Is the Variable That Changes Everything
Spray before or at the pest threshold of 10–12 larvae per m². That number is your line. Go past it without spraying, and you’re playing catch-up.
Target newly-hatched larvae. They’re the most vulnerable stage. That’s where chlorantraniliprole works best and your input goes furthest.
So start monitoring early — look for eggs and young larvae from the beginning of the season. Don’t wait for visible crop damage before you act.
Pre-Harvest Intervals and Residue Compliance
The withholding period before harvest is 14 days. This applies to both grain and grazing/stock food use. Mark that date on the calendar before you spray — not after.
Eight Brazilian trials used a single application at 30 g ai/ha. The highest grain residue recorded was 0.16 mg/kg — well below the temporary MRL of 0.3 mg/kg for rice grain.
Here’s how processing affects residue levels:
|
Commodity |
Processing Factor |
|---|---|
|
Polished rice |
0.11× |
|
Rice bran |
1.7× |
|
Rice hulls |
3.2× (HR-P: 0.51 mg/kg; MRL: 0.7 mg/kg) |
Rice straw and fodder carry an animal feed MRL of 10 mg/kg. Rice hulls sit at 0.7 mg/kg. Your operation uses any downstream feed? These numbers go in your compliance file.
One Small Step Worth Getting Right
For seed treatments, tumble seeds for a full 10 minutes. That’s what it takes to get complete coating. It’s easy to cut this step short — and easy to regret it later.
Withholding Periods and Residue Limits for Chlorantraniliprole in Rice
Fourteen days. That’s the gap between your last application and a safe harvest — covering both grain and grazing.
Simple enough. But that number comes with a detailed residue picture. Know it well, especially with strict market compliance on the line.
What the Residue Data Shows
Eight Brazilian trials ran chlorantraniliprole at 30 g ai/ha — the standard proposed rate. Researchers measured grain residues at 13–15 days post-harvest. Results: <0.01, 0.02, 0.03, 0.10, 0.13, 0.13, 0.16, and 0.16 mg/kg.
A Philippine trial used a higher rate — 40 g ai/ha, with three applications. At 15 days, residues still came in at 0.165 mg/kg.
The supervised trials median residue (STMR) across the full dataset: 0.12 mg/kg.
MRLs by Market — Know Where You’re Selling
|
Market |
Rice Grain MRL |
|---|---|
|
Temporary (OECD) |
0.3–0.4 mg/kg |
|
Australia |
0.15 mg/kg |
|
USA |
0.15 mg/kg |
|
Taiwan |
0.1 mg/kg |
Rice hulls have a separate MRL of 0.7 mg/kg. Estimated processed residues reach 0.51 mg/kg — within limits.
How Fast Does It Break Down?
Fast. Soil half-life at twice the labeled rate is just 16 days. Water half-life runs under one day. Rice straw clears in about 3.5 days. Vegetation dissipation wraps up within 4 days.
Processing changes how residues are spread. Polished rice holds 0.11× of the original level. Rice bran concentrates at 1.7×. Hulls reach 3.2×. Your operation uses milling byproducts as animal feed? Put those numbers in your compliance file now.
Healthy rice fields don’t happen by accident. They’re the result of smart decisions made at the right moment.
Chlorantraniliprole is a powerful tool against stem borers and leaf folders. These pests destroy yields season after season — often before you notice the damage. The tool only works when you use it right. That means the correct rate, the right timing, and the right method. Residue limits and withholding periods matter too. Respect them.
Precision beats guesswork every time. Match your formulation to your application method. Follow the guidelines. Your rice crop will show the difference at harvest — in numbers you can measure.
Now it’s your turn. Walk your fields. Find your pressure points. Then put what you’ve learned here into action.
At the end of the season, the gap between an average yield and a great one often comes down to one well-timed, well-informed choice.
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