Paddy Stem Borer Control: Symptoms, Treatment & Best Insecticide Guide

One of the worst pests for growing rice is the paddy stem borer. It is especially damaging during the early monsoon season. The rice stem borer enters the plant's stem and feeds from inside. This completely stops the supply of nutrients to the plant. If not controlled on time, a severe stem borer infestation can cause 30–70% crop loss in paddy.

Farmers should inspect their fields regularly and use the right pest control methods to prevent stem borers from damaging the rice crop.

At Krishi Bhandar, we offer the most effective and trusted insecticides for paddy pest control — delivered directly to farmers across India.

What is Paddy Stem Borer and Why Does It Attack Rice?

The stem borer is a damaging insect that attacks rice plants at different stages of growth. Female moths lay eggs on leaves. When the eggs hatch, the larvae enter the stem and feed from inside. The plant cannot defend itself once larvae bore inside.

Stem Borer Life Cycle in Paddy:

• Female moths lay egg masses on leaf tips or lower leaf surface
• Eggs hatch in 5–7 days under warm, humid conditions
• Young larvae initially feed on leaves, then bore into the stem
• Larvae feed inside the stem for 20–30 days
• They pupate inside the stem before emerging as moths
• A new generation starts every 4–5 weeks

Conditions That Trigger Stem Borer Attack:

• Warm temperature between 25–30°C
• High humidity and standing water in fields
• Dense crop canopy with poor air circulation
• Excess nitrogen application promotes soft stem growth attractive to borers

Symptoms of Stem Borer in Paddy

Farmers can identify stem borer attack by looking for these clear signs across the field:

Key Symptoms:

• Dead heart — central shoot of young plants turns yellow and dies; pulls out easily
• Leaves turning yellow and drying out without visible external damage
• Stem is hollow when cut open — larvae or feeding tunnels visible inside
• White ear heads — empty panicles at flowering stage with no grain formation
• Presence of small entry holes at the base of tillers
• Poor overall plant growth and reduced tillering
• Pin holes visible on leaves in early infestation stage

Damage Caused by Stem Borer in Paddy Crop

Stem borer damages paddy in two critical ways:

1. Dead Heart Damage — Vegetative Stage: At early growth stage, larvae bore into the central tiller and cut off the nutrient supply. The central shoot dries and dies — this is called dead heart. Affected tillers produce no panicles. Heavy dead heart attack directly reduces plant population and tillering.

2. White Ear Damage — Reproductive Stage: At panicle stage, larvae bore into the stem below the panicle. The entire panicle turns white with no grain. This is the most economically damaging stage. White ear attack at 5% or more causes severe yield loss with no recovery possible.

How to Control Stem Borer in Paddy Crop

Cultural Control Methods

Cultural practices reduce stem borer pressure before chemical intervention becomes necessary.

• Maintain proper plant spacing — good air and sunlight penetration reduces pest buildup
• Avoid excess nitrogen fertilizers — high nitrogen promotes soft growth that attracts borers
• Remove and destroy infected plants immediately when dead hearts appear
• Deep ploughing after harvest destroys pupae in crop residue
• Drain fields periodically — breaks favorable conditions for borer development
• Use resistant or tolerant rice varieties where available in your region

Biological Control for Stem Borer in Paddy

Biological methods work best in early stages before infestation reaches ETL.

• Encourage natural parasitoids like Trichogramma japonicum — these attack stem borer eggs
• Release Trichogramma cards @ 50,000 eggs per acre at 25–30 DAS
• Field spiders and other predators help reduce young larval population naturally
• Avoid early broad-spectrum chemical sprays to preserve beneficial insects in the field

Chemical Control — Best Insecticide for Paddy Stem Borer

When stem borer population crosses ETL, chemical spray is the most reliable and fastest control method. Browse our complete range of insecticides and pesticides for paddy on Krishi Bhandar.

The most effective active ingredients for stem borer control in paddy are Chlorantraniliprole, Emamectin Benzoate, Cartap Hydrochloride, Novaluron, Indoxacarb, and Lambda Cyhalothrin.

Dosage Table — Complete Stem Borer Spray Schedule for Paddy

Product	Active Ingredient	Crop Stage	Dose/Acre	Method
FERTAP-GOLD	Chlorantraniliprole 0.4% GR	25 DAS	4 kg	Broadcast in standing water
Emaan	Emamectin Benzoate 5% SG	45 DAS	100 gm	Foliar spray
Tapride	Cartap Hydrochloride 50% SP	45 DAS	400 gm	Foliar spray
Cargar	Chlorantraniliprole 18.5% SC	45 DAS	60 ml	Foliar spray
GHAATAK	Novaluron 5.25% + Emamectin 0.9% SC	65 DAS	350–400 ml	Foliar spray
RAKSHAK	Novaluron 5.25% + Indoxacarb 4.5% SC	75 DAS	330–350 ml	Foliar spray
CUBA	Chlorantraniliprole 9.3% + Lambda 4.6% ZC	80 DAS	100 ml	Foliar spray

Spray Tips:

• Spray in early morning or late evening only
• Ensure good coverage on leaf surface and stem base
• Do not spray during rain or strong wind
• Rotate molecules — never repeat same active ingredient in consecutive sprays
• Follow pre-harvest interval (PHI) as per product label

Prevention Tips for Stem Borer in Paddy

• Inspect paddy fields twice a week from 20 DAS for early egg masses and dead hearts
• Use light traps to monitor adult moth activity at night
• Do not apply excess nitrogen — it attracts stem borer moths
• Remove and burn stubble and crop residue after harvest
• Maintain field sanitation — weeds act as alternate hosts for borers
• Apply first spray on schedule — do not wait for heavy visible damage

Frequently Asked Questions (FAQs)

Q1: What is stem borer in paddy?

Stem borer is a highly destructive insect pest in rice. The larvae bore into the rice stem and feed from inside, cutting off nutrient supply and causing dead heart at vegetative stage or white ear at panicle stage.

Q2: What are the symptoms of yellow stem borer in rice?

Key symptoms are dead hearts in young plants, yellowing and drying of leaves, hollow stems when cut open, and white empty panicles at flowering stage.

Q3: Which is the best insecticide for stem borer in paddy?

Chlorantraniliprole (FERTAP-GOLD) at 25 DAS, Emamectin Benzoate (Emaan), Cartap Hydrochloride (Tapride), and Novaluron + Indoxacarb (RAKSHAK) are highly effective for paddy stem borer control.

Q4: When should insecticide be applied for stem borer in paddy?

Applications are done between 25 DAS and 80 DAS depending on crop stage and infestation level. Start with FERTAP-GOLD at 25 DAS as preventive, followed by foliar sprays from 45 DAS onwards as per the schedule.

Conclusion

Paddy stem borer is one of the most serious threats to rice yield in India. Early identification and a proper spray schedule are the two most critical factors in protecting your crop. For the best range of insecticides for paddy pest control, visit Krishi Bhandar — trusted by 20 lakh+ farmers across India.