Eggplant fruit and shoot borer (brinjal borer)

Leucinodes orbonalis Guenée, 1854

brinjal shoot and fruit borer · English, South Asia
baingan ka tana aur phal chhedak · Hindi, South Asia
begun er doga o fol chhidrokari poka · Bengali, Bangladesh and eastern India
茄黄斑螟 (qié huáng bān míng) · Chinese, East Asia
penggerek buah terung · Indonesian, Southeast Asia

The most destructive pest of eggplant (brinjal) in South and Southeast Asia. Its pink caterpillars bore into young shoots, which wilt, and into fruit, which become riddled with tunnels and unsaleable. Because larvae spend almost their whole life hidden inside plant tissue, farmers often spray very frequently with little effect; clipping infested shoots, pheromone traps, netting and, in some countries, Bt eggplant work far better.

Adult eggplant fruit and shoot borer moth. Photo: Donald Hobern, CC BY 2.0, via Wikimedia Commons.

Type: Insect · Insect (moth); larva bores shoots and fruit
Classification: Animalia › Insecta › Lepidoptera › Crambidae
Main crops: Eggplant, Potato, Tomato
Found in: South Asia, Southeast Asia, East Asia, Africa, Europe
Chemical groups: IRAC 28, IRAC 5, IRAC 6, IRAC 11A (mode-of-action groups, not products)
Last reviewed: 2026-10-19

Eggplant fruit and shoot borer scientific name, order and family

The scientific name of eggplant fruit and shoot borer is Leucinodes orbonalis Guenée, 1854, in the order Lepidoptera, family Crambidae.

Where it occurs

Widespread in South and Southeast Asia and southern China. Records from Africa were shown in 2015 to belong mostly to other, related Leucinodes species, so the true distribution of L. orbonalis outside Asia is uncertain. It is regularly intercepted in exported eggplant fruit and is a quarantine pest in Europe.

Region	Status
South Asia	Native; key eggplant pest
Southeast Asia	Widespread
East Asia	Present in the south
Africa	Related Leucinodes species cause similar damage; records of L. orbonalis need confirmation
Europe	Absent; quarantine pest intercepted on imported fruit

Symptoms and identification of eggplant fruit and shoot borer

Eggplant fruit cut open to show borer damage. Photo: Chirag85, CC BY-SA 4.0, via Wikimedia Commons.

The organism

Eggs are creamy-white, flat and laid singly on leaves, shoots and flower buds. Larvae are creamy when young and turn pink, with a brown head, reaching about 15-20 mm. The moth is white with pink-brown and black patches on the forewings, about 2-3 cm across, resting with wings spread and the abdomen curved up.

Signs in the crop, stage by stage

Crop stage	What you see
Vegetative (before flowering)	Drooping, wilting shoot tips with a small entry hole plugged with frass just below; the tip dries.
Flowering	Bored flower buds and petioles; flower drop.
Fruiting	Small, often frass-plugged holes in fruit; tunnels and rotting flesh inside; exit holes left by mature larvae; deformed fruit.

Life cycle of eggplant fruit and shoot borer

Life cycle of Eggplant fruit and shoot borer (brinjal borer) — diagram drawn by Laisha from the stages below. Durations depend on temperature.

Each female lays roughly 100-250 eggs. Newly hatched larvae bore into a shoot or fruit within hours. Mature larvae leave the fruit or shoot and pupate in a tough, boat-shaped cocoon on the plant, in debris or on the soil surface. A generation takes about 3-5 weeks in warm weather.

Stage	Duration	Notes
Egg	About 3-5 days at 25-30 °C	Laid singly.
Larva (5 instars)	About 12-15 days at 25-30 °C	Inside shoots or fruit.
Pupa in cocoon	About 6-10 days	On plant or soil surface.
Adult moth	About 3-7 days	Nocturnal; strongly attracted to its sex pheromone.

Temperature

Development is fastest at about 25-30 °C; it slows sharply in cool winters, when generations lengthen to two months or more.

Generations

About 5-10 overlapping generations a year where eggplant is grown continuously.

Conditions that favour it

Warm, humid weather; continuous and staggered eggplant cropping; leaving infested shoots, fruit and crop residues in or near fields; and calendar spraying, which kills natural enemies without reaching hidden larvae.

Economic threshold level (ETL)

There is no widely validated numeric economic threshold; because larvae are hidden and fruit damage is directly marketable loss, management is preventive from transplanting. Some national programmes publish local action levels based on the percentage of damaged shoots or fruit; use those where they exist.

Thresholds are local. They depend on crop price, control cost, variety and natural-enemy activity, so use the figure your local extension service publishes where one exists.

Damage and yield loss from eggplant fruit and shoot borer

Fruit damage of 30-70% is common in unprotected crops in South Asia, and higher in the hot, humid season; shoot damage reduces plant growth and yield. Farmers in some areas spray more than 50 times a season, which raises residues and costs.

Monitoring

Pheromone traps (about 1 per 100 m², or as advised locally) catch males and show population levels; traps also reduce numbers when used at high density.
Inspect plants twice a week for wilted shoot tips and bored fruit.

How to control eggplant fruit and shoot borer (integrated management)

Control works best as a sequence: prevent, monitor, then act only when a threshold or a risk forecast says so, using the least disruptive option that works.

Cultural control

Clip and destroy wilted shoots weekly from transplanting, and remove damaged fruit at every picking; destroy them away from the field.
Remove and destroy crop residues at the end of the season, and avoid planting next to old eggplant fields.
Raise seedlings under net and inspect before transplanting.

Mechanical and physical control

Fine nylon net barriers around fields or net houses reduce moth entry in some programmes.
Pheromone mass trapping at high density (developed by WorldVeg and national partners) lowers damage substantially.

Biological control

Larval parasitoids (Trathala flavoorbitalis and others) and predators attack the pest; avoiding unnecessary sprays allows them to build up.
Bacillus thuringiensis gives some control of young larvae before they bore in.

Host resistance

Transgenic Bt eggplant expressing the Cry1Ac protein has been grown commercially in Bangladesh since 2014 and in the Philippines more recently, sharply reducing damage and sprays where approved; refuge planting is advised.
Conventional varieties differ in susceptibility; none are resistant.

Chemical control of eggplant fruit and shoot borer — by mode-of-action group only

Laisha names chemical options only by their resistance-committee mode-of-action group (IRAC for insects, mites and nematodes, FRAC for fungi, oomycetes and bacteria, HRAC for weeds), never by active ingredient or product. What is registered differs by country and changes over time; the label and your local plant-protection authority decide what may be used, on which crop, at what rate and with what pre-harvest interval.

Sprays reach only eggs, newly hatched larvae and adults; frequent calendar spraying is ineffective and leaves residues. Respect pre-harvest intervals carefully because fruit is picked every few days. What is registered differs by country and changes over time; follow the label and your local plant-protection authority.

Scheme	Group	Mode of action	Notes
IRAC	28	Ryanodine receptor modulators (diamides)	Used in some programmes.
IRAC	5	Nicotinic acetylcholine receptor allosteric modulators, site I (spinosyns)	Used in some programmes.
IRAC	6	Glutamate-gated chloride channel allosteric modulators (avermectins)	Used in some programmes.
IRAC	11A	Bacillus thuringiensis	Biological; young larvae.

Resistance management

Resistance to IRAC Groups 1 and 3A, and reduced susceptibility to newer groups, has been reported from heavily sprayed areas of South Asia.
Replace calendar spraying with shoot clipping, traps and targeted, rotated applications.

Look-alikes and how to tell them apart

Cotton bollworm — Larger, green-to-brown larvae that bore large holes in fruit and are partly outside the fruit.
Tomato leaf miner (Tuta absoluta) — Blotch mines in leaves and small larvae with a dark band behind the head; rarely bores shoots of eggplant.
Bacterial wilt — The whole plant wilts while green, with brown vascular tissue; no entry hole or frass in shoots.

Host range

Mainly eggplant; occasionally potato, tomato, turkey berry (Solanum torvum), black nightshade and other Solanum species.

What is still uncertain

The species identity of African populations is still being clarified.
Long-term durability of Bt eggplant depends on refuge compliance and is being monitored.

Grow guides for its host crops

How to grow the crop well is the first line of defence. Laisha's free grow guides cover each crop from sowing to harvest:

How to grow Eggplant How to grow Potato How to grow Tomato

Not sure this is what you are seeing?Ask Laisha: describe the symptoms or send a photo, and get a reasoned first read with what to check next — for your crop, your stage and your region.Ask Laisha

Sources

Leucinodes orbonalis (eggplant fruit borer) datasheet — CABI Compendium. https://doi.org/10.1079/cabicompendium.30498
Leucinodes orbonalis (LEUIOR) — EPPO Global Database. https://gd.eppo.int/taxon/LEUIOR
Eggplant fruit and shoot borer IPM — World Vegetable Center. https://avrdc.org/
Discovery of an unknown diversity of Leucinodes species damaging Solanaceae fruits in sub-Saharan Africa (Mally et al. 2015) — ZooKeys. https://doi.org/10.3897/zookeys.472.8781

Written by Laisha from the sources above, in its own words. This page is general reference, not a prescription: confirm identification locally and follow the label and your plant-protection authority.