Pomegranate Butterfly
Deudorix (Virachola) isocrates
The most serious pest of pomegranate in India and South Asia, a small butterfly whose caterpillars bore into the developing fruit and feed on the pulp and seeds inside. Hidden within the fruit, the larvae hollow and rot it from the inside, and infestations can ruin a large share of the crop.
🔎 How to spot it
The adult is a small butterfly of the gossamer-winged family (Lycaenidae) with a short tail on each hindwing; the male is violet-brown above and the female is duller brown with an orange patch, both about an inch across. Eggs are laid singly on flower buds, the calyx, tender fruit, and stalks. The caterpillar is a short, stout, brown to dirty-white grub that is found inside the fruit; the real field sign is a bored fruit with an entry hole plugged by frass and often rot around it.
🥀 Damage it causes
After hatching, the larva bores into the developing fruit and eats the pulp and seeds, packing the cavity with frass. Bacteria and fungi follow the wound, so the fruit blackens, rots, and frequently drops, and a single caterpillar can destroy a fruit. It also attacks flower buds and young fruit, and reported losses run very high, from roughly 40 to 90 percent where it is uncontrolled.
🛡️ Prevent it
Bagging the developing fruit with paper or cloth sleeves after fruit set is a highly effective barrier that stops the butterfly from laying on the fruit. Keep the orchard clean by collecting and destroying all bored and fallen fruit (and infested buds) to break the life cycle, prune to keep trees open and easy to monitor, and avoid having fruit at all stages year round, which keeps the pest going continuously.
🧯 If it is already here
Because the caterpillar feeds protected inside the fruit, control depends on timing action to the egg and newly hatched stage, before the larva bores in, guided by monitoring from flowering through early fruiting. Removing and destroying infested fruit is essential, and where pressure is high, recommended insecticides applied at flowering and early fruit set, along with the egg parasitoid and other natural enemies, reduce the next generation. Sprays do little once larvae are inside the fruit.
💡 Good to know
A pomegranate with an off-color, frass-plugged hole and rot at the calyx end almost always has a caterpillar inside, so split and destroy such fruit. Fruit bagging plus strict removal of bored and dropped fruit are the backbone of control, since insecticides cannot reach the larva once it has tunneled in.
🌱 Plants it attacks
4 plants in the library can be attacked by this pest
For educational and informational purposes only. Pest control advice is general guidance drawn from university cooperative extension sources; always identify a pest positively and read and follow the label on any product before use, especially around food crops, children, and pets.