What's happening
Brush a hibiscus, tomato, or ornamental plant on a sunny balcony and a small white cloud rises—that is adult whitefly. They suck sap from leaf undersides, leaving sticky honeydew and pale, weak growth. In warm Indian weather they reproduce fast; one ignored pot can seed neighbours on the same railing within weeks.
Seedlings and young vegetable pots on terraces in Bangalore, Pune, and Hyderabad see outbreaks from February onward; coastal humid cities can carry populations through mild winters on perennial shrubs.
Why this happens
Whiteflies favour soft, fast-growing tissue. Over-fertilised nitrogen-heavy feeding produces exactly that. Crowded pots reduce airflow. Monsoon humidity does not kill them; sheltered balconies keep populations cycling. Ants farming honeydew can protect colonies—watch ant trails up stems. Buying infested nursery plants without inspecting undersides is a common entry route.
What usually helps
Inspect new plants before placing on the balcony. At first sign, isolate the pot if possible. Spray leaf undersides with diluted mild soap (one teaspoon per litre) or neem oil (5 ml per litre) at sunset; repeat every five to seven days for three cycles. Yellow sticky cards near the canopy catch adults. Remove heavily infested lower leaves into a sealed bag. Reduce nitrogen feed until control holds. For edible greens, rinse leaves thoroughly before cooking and respect neem withholding if you use oil. Strong chemical sprays on windy balconies risk neighbours and beneficial insects—start cultural and soap routes.
What to expect next
Populations drop slowly; expect three to four weeks of consistent treatment. New leaves should emerge clean and hold colour. Sticky residue may need a plain water wipe. If stems are already stunted, flowering may delay a cycle—focus on clean new growth rather than saving every old leaf.