Plantwise Factsheets for Farmers
Management of Whitefly
Recognize the problem
Whitefly adults are tiny (about 1 mm long)
moth-like insects. They are white to slightly yellowish in colour and their
bodies and both pairs of wings are covered with a powdery and waxy secretion.
They suck cell sap from the lower surface of the leaves. The symptoms of
whitefly infestation are yellowing of leaves, withered plant parts and reduced
flowering and fruiting. Sticky substances appear on the leaf surface and sooty
mold develops on leaves and fruits, giving the plant a sickly black appearance.
In severe infestation, plants start wilting and if the plant is shaken, a cloud
of tiny moth-like insects flies out but rapidly resettles.
Whitefly is a common insect pest in Nepal.
It is polyphagous, meaning it has a wide host range. It is a serious insect
pest of many vegetables particularly tomatoes, eggplants and cucumber. Both nymphs and adults causes damage on crops. Whiteflies also transmit
the viruses that cause yellow mosaic and leaf curl disease. They affect the
seedling, vegetative growth and flowering stages of the plant.
Avoid excessive damp and dark crop
growing environments in glasshouses
- Do not transplant whitefly infested
- Intercrop with non-preferred crops such as
wheat and barley into the main crop to reduce whitefly infestation
- Avoid the application of excessive
nitrogenous fertilizer as succulent and tender plants are vulnerable to whitefly
- Rogue out the virus affected plants
as soon as symptoms are observed
- Install yellow sticky traps for
monitoring and mass trapping of adult whiteflies
- Spray neem-based insecticides such as
Altineem @ 3-5 ml/litre water to manage early instars of whitefly
- If further sprays are needed, spray
imidacloprid 200 SL @ 1.5 ml per 8 litres water at 15 day intervals
- If the infestation is severe, apply deltamethrin 2.8EC @ 1
ml/litre at 7 day intervals
When using a pesticide, always wear protective clothing and follow the instructions on the product label, such as dosage, timing of application, and pre-harvest interval.
The recommendations in this factsheet are relevant to:
Pakistan, Bangladesh, Sri Lanka, India, Nepal
Plantwise Factsheets Library app
Get all of the factsheets and pest management decision guides from this website in an offline format via the Plantwise Factsheets Library app.