Leaf Curl Virus — Identification, Prevention & Vector Management
Leaf curl viruses (CLCuV in cotton, TYLCV in tomato) are spread by whitefly and have no direct cure. The only protection is early and consistent whitefly control, combined with removal of infected plants to stop spread.
How to identify leaf curl virus
Watch for these signs in your field.
Upward or downward leaf curling
Leaves curl upward (cotton) or downward (tomato/chili). New growth appears twisted and distorted.
Yellowing (chlorosis) and stunting
Infected plants show yellowing of young leaves, stunted growth, and shortened internodes. Plants infected early rarely recover productivity.
Enations (leaf outgrowths)
In cotton, thickened vein enations (small leaf-like outgrowths) on the underside of leaves are a diagnostic sign of Cotton Leaf Curl Virus.
How to control leaf curl virus
Follow this step-by-step protocol for best results.
Control whitefly vector — prevention is the only option
Spray Imidacloprid 17.8% SL (0.3 ml/L) or Thiamethoxam 25% WG (0.3 g/L) at 10–12 day intervals from early crop stage. There is no cure for the virus once infected.
Remove infected plants immediately
Uproot and destroy infected plants as soon as symptoms appear. Do not leave wilting, curling plants in the field — they act as virus reservoirs for whitefly to pick up and spread to healthy plants.
Use reflective mulch and sticky traps
Silver reflective mulch repels whitefly from landing. Yellow sticky traps (10 per acre) monitor and trap whitefly. Both are especially useful for early-stage crops and nurseries.
Which crops are at risk?
Tap a crop for the full pest management guide.
Leaf Curl Virus — Common Questions
Is there any cure for Cotton Leaf Curl Virus (CLCuV)?
No — there is no direct cure for Cotton Leaf Curl Virus or any plant virus. Once infected, the plant cannot recover fully. The only management is: (1) control whitefly vector aggressively with systemic insecticides, (2) uproot and destroy infected plants, (3) use CLCuV-tolerant cotton varieties in endemic areas.
How does Leaf Curl Virus spread in the field?
Leaf curl viruses spread through whitefly (Bemisia tabaci). A single whitefly can acquire the virus in just 30 minutes of feeding on an infected plant, and transmit it within 20–30 minutes on a healthy plant. This is why whitefly control needs to start before virus appears in the field.
Which cotton varieties are resistant to CLCuV?
Several Bt cotton hybrids have CLCuV tolerance — look for varieties described as 'CLCuV tolerant' from companies like Mahyco, Nuziveedu, Kaveri. However, no variety is fully immune. Whitefly management remains essential even with tolerant varieties.
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