HomePest managementKeys for Identifying Vegetable DiseasesTomato Diagnostic KeySymptoms on LeavesPesticide Damage

Pesticide Damage

Insecticide injury:
  • Malathion
damaged tomato leaf
Photo courtesy of Cornell University.

Symptoms: classical pesticide burn on upper and lower leaf surfaces. Absent any fungal growth unless secondary pathogens have invaded.

Virus-like symptoms caused by herbicides:
  • 2,4-D (Phenoxy)
damaged and distorted tomato plant
Photo courtesy of T.A. Zitter, Cornell University, NY.

Symptoms: extent of damage depends on dosage applied. Growth distortion, epinasty, and fernleaf-like symptoms.

  • Glyphosate 
damaged tomato plant
Photo courtesy of J. Arboleya, INIA, Las Brujas, Uruguay.

Symptoms: extent of damage depends on dosage applied. Terminal epinasty with fernleaf distortion, yellowing and necrosis, stunting, or bright yellow coloration.

 

More information/prepared by:

  • For more information, please contact:
    Meg McGrath – mtm3@cornell.edu & Chris Smart – cds14@cornell.edu
  • Originally prepared for Vegetable MD Online by Thomas A. Zitter.