The tomato leaf miner moth is becoming increasingly challenging for tomato farmers to combat. However, CropLife SA says that although some pesticide applications have been ineffective, the pest has not yet shown resistance to any active ingredients. - Advertisement -In a webinar hosted by CropLife SA in September, farmers were cautioned to implement good stewardship practices to prevent tomato leaf miner (Tuta absoluta) from developing resistance against pesticides. This was because of overapplication of the same active ingredients, as well as improper applications. Rotate active ingredients, don’t return to the specific ingredient before 60 days, and follow the dosage instructions.