In field vegetables, there is little information about leafminer tolerance. Degrees of infestation vary with the type of crop, neighbouring crops, weeds, temperatures and leafminer species. Alternating leafminer susceptible crops with leafminer resistant crops reduces the population. Leaving greenhouses empty during the winter also reduces leafminer populations, however this is not always practical or economical. Crop rotation in field vegetables is always recommended for this and many other pests.
Many wild plants act as hosts for leafminers.
Maintaining weed free conditions both in the greenhouse and the field is recommended. Pest Control Products Few pesticides are labeled for control of leafminers in Canada. Leafminers are known to develop resistance to insecticides quite quickly. When available, always rotate between insecticide groups. Most effective control is obtained with systemic or translaminar products which target the larvae.