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.
Thorough coverage of the crop is essential for effective leafminer control. Time insecticides to have the most impact on susceptible stages. Based upon what is known already, sprays applied early in the morning should be most effective. Spraying should only be based upon regular and consistent scouting information. Generally, Diglyphus works better in the summer, whereas Dacnusa works better in the winter.