PESTICIDE USE IN GREENHOUSES AND HIGH TUNNELS: Pesticides can be used on high tunnel and greenhouse crops if 1) the crop and pest/disease is on the label, AND the products specifically says it can be used in the greenhouse OR 2) the crop and pest/disease is on the label, AND the product is `silent' about use in the greenhouse in the greenhouse. Products that specifically prohibit greenhouse use cannot be used in greenhouses or high tunnels regardless of the crops or pests/diseases listed on the label.
The different crops that make up salad mix and microgreens may or may not be susceptible to the same group of diseases. For additional disease control information, refer to the section of this guide relating to the specific plant family.
Since salad mix is harvested prior to maturity, diseases that affect mature crops often do not pose problems. However, high planting densities and use of row covers may increase the likelihood of other problems. For example, fungal diseases that usually don't infect young plants (e.g., downy mildew and Rhizoctonia in lettuce) often become a problem in salad mix production. The primary disease issue in microgreens production is damping-off, caused by Pythium and other soilborne fungi. Proper sanitation of greenhouse supplies and tools used is imperative for control.
Chemical control options are limited because of the very short pre-harvest interval and the diversity of plant families that may be included in the mix. When treating salad mix, make sure that chemicals are labeled for all of the crop species in the mix.