In northern climates your target pest may be present as larvae in the soil in fall or spring months. In addition, when you know your pest is present, several applications of nematodes will be more effective than one. Again, if unsure when to apply for what insect, check our FactSheets , nematode suppliers, or Ask the Experts . Proper storage and handling is essential to nematode health. Always follow the package instructions for the best method of mixing nematodes.
Formulations vary depending on the species and target insect.
They can include gels, dry granules, clay, vermiculite, and water-filled sponges. No matter which formulation you buy, nematodes should be used as soon as possible after receiving them from the supplier because the length of time they were stored prior to shipment is usually unknown. Also, nematodes shouldn't be stored in hot vehicles, or left in spray tanks for long periods of time. Watering the insect-infested area before and after applying nematodes keeps the soil moist and helps move them deeper into the soil. Care should be taken not to soak the area because nematodes in too much water cannot infect.