How to Best Apply Nematodes to Keep your Lawn and Garden Healthy
More than 200 species of pest insects from 100 insect families are susceptible to these nematodes. Such as: Japanese Beetles, Northern Masked Chafer, European Chafer, Rose Chafer, Fly larvae, Oriental Beetles, June Beetles, Flea beetles, Bill-bugs, Cut-worms, Army worms (Tent Caterpillars), Black Vine Weevils, Strawberry Root Weevils, Fungus Gnats, Sciarid larvae, Sod Web-worms, Girdler, Citrus Weevils, Maggots and other Dip-tera, Mole Crickets, Iris Borer, Root Maggot, Cabbage Root Maggot and Carrot Weevils.
Timing is very important when applying the nematodes. Depending on where you are in the world the exact timing will be different. But there a few guidelines that if followed will ensure you applying at the correct time. Below you will see a figure that shows the typical life cycle of a grub, but you will have to observe your local conditions and use accordingly. The most important factor is temperature and season, you want to apply in spring and early fall while the soil temperature is above 10 degrees Celcius.
Beneficial Nematodes are very easy to use. The first steps are to prepare the soil for the application. Fertilizers should be avoided roughly 2 weeks prior to and after nematode application, because they may be adversely affected by high nitrogen content. When you decide to apply the nematodes wet the areas of your lawn or garden that will have nematodes applied. This will help the nematodes move freely throughout the area. Once the area has been moistened mix the contents of the beneficial nematodes in a bucket of water and stir to break up any lumps, and let the entire solution soak for a few minutes. For best results there are special nematode sprayers that are recommended. However, application can be made using a water-can, irrigation system, knapsack or sprayer. On sprayer use a maximum pressure to avoid blockage, all sieves should be removed. The sprayer nozzle opening should be at least 1/2 mm.
Evenly spread the spraying solutions over the ground area to be treated. Continuous mixing should take place to prevent the nematodes from sinking to the bottom. After application keep the soil moist during the first two weeks for the nematodes to get establish.
Apply nematodes in the early evening or late afternoon when soil temps are lower and UV incidence is lower as well (cloudy or rainy days are good too).