Make sure the nematodes are fresh because they are living organisms. Water the ground before you spread them out, and keep the soil moist after you apply. You can also apply nematodes in mulch. For 50 or 100 million nematodes mix, use 1/2 teaspoon per gallon of water. Beneficial nematodes only attack soil dwelling pests, such as Japanese beetles, fleas, German cockroaches, termites, and ants. They are not harmful to people, animals, plants, or earthworms. [4] X Research source You can purchase nematodes online, at garden centers, or at most major home improvement retailers. This method is effective for killing the pest in its larvae stage.
Some ingredients to look for when purchasing an insecticide are carbaryl, acephate, and permethrin. [5] X Research source A Pyrethrin-based insecticide is a safe way to control pests on your plants while getting rid of other beetles in the process. [6] X Research source Some insecticides are aimed at high Japanese beetle activity in your yard. Others are designed to be used in the early fall once the eggs have hatched and grubs are present. Make sure you read the label on the insecticide before you purchase it to find out what specific problem it targets.
Azadirachtin, one of the components of neem oil, can also repel and reduce the feeding of nematodes. [7] X Trustworthy Source National Pesticide Information Center Organization run by Oregon State University providing objective, science-based information about pests and pesticides Go to source Use caution using neem oil if you have nematodes in your ground to combat grubs. You can purchase neem oil insecticides online and at most major retailers with a garden center.
When applying insecticidal soaps, you must thoroughly wet the pest. Most pests needs to be sprayed every 4-7 days. The ingredient you are looking for in a spray is potassium bicarbonate. [8] X Research source Even soaps manufactured specifically for insects can harm certain plants. Check the label of the bottle, or do a test on your plant before spraying wide areas or repeatedly.
Don’t squish the beetle to kill it. Beetles attract more beetles through pheromones, which are so powerful they can attract beetles from a few thousand feet. [9] X Research source If you squish a Japanese beetle, you run the risk of releasing the female beetle sex pheromone. This should be done early in the morning. Lay out a drop cloth and shake your plants, then dump the beetles on the cloth into soapy water.
You can buy floating row covers online or at garden centers.
