The beetle species Popillia Japonica is commonly known as the Japanese beetle. It is about 15 millimetres (0.6 in) long and 10 millimetres (0.4 in) wide, with iridescent copper-colored elytra and green thorax and head. It is not very destructive in Japan, where it is controlled by natural predators, but in America it is a serious pest of about 200 species of plants, including rose bushes, grapes, hops, canna, crape myrtles, and others.
It is a clumsy flier, dropping several centimeters when it hits a wall. Japanese beetle traps therefore consist of a pair of crossed walls with a bag underneath, and are baited with floral scent, pheromone, or both. However, studies done at the University of Kentucky suggest traps attract more beetles than they actually trap, thus causing more damage along the flight path of the beetles and in the vicinity of the trap than may have occurred if the trap were not present. These insects damage plants by skeletonizing the foliage, that is, consuming only the leaf material between the veins.
Japanese beetles are garden pests because of the damage they caused to healthy plants. They destroy the plants by eating on plant tissue, targeting the leaves and flowers of over 300 species of plants. Early detection must be done to be able to control their population in your garden.
Canola oil is believed to be one of the most effective home-based Japanese beetle repellent. It is common in our kitchen and can be used effectively in no time. A mixture of 1 tablespoon of canola oil, a quarter of water and a few drops of liquid soap can effectively be a Japanese beetle repellent. The mixture is sprayed on plants as the oil stick to the Japanese beetles, causing them to be suffocated. The soap dish can only add to their confusion, but only has a small poison-effect.
Another effective Japanese repellent is with the use of some plants that has a repelling effect. This includes catnip, chives, garlic, tansy and rue. But some of these plants are weeds that suck up water and nourishment from the other neighboring plants, so it is advised to spread them around the garden. Spraying on your garden with a combination of the repelling plants, like mixture of small amounts of ground tansy and rue, can keep the Japanese beetles away.
Another Japanese beetle repellent is putting nematodes that eat Japanese beetles on your garden. Nematodes are safe and effective because these are microscopic beneficial worms. This method is a form of natural beetle repellent. This method can also be used as an Asian Beetle Repellent.
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