Japanese beetle (Popillia japonica) is a destructive insect confined mainly to the eastern part of the USA. It thrives on plants and flowers, especially roses, leaving so-called ‘skeletons’ of the herbs. To rescue your precious garden from these pests, you need to start fighting with lawn grubs. Once you know the bug’s life cycle, you can effectively control both the adults and grubs. You can try to do this with chemical insecticides, yet many farmers would recommend organic means which are all natural, safe and ecologically friendly.
In order to start your eradication plan, confirm that you do have japanese beetle grubs in lawn. When white grubs feed on plants roots, the grass gradually thins, gets yellowish and then dies. This makes the grass soft and spongy. In some time irregular brownish patches of grass appear which may increase in size over time. To make sure that there are grubs in your garden you may use shovel to dig down to a depth of three inches into the soil. You will see C-shaped fat worms of whitish color. Do this test in May. In case you do detect larvae, think of the most wise way to eradicate them.
Removing Lawn Grubs
In order to apply your control method effectively do some calculation to predict when the new larvae will emerge. This is the time when grubs are the most vulnerable to any control methods. To do this, collect as many adult individuals as possible (once or twice a week in late June) and write down the obtained number. If the figures drop for seven days in a row, you may assume that the egg-laying period has passed. Most eggs hatch within 12-21 days, thus it is smart to wait three to four weeks before starting fighting them. This way you will be able to target as many young grubs as possible.
When you know the optimal time to start the combat, you may consider several means to fight the pests. There exist effective organic ways to treat your garden as well as chemical ones. Farmers all over the world tend to switch to all natural methods since these are safe and ecologically friendly.
Organic ways to treat the problem imply:
- Employing parasitic nematodes. These are microscopic worms which infest and destroy grubs.
- Use of bacterial milky disease which is scientifically known as Bacillus popilliae Dutky.
- Handpicking adult Japanese beetles when they are inactive. Drop insects into the bucket of warm soapy water to drown.
There are many things to consider and take into account when starting fighting with grubs and beetles. Below are the most essential tips and warnings you need to get acquainted with before applying any control means:
- Don’t water the lawn (if possible) during the peak beetle activity. Females prefer to lay eggs in moist soil.
- In order to save valuable ornamentals form adult Japanese beetles consider buying commercial plant nets.
You can find further details of Japanese Beetles Control here.