These active ingredients can be toxic to bees if the bees visit flowers that were recently sprayed. Mowing prior to making the application will avoid this problem by removing the flowers. Weeds that flower again after mowing are much safer than weed flowers that were sprayed directly with insecticide, but some of the insecticide is absorbed by the roots and will move into the pollen and nectar.
More research is needed on this, but it could cause problems for native bees or have long-term health effects on honey bees or bumble bees.
If there is nothing flowering in the lawn, there is nothing in it that would attract bees. In addition, grub control products that contain the active ingredient chlorantraniliprole are safe for bees , even when weed flowers are sprayed. Finally, avoid spray drift or granular spreader drift to flower beds when applying thiamethoxam, imidacloprid, clothianidin or any insecticide for grubs other than chlorantraniliprole.
There are two chemicals, carbaryl and trichlorfon, that are considered curative treatments. They are short-lived compounds that kill all life stages of grubs.
These two insecticides are the only options if high numbers of grubs are found in the fall and in spring before early May. They are not as effective as the preventive compounds in reducing grub numbers. Consider carefully whether it would be best to wait and apply a preventive later.
If the need should arise to use a curative compound, make sure to keep the infested lawn watered and fertilized and treat the area again with a preventive application the next summer or the problem will likely reoccur in the fall or the following spring.
Current research also shows that watering with 0. Our research has indicated that carbaryl has been a little more effective on European chafer grubs than trichlorfon. Both compounds work equally well on Japanese beetle grubs. It will take days for the grubs to begin dying after the insecticide is applied. However, even trichlorfon should not be evaluated for at least five days after application assuming it rains or irrigation was applied , and carbaryl may need three to four weeks to be effective.
Do not apply any curative compounds in the spring after May 15 as grubs stop feeding in late May as they prepare to pupate. As with the preventive products, lawns should be mowed immediately before applying carbaryl or trichlorfon to protect bees. Do not use products containing ONLY lambda-cyhalothrin, gamma-cyhalothrin, bifenthrin, deltamethrin, cyfluthrin or permethrin for grub control. Products containing only these ingredients will not work for grub control because the active ingredient binds with organic material and will not move down to where the grubs are feeding.
These products work well for above-ground feeding insects that live on the grass leaves or soil surface, but not for insects that feed on the roots. At one garden center a clerk showed us two products, one containing only permethrin and one containing only bifenthrin, when we asked for products to control grubs.
Neither of the products listed grubs on the label printed on the bag and neither of the products would have controlled grubs. There is a widely sold trade name called Triazicide from Spectrum that lists grubs on the label and states it will control insects above or below ground and has a picture of a grub on the front of the bag. It contains only lambda-cyhalothrin or gamma-cyhalothrin. Triazicide will not control grubs. Carefully check the label for ingredients.
There was a product available in years past from Spectrum that contained imidacloprid, but I did not see any in my visits the last two years and Make a regular practice of mowing your yard with the mower on the highest setting 3. A half-inch of irrigation is when lawn sprinklers are run until a container like a coffee mug, or several mugs, fills to a level 0.
Below is a short list of products now being sold for grub control as of May 22, , in stores checked in the Mid-Michigan area. An online search indicates there are other products that will be available at other stores. Check the active ingredients. This article was published by Michigan State University Extension. How to choose and when to apply grub control products for your lawn. Grubs found in turfgrass.
Finally, avoid spray drift or granular spreader drift to flower beds when applying thiamethoxam, imidacloprid, clothianidin or any insecticide for grubs other than chlorantraniliprole 2 CURATIVE insecticides There are two chemicals, carbaryl and trichlorfon, that are considered curative treatments. After all, grubs are one of those pests pictured on bags of insecticide at the local Home Depot, so they must be bad—right? Well yes, sort of. The real question is whether we need to treat our gardens and lawns now to kill lawn-eating grubs?
The answer is no. White grubs present in lawns and many of those in garden beds are almost always one of two species of scarab beetle known as the June beetle and the masked chafer. Both species can be damaging to turf in late summer, though feeding during the winter and spring is insignificant. The grubs we turn over in the spring garden are essentially in hibernation.
They remain in a non-feeding state until May, when they undergo pupation before emerging from the ground as an adult in June and July. As alarming as these juicy springtime grubs appear, they do little harm to plants in the spring.
These late-summer white grubs are the pests in that they feed on the roots of our common turf grasses. And even if your treatment did kill grubs present now, they would be replaced in June when adult June beetles fly in from surrounding lawns and landscapes. An April-emerging scarab beetle common right now in parts of Dallas is of no concern to lawns or gardens.
It had a habit of rolling balls of dung and deposited the balls in their burrows, on to which they would lay their eggs.
When the eggs hatched, the larvae would feed on the ball of dung. After the ball was consumed, the young adults would emerge from the burrow, looking for more food or a mate. This emergence was seen as a type of creation and it was associated with one of their gods. In North America, there are at least 10 species of white grubs, 6 of which are native to the area.
The accidentally introduced species are the European chafer, oriental beetle, Asiatic garden beetle and the Japanese beetle. The Japanese beetle has become a severe pest mainly east of the Mississippi River, although their range seems to increase in size every year.
Most grubs have a one year life cycle, but there are ones that have a two or three-year life cycle. Their life cycle is known as metamorphosis. Begin life as an egg, laid into the soil 1 to 4 inches deep in a dehydrated state 2.
Eggs absorb water from the surrounding soil to remain viable 3. After 2 to 3 weeks, eggs hatch into tiny grubs, about the size of a bluegrass seed 4. Start feeding on fine root hairs and other organic matter 5. Resurface in early spring, do a little bit of light feeding and then dig back into the soil to pupate 7.
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