The key here is not to confuse "least toxic" with the source of the product. Think back to the begining of the 20th century. The most commonly used pesticide/fungicide was lead. Although organic, certinly not the least toxic.
Also, I think a second qualifier would have to be that "it works in small amounts". So I am going to give the anser to the question as stated like this: What is the least toxic prodoct, that works, that will kill grub worms?
I think that it is also important to note that my answer is based on LD50 ratings. LD50 stands for: Lethal dose that it will take to kill 50% of the test subjects, in millograms of product, for kilograms of test subject. This is a standard, provided by th US government, and is the industry standard for pest control companies when determining toxoicity to humans.
Look for the acive ingrediant "imidacloprid"
Imidacloprid (IUPAC name (EZ)-1-(6-chloro-3-pyridylmethyl)-N-nitroimidazolidin-2-ylideneamine) is an insecticide origanally manufactured by Bayer Cropscience (part of the drug and chemical conglomerate Bayer AG). It is sold under a variety of trade names as it is now a post patent product. Some of the names include; Admire, Advantage, Merit, Confidor, Hachikusan, Premise, Prothor, and Winner. Merit, being the most widly known.
Specifically, it causes a blockage in a type of neuronal pathway (nicotinergic) that is more abundant in insects than in warmblooded animals (making the chemical selectively more toxic to insects than warmblooded animals). This blockage leads to the accumulation of acetylcholine, an important neurotransmitter, resulting in the insect's paralysis, and eventually death. It is effective on contact and via stomach action.
There is no known poisening of a human by imidacloprid.
Imidacloprid was first patented in the United States in U.S. Pat. No. 4,742,060, on May 3, 1988, by Nihon Tokushu Noyaku Seizo K.K. of Tokyo, Japan.
A systemic insecticide
Imidacloprid is taken up by plant roots and diffuses in the plant vascular system, where insects ingest it by sucking the plant fluids. The products Confidor and Admire are meant for application via irrigation, application to the soil, or on foliage. Merit is applied via a granular or liquid application and is labled primarily for grub worms.
Because of this pesticides slow movement in the plant, one application often gives season long control.
To effectively get rid of grub worms in potted plants, you can use beneficial nematodes or insecticidal soap. Beneficial nematodes are microscopic organisms that can kill grub worms without harming the plants. Insecticidal soap can also be effective in controlling grub worms. Apply these treatments according to the instructions on the product packaging for best results.
Spray-N-Grow makes a natural garden pesticide for killing grub worms. It is called "Grub Beater". It is safe and its contents are derived from the neem tree. It will eliminate your grub worms without harming beneficial bugs. Their website is http://www.spray-n-growgardening.com
all grub worms are safe to eat in the desert some people eat grub worms like you would eat a bag of crisps.
6 legs on a grub
yes
no
that's what I've heard, the grub is actually the larva stage of the June bug and not a worm
I have absolutely no clue.
Yes, they do such as wasps.
Some animals that eat grub worms are raccoons, birds, skunks, and moles. Humans have also been known to eat grubs.
The largest grub worm recorded was found in Australia and measured around 5 inches in length. Grub worms can vary in size depending on the species and environmental conditions.
Grub