I tried to look it up, found on E bay for astronomical price. Where would anyone buy it? Did check old Hallson forum post, seemed to be controversial at that time.

Thanks for the topic, Gary. I didn't know they had a season.

p.s. I was just reading one article says nematodes live in soil, another said they live in leaves. And hot bath kills them. What if you took off infected leaves, put in container and poured boiling water in adding a little at a time for more than 20 minutes? Wouldn't that kill them? Or burn infected leaves in fire pit? Seems better than throwing in trash. Could they live in the trash/garbage dump site?

Going to scrutinize my plants this week.

I know a few people who have been using it, and they claim it reduces the infestation, but doesn't eradicate them. I haven't used it in my garden, but I still noticed a significant decline in my nematode populations this year...weather and/or environmental conditions???

Zerotol was the treatment that many were using which is basically just concentrated hydrogen peroxide. Chris from Hallsons let me know that it ends up being the same concentration when ran through a hose end sprayer as straight from the bottle you can buy off the self in any grocery store. This past Spring I had some known potted hostas with nematodes and these I treated by drenching the soil with bottled hydrogen peroxide and had 100% success in the small to medium size pots and probably 90 to 95% in the larger pots. I treated when they first broke dormancy, before they leafed out. In the garden, I feel it greatly reduced the infestation but didn't eradicate them. Hydrogen peroxide does not kill nematodes in the leaf while NemaKill seems to claim that it does. That is what I'm interested in learning. I'm more interested in the treatment of Garden grown plants, than potted ones as I feel potted ones can be controlled with plain old hydrogen peroxide.

Pandora - Once a hosta leafs out, the nematodes travel from .the soil around the crowns up the stems, them enter the leaves through the stomata on the underside of the leaf. They also will travel from leaf to leaf in the film of water during a rain storm or overhead watering. They remain there until the Fall then travel back to the soil around the crown to over-winter there and then start the cycle all over again. Removing infected leaves does reduce the population, but you can't get them all. Nematodes normally don't harm a plant unless severely infected and is more a cosmetic problem.

This was in current newsletter of American Hosta Society. A different brand name, but ingrediants similar to lindalana's post.

"The chemicals in NEMA STOP are oils of clove, cinnamon and thyme. Accordingly, NEMA STOP is considered to be organic. PureGro™ is the marketing company. In the Spring 2018 issue of The Hosta Journal, PureGro had a full-page advertisement for NEMA STOP. And at the 2018 convention PureGro representatives vended NEMA STOP. NEMA STOP is a contact nematicide. It kills foliar nematodes by direct contact. As such, it is not taken up into the plant tissue and therefore does not kill FN in the plant tissue. In addition, PureGro now claims NEMA STOP also has translaminar activity. The nematicide is redistributed from the upper, sprayed leaf surface to the lower, unsprayed surface. Furthermore, apparently NEMA STOP can move into the plant tissue for a short distance and kill FN in that region. Another recent claim by PureGro is NEMA STOP also acts through “inhalaction activity.” (I assume “inhalation activity” is meant. Concentrated clove oil is a very powerful chemical; you don’t want to take deep sniffs of it.)"

------ credit AHS Newsletter Sept 2018

My hostas don't seem to show any signs, but I put this on speed dial on tablet, just in case.

NemaStop is just a new brand name for NemaKill. Same product, new marketing. The PureGro sales company is new, too, as a consumer-focused offshoot of ExcelAg. Oddly, the NemaKill page at ExcelAg.com is still active.