A comment from George Africa who owns a commercial nursery in Vermont, U.S.A. made me face my spotty knowledge. My last post was about moles and related problems. George left a comment about his experiences with them. George can be found Here, and also Here. His nursery website is Here.
Following is part of my reply to George's comment:
Let me explain some of my dilemma, for you see it is true that a little bit of knowledge is a dangerous thing. I am afraid of the power of which I am capable, example: I know how to use "Dunk" (Bacillus thuringiensis subspecies israaelenses called BTI) to kill mosquitoe larvae in a little pool; I know how to use Nematodes (Steinernema carpocapsae and Heterorhabditis bacteriophora, and possibly BT) that will mortally infect iris borer larvae; and, I know how to use bacteria Bacillus popilliae spores on my lawn to infect grubs with Milky-spore disease bacteria. So, what is my problem?
I treasure Dragon Flies: Dragon Flies lay their eggs in the little pool. Will the "Dunk" kill the baby Dragon Flies, (the babies, that, by the way, eat the mosquito wrigglers)?
Will the Nematodes Steinernema carpocapsae and Heterorhabditis bacteriophora stay where I put them close to the iris plants or will they migrate into the lawn?
If I treat the lawn with BT spores to get rid of the grubs (that attract moles), even if, as it is advertised, they do not harm earthworms, what will it do to my beloved Fire Flies that rise from the sod by the hundreds every evening and entertain me from June to late summer with their wondrous ethereal presence?
Does anyone know? Really know?
P.S. Don't tell me to ask the Horticulture or Agriculture Extension Agents. That is the organization which (decades ago) told farmers Multiflora roses would not spread and are not invasive. Partial knowledge?