David, we use duckbills or manta rays exclusively here in the sandy loam soils
of Leelanau County because of high failure rate
With helicals in sand. I like the ductile 11" manta ray for apples and the 6"
inch aluminum or ductile for rocky soil in grapes. Whenever we have a helical
fail in an
Glen, i have been dealing with SWD in peaches now for at least 5 years. We have
the biggest tart cherry industry here in the country so our numbers are very
high. Ive noticed they have no problem getting into the flesh as well.
Kevin J. VerSnyder
VerSnyder Orchards
Lake Leelanau, MI
