However, in 10 years, there should be sufficient leaf mulch to preclude the brown garden snail problem. Alternatively a slurry containing tribasic copper sulfate can be sprayed on trunks to act as a barrier. Geese and ducks have been used in some groves successfully, as long as coyotes are controlled. Frequent microsprinkler irrigations encourage brown garden snail populations. It is best to extend the interval between irrigations as much as possible if snails are a problem.
Skirt pruning to reduce the avenues for canopy entry can also reduce damage.
Trim back any branches touching the orchard floor. If cultural practices are not keeping snails at subeconomic levels, it may be necessary to apply metaldehyde bait to reduce populations, especially during wet springs. Use the higher rate for heavy infestations. Overlap the copper foil on the tree trunk about 8 inches so it will slip and allow for trunk growth. The Regents of the University of California.