Submitted to: Methyl Bromide Alternatives and Emissions Research Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 11/1/1999
Publication Date: N/A
Technical Abstract: When orchards and vinyards are replanted, they often don't grow well because the pathogen populations have built up in the soil with the previous crop. Methyl Bromide is an effective pre-plant soil fumigant for perennial crop production that usually eliminates most replant problems. However, as an ozone depleter, MeBr will no longer be available after 2000. Alternative methods to protect perennial crops from the replant problem are being sought. Eighteen alternatives were tested on a peach orchard in Central Valley, California. The alternatives included alternative fumigants (1,3-D, metham sodium, and chloropicrin), alternative application methods, systemic herbicides used to quickly kill the root systems of the previous crop, hot water treatments of the soil, nematode resistant rootstocks, soil inversion, import of non- replant soil, and combinations of these treatments. Shank and drip applied chloropicrin provided the best tree growth. Drip irrigation applied 1,3-D plus metham sodium effectively reduced nematode populations. Other results were mixed. Efficacious and economical alternatives for methyl bromide will allow producers to continue viable production of tree and vine fruits.