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Title:   Author  item
                                            FENNIMORE, STEVE - UNIV OF CALIF, DAVISitem
                                            DUNIWAY, JOHN - UNIV OF CALIF, DAVISitem
                                            Browne, Gregitem
                                            Martin, Frankitem
                                            AJWA, HUSEIN - UNIV OF CALIF, DAVISitem
                                            WESTERDAHL, BECKY - UNIV OF CALIF, DAVISitem
                                            GOODHUE, RACHEL - UNIV OF CALIF, DAVISitem
                                            HAAR, MILTON - UNIV OF MINNESOTAitem
                                            WINTERBOTTOM, CHRISTOPHER - SIERRA CASCADE NURSERY
  Submitted to: California Agriculture
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 4/1/2008
                                    Publication  Date: 6/1/2008
                                    Citation: Fennimore, S.A., Duniway, J.M., Browne, G.T., Martin, F.N., Ajwa, H.A., Westerdahl, B.B., Goodhue, R.E., Haar, M., Winterbottom, C.Q. 2008. Methyl bromide alternatives for california strawberry nurseries. California Agriculture. April-June 2008:62-67Interpretive Summary: The effects of methyl bromide (MB) alternative fumigants on soil pests, plant productivity in nursery and fruiting fields, as well as production costs, were evaluated in California strawberry nurseries by an interdisciplinary team.  Our trials followed nursery stock through low and high elevation phases of propagation at nurseries and a complete cycle of fruit production in coastal fields; at each step the soils were treated with alternatives to MB.  The locations included  a low elevation nursery at Ballico, CA a high elevation nursery at Macdoel, CA., and fruiting fields near Oxnard and Watsonville, CA.  Chemicals tested were iodomethane plus chloropicrin, 1,3-dichloropropene plus chloropicrin followed by dazomet, and chloropicrin followed by dazomet, compared to the standard MB plus chloropicrin.  Plant yields from the nurseries and fruit yields from Oxnard and Watsonville indicate that plots treated with iodomethane plus chloropicrin, 1,3-dichloropropene followed by dazomet and chloropicrin followed by dazomet, produced runner plant yields that were similar to MB plus chloropicrin.  Economic analysis, however suggests that nursery profitability may suffer from the loss of MB.  Even if yields and weeding times are similar, differences in treatment costs will affect profitability. If strawberry nurseries in other countries are able to continue MB plus chloropicrin use while U.S. strawberry nurseries must move to alternative treatments, then U.S. producers may become less internationally competitive.  Since roughly 40% of California’s strawberry runner plant production is sold outside of California (CSC 1999), this could significantly affect producers.
                                Technical Abstract: The effects of methyl bromide (MB) alternative fumigants on soil pests, plant productivity in nursery and fruiting fields, as well as production costs, were evaluated in California strawberry nurseries by an interdisciplinary team.  Our trials followed nursery stock through low and high elevation phases of propagation at nurseries and a complete cycle of fruit production in coastal fields; at each step the soils were treated with alternatives to MB.  The locations included  a low elevation nursery at Ballico, CA a high elevation nursery at Macdoel, CA., and fruiting fields near Oxnard and Watsonville, CA.  Chemicals tested were iodomethane plus chloropicrin, 1,3-dichloropropene plus chloropicrin followed by dazomet, and chloropicrin followed by dazomet, compared to the standard MB plus chloropicrin.  Plant yields from the nurseries and fruit yields from Oxnard and Watsonville indicate that plots treated with iodomethane plus chloropicrin, 1,3-dichloropropene followed by dazomet and chloropicrin followed by dazomet, produced runner plant yields that were similar to MB plus chloropicrin.  Economic analysis, however suggests that nursery profitability may suffer from the loss of MB.  Even if yields and weeding times are similar, differences in treatment costs will affect profitability. If strawberry nurseries in other countries are able to continue MB plus chloropicrin use while U.S. strawberry nurseries must move to alternative treatments, then U.S. producers may become less internationally competitive.  Since roughly 40% of California’s strawberry runner plant production is sold outside of California (CSC 1999), this could significantly affect producers.


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