Udompetaikul, Vasu

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Udompetaikul, Vasu
Alternative Name
Udompetaikul, V.
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Email
vasu.ud@kmitl.ac.th

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    Item type:Publication,
    Managing the almond and stone fruit replant disease complex with less soil fumigant
    (2013-07-01)
    Browne, Greg T.
    ;
    Lampinen, Bruce D.
    ;
    Holtz, Brent A.
    ;
    Doll, David A.
    ;
    Upadhyaya, Shrinivasa K.
    As much as one-third of California's almond and stone fruit acreage is infested with potentially debilitating plant parasitic nematodes, and even more of the land is impacted by Prunus replant disease (PRD), a poorly understood soilborne disease complex that suppresses early growth and cumulative yield in replanted almond and peach orchards. Preplant soil fumigation has controlled these key replant problems, but the traditional fumigant of choice, methyl bromide, has been phased out, and other soil fumigants are increasingly regulated and expensive. We tested fumigant and nonfumigant alternatives to methyl bromide in multiple-year replant trials. Costs and benefits were evaluated for alternative fumigants applied by shanks in conventional strip and full-coverage treatments and applied by shanks or drip in novel spot treatments that targeted tree planting sites. Short-term sudangrass rotation and prudent rootstock selection were examined as nonfumigant approaches to managing PRD. Trial results indicated that integrations of the treatments may acceptably control PRD with relatively little soil fumigant.
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    Item type:Publication,
    Tractor-mounted, GPS-based spot fumigation system manages Prunus replant disease
    (2013-10-01)
    Udompetaikul, V.
    ;
    Coates, Robert W.
    ;
    Upadhyaya, Shrinivasa K.
    ;
    Browne, Greg T.
    ;
    Shafii, Mir
    Our research goal was to use recent advances in global positioning system (GPS) and computer technology to apply just the right amount of fumigant where it is most needed (i.e., in a small target treatment zone in and around each tree replanting site) to control Prunus replant disease (PRD). We developed and confirmed the function of (1) GPS-based software that can be used on cleared orchard land to flexibly plan and map all of an orchard's future tree sites and associated spot fumigation treatment zones and 2) a tractor-based GPS-controlled spot fumigation system to quickly and safely treat the targeted tree site treatment zones. In trials in two almond orchards and one peach orchard, our evaluations of the composite mapping and application system, which examined spatial accuracy of the spot treatments, delivery rate accuracy of the spot treatments, and tree growth responses to the spot treatments, all indicated that GPS spot fumigation has excellent potential to greatly reduce fumigant usage while adequately managing the PRD complex.