Method of Application of Uniconazol Affects Vegetative Growth of Pecan

in HortScience
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  • 1 Department of Horticultural Science, Texas A&M University, College Station, TX 77843-2133
  • | 2 Department of Horticultural Science, Texas A&M University, College Station, TX 77843-2133

Pollarded `Wichita' pecan [Carya illinoensis (Wang) K. Koch] trees received 2 g uniconazol (UCZ) per tree using four application methods (trunk band, canopy soil injection, crown soil injection, and crown drench). All application methods increased trunk diameter but reduced shoot length, number of lateral shoots per terminal, nodes per terminal, internode length, and leaflets per compound leaf. Only the crown drench reduced leaf area. Area and dry weight per leaflet, and leaflet chlorophyll concentration were not affected by UCZ application. Effectiveness in growth reduction, as assessed by shoot elongation, was crown soil drench > crown soil injection > canopy soil injection > trunk band > control. All application methods increased viviparity. However, total yield per tree, nut size, and percentage of kernel were not affected. Chemical name used: (E)-1-(p-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)-1-penten-3-ol (uniconazol).

Contributor Notes

Current address is Calhoun Research Station, Louisiana State University Agricultural Center, P.O. Box 539, Calhoun, LA 71225. E-mail address: cjgraham@agctr.lsu.edu
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