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Pierce's Disease
Research Updates

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What is Pierce's Disease?

Pierce's Disease is a bacterial infection, which is spread by bugs that feed on grapevines, particularly the "glassy winged sharpshooter." Grapevines that become infected with PD can quickly become sick and die.

glassy-winged sharpshooter

Effect of GA3, ethephon, girdling and wiring treatment on the berry enlargement and maturity of Himrod grape

  • Author(s): Chung, Soon-Ju; Kim, Wol-Soo;
  • Abstract: Effects of GA3 dipping, ethephon spray, girdling and wiring of basal part of shoots on berry enlargement and maturity were investigated in Himrod grapes. Berry weight was increased by girdling and wiring regardless of GA3 dipping. Girdling resulted in higher soluble solids content, and earlier harvesting date as much as five days than that of control. Ethephon treatment shortened harvesting date as much as two days, however berry removal force (BRF) was reduced. Dipping the flower bunch in 50 ppm GA3 at full-bloom and 100 ppm GA3 10 days after full-bloom resulted in two fold berry enlargement and higher BRF, however soluble solids contents was decreased and harvesting time was also delayed. GA3+ girdling and/or GA3+wiring treatment resulted in the increase of berry enlargement, BRF, soluble solids, sugar/acid ratio as well as earlier harvesting date.
  • Publication Date: Feb 2000
  • Journal: Journal Of The Korean Society For Horticultural Science

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