ReTain tips for use 2009

Editor’s note: This article is from the archives of the MSU Crop Advisory Team Alerts. Check the label of any pesticide referenced to ensure your use is included.

ReTain is an ethylene blocker in apple and thus when applied delays apple maturity. Ethylene is involved in the ripening process of apples. The following six tips for use are to remind you of its use in apple.

  1. ReTain is dose dependent. Cutting the rate will reduce the delay in apple maturity.
  2. Maximum ReTain response is obtained by applying ReTain at 30 days before anticipated harvest at full rate per acre.
  3. Reducing the rate is often performed to manage harvest and is often used on sensitive varieties, such as Gala, Jonagold.
  4. When temperatures are hot during August, some varieties will not respond as expected to ReTain. This year was not a hot year, thus we predict your normal rates should provide good results.
  5. Reduced ReTain rates will still provide a benefit of cracking, greasiness, water core, bleeding and stop drop.
  6. Applying the organic silicone surfactant is required with ReTain, but the surfactant may increase the uptake of Captan and some leaf injury may result if Captan is applied near ReTain, (closer than four days before or after ReTain).

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