Northern Michigan FruitNet 2009
Special Alert
NW Michigan Horticultural Research Station
| Nikki Rothwell District Horticulturist |
Erin Lizotte District Fruit IPM/IFP Agent |
Bill Klein Farm Mgr, NWMHRS |
| Duke Elsner Agricultural & Regional Viticulture Agent |
September 1, 2009
RETAIN TIPS FOR USE 2009
Phil Schwallier, District Horticulturist
Clarksville Horticultural Experiment Station
ReTain is an ethylene blocker in apple and thus, when applied, delays apple maturity. Ethylene is involved in the ripen process of apple. The following 5 tips 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 harves full rate per acre.
3. Reducing the rate is often performed to manage harvest timing and is often used on sensitive varieties, (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 and 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 4 days before or after ReTain).
Insect and disease predictive information is available at:
http://www.enviroweather.msu.edu/home.asp
http://www.agweather.geo.msu.edu/agwx/forecasts/fcst.asp?fileid=fous46ktvc
http://www.cherries.msu.edu/
Fruit CAT Alert Reports
http://www.ipmnews.msu.edu/fruit/
Weekly CIAB Raw Product Report
http://www.cherryboard.org/Production2009.htm
This issue and past issues of the weekly FruitNet report are posted on our website at: http://www.maes.msu.edu/nwmihort/faxnet.htm
ACTUAL
AND PREDICTED DEGREE-DAY
ACCUMULATIONS
SINCE MARCH 1, 2009
Please send any comments or suggestions regarding this site
to:
Bill Klein, kleinw@msu.edu
Last Revised: 9-1-09
