UMass Extension Fruit Program
The UMass Extension Fruit Program's mission is to assist fruit growers with all aspects of horticultural and pest management. It is part of the Center for Agriculture, Food and the Environment within the College of Natural Sciences at the University of Massachusetts.
ReTain Recommendations for Harvest Management -- Apples (and pears and peaches)
From Jim Wargo, Valent USA
Thanks to Jim and UConn's Mary Concklin where these recommendations appeared in her e-mail newsletter...
A reminder that ReTain can be used on peach, nectarine, and plum for harvest management and improvement of fruit quality. From the ReTain label: Depending on cultivar, orchard conditions, and grower objectives, one or more of the following benefits will be associated with using ReTain on peach, nectarine, or plum:
• Improved harvest management
• Additional time for increase in fruit size
• Maintenance of fruit firmness
• Reduced preharvest fruit drop
• Improved fruit quality
• Enhanced storage potential
Apply one pouch per acre of ReTain to peach, nectarine, or plum one to two weeks prior to the anticipated beginning of the normal harvest period* of untreated fruit. ReTain efficacy requires that fruit and foliage receive thorough spray coverage. To ensure thorough coverage adjust water volumes based on tree size and spacing and use calibrated spray equipment (i.e., orchard air blast sprayer). Excessive spray application volumes that result in spray runoff will reduce product performance. In most cases, 100 gallons per acre has been shown to be effective. For optimal response, use ReTain with a 100% organosilicone surfactant. Use a final surfactant concentration of 0.05 to 0.1% (v/v) in the spray tank. To reduce foaming, add the adjuvant last and minimize agitation.
*The normal harvest period for a particular orchard block refers to that time when fruits not treated with ReTain would be harvested. To help determine the beginning of the normal harvest period, refer to historical trends for harvest dates and the “days from full bloom to harvest” interval for each cultivar in your area, and closely monitor the fruit maturity development for the current season.
With the heat wave and dry spell broken, for now, we are seeing an increase in SWD numbers in our monitoring traps. This means, of course, it's time to make sure you are up to speed on your management practices! Check out the Quick and Dirty SWD Recommendations for an overview and links to more detailed information.