Spotted wing drosophila, or Drosophila suzukii, lays eggs in such valuable soft-skinned fruit as raspberries, blackberries, blueberries, strawberries and cherries. The eggs develop into larvae, leaving the fruit unmarketable.
Spring has arrived, but it sure doesn’t feel like it in many parts of the Northeastern U.S. However, the cool weather is buying us some extra time that can be used to review our pre-bloom disease management plans and familiarize ourselves with all the tools at our disposal.
Following an unseasonably warm month of March, a pair of cold fronts brought cold temperatures across much of the eastern United States in early April 2016. The cold weather was stressful, both for the fruit grower and the flowers!
We are seeing indications that the numbers of green fruitworms and rosy apple aphids will be high this season. Both pests tend to flare in a cool, wet spring due to suppression of predators and other biocontrols.
In a previous article, I had mentioned Closer (sulfoxaflor) insecticide as being registered for use on strawberries. It had been for a while, but last fall EPA issued a cancellation order for the product, after the federal Ninth Circuit Court of Appeals found that EPA improperly approved the registration.
Last month, we discussed new herbicides that have become available for use on berry crops in the last few years. In this article, we’ll cover changes with insecticides and miticides.
In light of the cold temperatures experienced recently, a call to your crop insurance agent may be in order. If you believe the recent low temperatures may have damaged your crop you have 72 hours to report the event to your insurance provider.
A series of advective freeze events have damaged fruit buds, and following an additional freeze this weekend, growers will want to assess crop potential. It can be discouraging to count the buds that didn't survive the cold, so focus on bud survival by using a technique Jim Schupp adapted from strategies to adjust crop load at thinning time.
Agriculture Handbook 66 (AH-66) represents a complete revision and major expansion of the 1986 edition. It has been reorganized and now includes 17 Chapters and 138 Commodity Summaries written by nearly a hundred experts in 792 pages.
The recent winter-like conditions do not kill scab spores and the spores continue to further mature and release. If the weather forecast comes to fruition, an apple scab infection event is predicted for April 7. If your trees have green tissue, recommendations for dealing with scab while managing cold injury are discussed.
The calendar still says March but it feels as though it is at least mid April. Be prepared to set out your sex pheromone traps earlier than normal, as they are the simplest tools to accurately establish biofix dates and to precisely monitor the trends in population development through the season. Warm temperatures resulted in increased activity of pear psylla adults, and pre-bloom application(s) of oil should slow down egg laying. San Jose scale nymphs become active when the sap begins to flow in the spring, and they should be controlled pre-bloom or during the first cover spray.
All current conditions point to an early spring and tree fruit bloom. At Rock Springs we had first bloom on Methley plums and pink on peaches on Friday March 25th. Last year we observed the same growth stage on April 29th!
During the 2016 Winter Tree Fruit Grower Meetings, this handout with tables was distributed for folks to use if they want to manually figure out infection periods for certain diseases (scab, fire blight, cherry leaf spot). Also included here is a table listing coppers available to manage bacterial spot during cover sprays.
Since 1980 weather patterns such as rainfall quantity and duration, temperature and extreme weather events have become increasingly erratic.
Aprovia is a new fungicide (SDHI, FRAC group 7) available for pome fruit disease management. Due to crop safety concerns, BASF will be cancelling the pome fruit registration for Vivando.
New this spring is the herbicide Broadworks from Syngenta. It is a new chemistry for use in tree fruits with the active ingredient being mesotrione. The chemical family is triketone with an HRAC of Group 27.
This planting was established in August 2014 and included 11 named cultivars with ‘Chandler’ and ‘Sweet Charlie’ as the standards for comparison. In addition, there were 3 advanced selections from the breeding program at Cornell and 3 advanced selections from the breeding program at Rutgers.
A top-three “warm episode” (El Niño) brought some widely expected winter weather impacts to the U.S., but also provided some surprises. For example, atmospheric warmth in part supplied by the balmy central and eastern equatorial Pacific Ocean contributed to the nation’s warmest Decembe to -February period on record.
If the rain that is forecasted comes to fruition, we will experience a major scab infection period late March 31–April 1. With temperatures averaging around 60°F, only 6 hours leaf wetness is needed to cause an infection event. Protection is needed for vulnerable green tissue.
Due to the presence of green tip on early varieties of apples combined with rain the last several days plus forecasted for the next two, we are in our first apple scab infection period for 2016. Protection is needed for vulnerable green tissue; a copper spray will be useful for trees not at green tip.