Healthy Fruit, Vol. 26, No. 17, July 31, 2018

Jon Clements, Author (unless otherwise noted) and Editor

Contents

Upcoming pest events

Ag-Radar Summary

Upcoming meetings

The way I see it

Insects

Diseases

Horticulture

Hawkeye’s corner

Guest article

Facebook Me

Useful links

Thank you sponsors...

Upcoming pest events

Coming events

Degree days
(Base 43 BE)

Meaning?

Current accumulation, Belchertown, MA

2420

July has been well above average daily temperature, so I am guessing this is ahead of average too...

Apple maggot peak flight

2127 to 2642

Baited yellow sticky or red spheres should be out to monitor; Early varieties susceptible to injury, particularly Gravenstein, Ginger Gold, and a bit later Honeycrisp

Codling moth 2nd flight peak

1954 to 2684

Pheromone traps should be refreshed with pheromone and new sticky bottoms to monitor effectively for 2nd generationl

Lesser appleworm 2nd flight peak

2144 to 3071

?

Oblique-banded leafroller 2nd fight start

2219 to 2628

Time for Altacor, Delegate or similar if indicated, to target hatching larvae, in cooler locations; scout for signs of caterpillar feeding; consider monitoring for 2nd generation

Oriental fruit moth 2nd flight subsides

2026 to 2524

Hang pheromone traps or replace pheromone to monitor flight

Redbanded leafroller 2nd flight subsides

2166 to 2707

Does not generally seem to be a problem?

San Jose scale 2nd flight peak

2137 to 2493

?

Spotted tentiform leafminer 3rd flight start

2240 to 2629

Site specific, some have problems with STLM, others do not; if left to build and too many leaf mines, can lead to pre-harvest drop of particularly McIntosh

White apple leafhopper 1st brood adults subside

2195 to 2521

See Insects

Ag-Radar summary

Key insect life cycle and management dates

Note: for 2018, we have ten Massachusetts orchard locations subscribed to Ag-Radar: Amherst, Belchertown (2 locations), Brookfield, Deerfield, Easthampton, Groton, Leominster, Northboro, and Westhampton. The website for looking at AgRadar for these locations is:
http://extension.umaine.edu/ipm/ag-radar-apple-sites/. What follows is the AgRadar summary for the Belchertown location.

Apple Maggot Fly (AMF) -- Rough guess of peak AM trap captures is: July 31, Tuesday. Estimated dates for first and peak trap capture are only general guidelines because the effect of rain on soil conditions is not included in the calculation.

Dogwood Borer (DB) -- First dogwood borer egg hatch roughly: June 22. Peak hatch roughly: July 26.

Codling Moth (CM) -- Codling moth development as of July 31: 2nd generation adult emergence at 66% and 2nd generation egg hatch at 27%. 2nd generation 7% CM egg hatch:  July 23,  Monday, = target date for first spray where multiple sprays needed to control 2nd generation CM. 2nd generation 30% CM egg hgatch: August 1, Wednesday = target date where one spray needed to control 2nd generation CM.

Spotted Tentiform Leafminer (STLM) -- Third optimized sample date for 2nd generation STLM sapfeeding mines, if needed: July 25,  Wednesday.

White Apple Leafhopper (WAL) -- 2nd generation WAL found on apple foliage:  August 2,  Thursday.

Preliminary McIntosh Harvest Date Forecasts -- Date to apply ReTain to delay first harvest for apples which without treatment would be ready for storage harvest on September 6 is from Thursday August 9  to  August 16. Date to apply ReTain to delay maturity for 2nd, 3rd or 4th pick of those apples, without delaying start of harvest maturity, is from Thursday, August 23  to  August 30. Begin measuring actual McIntosh starch-iodine index no later than  Saturday, August 18. The Michigan formula estimates that non-spur McIntosh will reach starch index 4.0 and start the optimum harvest window for long term storage on Thursday, September 6. Using the Champlain Valley NY formula from Cornell Bulletin 221 ‘Predicting Harvest Date Windows for Apples,’ McIntosh maturity is forecast to reach starch index 6.0 in Belchertown-ColdSpring MA on Saturday,  September 15. (Yup, we are already talking about harvest.)

Upcoming meetings

No fruit-related meetings I know about?

The way I see it

Jon Clements

I don’t have much to say, except it has been wet, humid, hot, disease pressure (SBFS, rots, brown rot) is moderate-high, shade trees are showing signs of stress, it’s lush out there, Gala apples going from green to yellow, it’s time to do leaf nutrient analysis (every three years, see Horticulture), codling moth second generation is getting going (see RIMpro-Cydia chart below, harvest of early peach varieties well underway (Earlystar, July Rose, PF 8 Ball White looking good -- although not quite ready), brown rot rampant on some nectarines, mid-season peach harvest should begin next week (accelerated by weather forecast), not too late to do a little pruning on peaches to help color-up fruit, start of McIntosh harvest is just a little over 4 weeks away, etc. etc.

Insects

Jaime Pinero

Apple maggot fly (AMF) and leafhoppers

AMF: Continue to check red sphere traps and apply insecticides if 1-2 AMF are captured on unbaited red spheres or if 5-8 AMF are captured on odor-baited spheres. Remember that you can safely discount captures that occur within 7-10 days of a recent insecticide spray unless heavy rain has fallen in the interim.

LEAFHOPPERS: The immigrant potato leafhopper can be found in some orchards. Refer to the New England Tree Fruit Management Guide (https://netreefruit.org/apples/spray-table/9-summer) for a number of optional materials against high populations of leafhoppers. The table below shows important characteristics of the white apple leafhopper and the potato leafhopper.

Do you have any suggestions for articles on arthropod IPM? Please let me know!      

Contact info: jpinero@umass.edu; (413) 545-1031 (campus office); (808) 756-2019 (cell).

Diseases

Dan Cooley

Brown Rot

The wet and humid summer weather has brought on reports of brown rot on ripening peaches and nectarines. You may remember that we had some brown rot blossom blight and fruit rot on cherries earlier in the year. This tells me the fungus was around and active this spring.

In peaches and nectarines, brown rot works in two phases. There’s a blossom infection phase, sometimes severe enough to cause blight, oozing and twig dieback. Other times the infections start in new fruit, but don’t progress. That is, they don’t rot fruit until fruit starts to ripen. That’s the second phase of the disease. All brown rot in fruit doesn’t come from blossom infection, but a significant amount can.

The obvious way to suppress problems in ripening fruit is to manage blossom blight. It’s too late this year for those without a time machine, but keep it in mind for next year. Peaches should get two to three fungicide applications during bloom. And while I see few growers do it, mummies and dead twigs in trees and on orchard floors should get moved out of range of peaches before they bloom.

So what to do now if brown rot is coming on strong? After bloom, peach fruit remain relatively resistant to brown rot until three or four weeks before harvest. Then, especially in wet and humid weather, it’s important to apply fungicides to suppress infections and minimize spread.

Brown rot on a ripe peach. This one peach has thousands of spores, which can infect other fruit.

At this time, use the most effective fungicides, rather than captan. There are quite a few, though many of them are the same active ingredient. They include Fontelis, Gem, Indar, Inspire Super, Luna Experience, Luna Privilege, Luna Sensation, Merivon, Pristine and Tebucon. Bumper, Fitness, Propimax, Quadris, Tilt and Topguard are also effective.

Timing these sprays doesn’t sound very IPM-like. Norm Lalancette at Rutgers recommends a calendar program, 18, 9 and 1 day preharvest. This approach has given 95% control under high brown rot pressure in fungicide trials. Obviously, peaches are harvested by variety, so some adjustments will be needed.

Fungicide resistance is an issue in brown rot management, and the fungicides used at this time are prone to resistance development. Rotate active ingredients. Another reason to rotate: there are limits on how much of each can be used in a season. Read the label.  

After that, here’s a cheat sheet to help. For example, an Fontelis, Indar, Gem sequence will change a.i. each spray. This information, and much more, can also be downloaded in the MyIPM app from either the Apple App Store (search for MyIPM) or Google Play.

Efficacy: higher is better

Screens from the MyIPM app, a great tool for resistance management and pesticide information.

Horticulture

Jon Clements

NOW is the time to do foliar nutrient analysis if you have not already done so. As a rule of thumb, it should be done every three years on a block/variety basis. That being said, it truly is the best way to get a handle on the nutrient status of your apple/pear/peach/cherry trees. OK, below are specific links to help you get the job done. Frankly, I just submitted a sample to Waypoint Analytical last week, mailed leaves on Wednesday and had results back on Saturday. I like instant gratification, and in this case, it helps me with a ground-truth check of what the trees are looking like, and it is not too late to make some nutrient/fertilizer applications -- or stop nutrient/fertilizer applications -- as dictated by the leaf nutrient results.

Soil/tissue testing labs

UMass Soil and Plant Nutrient Testing Laboratory

Dairy One Plant Tissue Testing Services (formerly Cornell Nutrient Lab)

Waypoint Analytical

Spectrum Analytic

University of Maine Analytical Lab

Basic nutrient management plan for tree fruit growers

Plant Tissue Sampling for Determining Fertilizer Needs of Fruit Crops

Hawkeye’s corner (notes from the field)

Liz Garofalo

A line up not so usual suspects…

While apple maggot fly and brown rot are hot on the tail of the fruits of your labor, other critters lurk just around the corner (or under the leaf, as it were).

Adult leaf weevil feeds on foliage (ahem, hence the name) of fruit trees, like the hazelnut pictured here.  Another foliar feeder also likes hazelnuts (and whatever else it can get it nasty little mouthparts on):

Banded tussock moth larvae can be a real pain, due to the stinging nature of the hairs along their bodies.  Thankfully, however, neither insect are usually of economic concern.

Spotted wing drosophila, on the other hand, can indeed be a problematic pest in peaches if certain measures are not taken to prevent damage.  Like removing obvious breeding sites and readily compromised fruit from the canopy (and the understory). (Ed. note: sanitation is a basic IPM practice.)      

Likely bird damage opened the door to brown rot which has subsequently softened the fruit up, making a safe haven for fruit flies, including SWD.

Brown rot on this peach is poised, ready to jump to its healthy neighbor at the first chance, while providing easy access to SWD that may be hanging out in the shaded, humid canopy.

 

Summer pruning, a clean understory and removal of fruit with open wounds will go along way to reducing likelihood of further damage to peaches by SWD (and will reduce disease pressure too!).  Should you need to make an insecticide application, please refer to this year’s stone fruit material list, courtesy of Mary Conklin, that can be found on the UMass Fruit Team’s website.

Don’t forget to check out Ag-Radar’s Honey Bee Activity Chart!

Guest article

Ed. note. As some of you may know, I am very fortunate to have Liz Garofalo, Lyndsey Ware, and Cam Olanyk helping out this summer. All are fully or partially funded by an iPiPE intern grant. I would encourage you to consider downloading the iPiPE Lite app on your smartphone, taking a bit of time to set it up, use it while scouting your orchard (you do scout your orchard, right?) and -- as it says on iPiPE.org -- “There is a critical need to develop a national infrastructure of professionals who routinely monitor crop health and pest incidence then share this knowledge enabling dissemination of mitigation measures to limit food security impairment.” A fancy way of saying “your observations contribute to a national effort to track pests and particularly if they present a critical threat (like BMSB).” To that end, Cam and Lyndsey have prepared a nice set of instructions here on how to use iPiPE Lite. Enjoy.

Links to iPiPE Lite

Google Play: https://play.google.com/store/apps/details?id=com.zedxinc.ipipelite

Apple App Store: Search for iPPE Lite

Directions for getting and using iPiPE Lite: http://bit.ly/2twatrF

Lyndsey Ann (Ware) > iPiPE Intern Blog (on Google+) July 28, 2108

Yesterday (Friday),  I silently accounted for the previous days.  I perused the week's events and information trying to select a subject to write about.  That unseen process would sound something like a jumbled news brief delivered by the reporter who gets way to excited about each topic... all to be covered within 2.5 minutes.

"Pest numbers remain low in our  Massachusetts Malus Fruit trees with a re-emergence of Codling moth observed in Leominster area.  The second generation of Codling moth reflects current models and most growers prepared ahead of time.  Pest management of these grey winged suspects requires decisions to be made during the larvae & egg stages of its life cycle.

Apple maggot flies join the new-age Codling moths on the scene.

Apple trees continue to get hand thinned... Mcintosh exhibiting signs of scab more than other varieties as expected.

Monday's sporadic rainstorms and high winds caused a few grafted tree casualties at UMass Cold Spring Orchard. The aspiring cider trees were secured that afternoon. Four to six trees may have been lost.

It's peach picking time. Some are beautiful.  Others are literally rotting on the trees or being devoured by the "birds & the bees."  (note: this line would be tossed by any broadcast editor on account of being cliche' and sounding sing-songy.)  Brown rot was identified as one cause for most of the rotten fruit.

Evaluation of the peaches indicated that some are ripe while others could stand a few more days in the sun.  Interestingly, despite first bite impressions, sugar analysis indicates apples are sweeter than peaches.

The UMass Fruit Team spotted Cedar Apple Rust on a group of young apple trees.  The trees, being part of Apple scab research, were labeled and dated enabling the team to isolate the two weeks in May when that location was susceptible to Rust.

More on pests and peaches next week.  I'm Lyndsey Ware with UMass Fruit Team & Extension.  Thank you for listening and have a peachy weekend everyone."


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Useful links

UMass Fruit Advisor: http://umassfruit.com

Scaffolds Fruit Journal: http://www.nysaes.cornell.edu/ent/scafolds/

Network for Environment and Weather Applications (NEWA): http://newa.cornell.edu

Follow me on Twitter (http://twitter.com/jmcextman) and Facebook (http://www.facebook.com/jmcextman)

Acimovic Lab at Hudson Valley

Peter Jentsch's Blog

The next Healthy Fruit will be published on or about August 14, 2018. In the meantime, feel free to contact any of the UMass Fruit Team if you have any fruit-related production questions.

Thank you sponsors…

Orchard Equipment and Supply Company, Inc. Conway, Massachusetts

Nourse Farms