Follow the Harvard Press on FacebookFollow us on Facebook!  and TwitterFollow us on Twitter!

Thursday, May 17, 2012  ·  Contact Us Register  ·  Subscribe/Renew  ·  Login
 

 

The views expressed by Harvard Press bloggers do not necessarily represent the views of the Harvard Press. The Press is not liable for opinions expressed in the blogs or for the accuracy presented there.
 

Latest Posts
  • Retirement Your Way
    Widow


Harvard Blogs
Spray Schedule for Backyard Apple Trees

This year, I want some fricken’ apples from my trees. Not to whine, but I Deserve them. It’s been eight years since I planted my first set of fruit trees, and only my namesake Jonathan gives me any fruit. And it only gives me about eight apples' worth. The rest of my trees give me nothing but agita, as they say in the old country (i.e., New York).

There are a number of reasons why apple trees might not fruit. Let’s go through some of the popular theories and my thoughts about how they relate to my own specific situation, shall we?

1. Lack of pollinators. I’m hoping to host a beehive this year, to test this, but it could actually be a longshot as a solution, as there are at least five colonies of bees within a mile from my trees, so my orchard is probably within their range. My ornamental crabapple seems to fruit nicely, so I suspect that pollinators aren’t really the issue, much as I want to have a good excuse to keep bees. That said, I do have concurrent blooming here of my apple trees and wild violets and such, so I’ll try to mow down the pretty volunteers during the apple blooming period, to help the honeybees focus.

2. Lack of sunlight. It would unthinkably awful if I planted my orchard in too dark a location. I’m really hoping not. Fortunately, my most productive tree is in a relatively dark part of the orchard, and my reasonably productive vegetable garden gets equal light to several barren trees, so I am somewhat optimistic that lack of light is not the cause.

3. Lack of soil nutrients. Eh. The guy at Cooperative Extension didn’t think this was that likely, even though he’s the one who’d I’d pay to have the test done, so it’s probably not that.

4. The weird varieties I planted take longer. That’s actually fairly plausible, as they are all older varieties. Still, though, eight years seems like a long time to wait.

5. Lack of horizontal limbs. Horizontal limbs produce more fruit buds than vertical ones do, and by using branch spreaders and stakes, you can control this. It seems another longshot, but I’ll try to be more vigilant this year about spreading branches. I did get a fair amount of blossoming last year, though I’m not sure if I got “enough.” Paying attention to this is another of the year’s goals.

6. Overly zealous pruning. The theory is that by cutting out too much stuff, the tree responds with wanting more vegetative growth, rather than fruit buds. I'm suspicious that my pruning isn't moderate and appropriate, but I will lay back some, this year, and refrain from pruning most trees. Though, it's hard, man....

7. Lack of applied poisons. This is what I’m hoping the real issue is. I haven’t been spraying my trees at all, out of some wide-eyed notion that it’s best to avoid polluting the planet, and that my trees would produce fruit anyway. My operating theory was that I’d wait for a lot of awful fruit before I invested in spraying, which I’d do to improve the fruit a bit, but there’s some suspicion among those who actually have some orcharding experience that the nasties are terminating my baby apples before they get big enough to actually get recognized as baby apples.

The best book I know about raising apples is The Apple Grower, by Michael Phillips. It’s very thorough, and the 2005 edition is filled with helpful color photos. He takes an IPM/reasonably organic/eco-friendly approach, which involves paying careful attention to the trees and pest activity, and matching pests with a calculated, measured, preferably earth-friendly response. That’s the responsible approach to growing apples. It is also an engaging read, and I recommend it highly for anyone with a fruit tree, or even just a hankering for one.

Hooray for organic farming. But far easier and more common is the blanket approach. Apply wide-band toxins that kill everything in the orchard except the apples: curculio, earthworms, honeybees, grass, chickens, neighbors, whatever. Only the tree and the evil witch’s picture-perfect apples (like what we get in the supermarket) remain unscathed.

My hope had always been to follow the organic approach, but it’s time to be a little realistic. It’s been eight years, and I’ve been able to make exactly one pie and a quart of undrinkable liqueur from my twenty trees. Who am I trying to kid? Organic orcharding and I are currently rather fruitless collaborators.

So, with a certain degree of regret, but also practical resignation, I must say, alas, to Hell with the planet. At least, for a year or two. I’ve got to rule out the various local pests as a factor for why I get so few apples, and so I’m hoping to embark on a spraying program that will result in some fruit, for a change. This will at least give me a reasonably intelligent starting point from which I can then curtail my evil ways, moving forward, and be more thoughtful and measured. But this year, it’s “spray, baby, spray.” Of course, as an unlicensed amateur, there’s a limit to the kinds of toxins I can get a hold of, and I will actually still applying chemicals conservatively, compared to what goes on in commercial orchards, but it is certainly not organic. 

I’ve bought a backpack sprayer and just ordered a respirator and some magical potions.

My current intention is to spray three substances on the trees. They are:

• Dormant Oil. This goes on the tree when it is still dormant, and its job is to smother scale, mites, and scab.

• Fungicide: Immunox 61000 (Myclobutanil), to control fungi such as Cedar Apple Rust, scab, and such

• Insecticide: Triazicide Once and Done Concentrate (Gamma-Cyhalothrin), to kill insects such plum curculio, sawfly, tent caterpillars, leaf rollers, stink bugs, tarnished plant bug, leafminers, and so on. It sounds wonderful, except that it will also kill any nice honeybees that happen by, so the timing of this one particularly is fairly critical.

The way to time the applications is based on traditional stages of bud growth. For example, honeybees are vulnerable to accidental poisoning, and because I’m practically on a first-name basis with several thousand of the locals, I’ll lay off the insecticide when the trees are in bloom. Other applications are timed to coincide with lifecycles of the target critters, trying to catch them when they are most active and vulnerable. And I want to finish using the nasty stuff well in advance of when the fruit gets picked and consumed. The exact dates of when sprays are recommended will vary over the year, from region to region, and between apple varieties, and there are endless variations that commercial orchardists do depending on weather conditions and what critters they observe and what chemistry is in their arsenal; proper farmers have access to weaponry that we amateurs can’t legally procure.

Below, I’ve tried to assemble what I hope will be a reasonable pest-management schedule for a backyard orchard in Harvard, Massachusetts, balancing appropriate controls based on our area’s common pests, and so on. I hope that orchardists and gardeners with more experience can offer improvements and refinements to this plan, particularly if there are obvious deficits.

For the record, this is a schedule based on research but not actual experience, so take it for what it is.

The dates are estimates, based on how they fell in previous years, but the exact dates of bud stages will vary, depending on temperature. The bud stage must guide the application here, not the date.

Home Apple Orchard Spraying Schedule

April 2 (Dormant): Dormant Spray 1. Oil should be applied when there will be a 24 hour period where the temperature does not fall below 32 degrees (arguably, 40 degrees).

April 9 (¼-inch to ½ inch green tip): Combo Immunox and Triazicide.

April 15: Dormant Oil 2

April 22 (Pink): Combo Immunox and Triazicide.

Starting April 29 (Bloom): No spraying. Watch bees buzz while the blooms are on.

May 10 (Petal Fall): Combo Immunox and Triazicide.

May 24 (10 to 14 days after Petal Fall): Combo Immunox and Triazicide.

(Optionally, stop spraying. But better, follow up every two or three weeks with another combo spray. This year, I expect to try every three weeks.)

June 15 (5 weeks after Petal Fall): Combo Immunox and Triazicide.

July 10  (8 weeks after Petal Fall): Combo Immunox and Triazicide.

###

There have been many sources that informed the above schedule, most of which had great advice that I’m not following, particularly:

http://www.umass.edu/fruitadvisor/index.html

http://www.pronewengland.org/AllModels/MAmodel/MA-Belchertown-CalendarEarly.htm

http://ipmguidelines.org/treefruits/

http://www.applesource.com/growtips.html

http://orchard.uvm.edu/uvmapple/hort/99budstage/BudStageCriteria.html

http://extension.missouri.edu/publications/DisplayPub.aspx?P=G6010-2

http://www.uvm.edu/~organica/OrganicOrchardInformation/OrganicIPM/checklist.html

 Note: I've been periodically changing dates on the above schedule to match incoming information. This approach does not come from the perspective of a successful orchard! Just an accumulation of advice that I hope will lead from one.

 

Comments
 
Marc Sevigny
Monday, January 10, 2011 at 8:59 AM
I am a total hack and have little training, but I'll offer my opinions anyway.

1. I would seriously doubt the problem is lack of pollinators. You made the case yourself by noting that crabs are getting fruit.

2. Lack of sunlight. My observations suggest this might be a contributing factor. Your trees are not thriving as well as I would expect. Those that are taller seem leggy. You might need to gurdle your neighbor's historic Shaker spruce trees :-)

3. Rather than just testing soil nutrients, it might be worth examining soil drainage. Seems to me, on casual observation, there is quite a bit of ground moisture in your area.

4. Weird varieties. I have several of the same varieties, and they fruited in year 3.

5. I suspect your trees could have better form. The limbs do seem too upright. I used ground anchors and string for a season to bring them down.

6. I doubt you prune too aggressively every year. Iin fact, I think your trees could stand more heavy pruning. I think that taking off 1/3 of the branches or less is the rule of (green) thumb. I think that was only violated oonce, when I "pruned" your tree a few years ago.

7. I hope someone else can speak to this. I would guess that lack of spraying would have resulted in *some* additional fruit drop, but still plenty of fruit.

Some other things to consider...

1. Are you in a "frost pocket"? Might you be suffering from late damage after blossoms come out?

2. Have you watched what happens to the blossoms in the days/weeks following petal drop?

3. Having a mix of trees presents real problems for spraying. You will see that the trees reach spray stages at different times. Makes it very difficult to apply the critical sprays after petal fall, since adjacent varieties will still be blooming. I wait until all petals have fallen, and often get impacted by Plum Curculio, the bane of my orchard.

I'll be watching to see what I can learn from others' input.

Denis Wagner
Monday, January 10, 2011 at 9:52 AM
Hi Jonathan, A few remarks...Bloom is typically the first two weeks of May, most often around Mother's Day. Oil does not control scab and should be applied when temps are above 40. The first application at 2% the second application could be 1.5-2% and the latest application at 1% during tight cluster to early pink which is when the cluster buds are beginning to separate. Myclobutanil is a member of a new class of fungicide but its use has already developed resistant strains of apple scab. Such chemicals should never be used alone because it develops resistance to scab more quickly. It is best to use it with a protectant such as Captan or Mancozeb. A combination will be more effective on scab and Captan alone won't control powdery mildew or cedar apple rust. Follow the label rates exactly!!! Your insecticide of choice seems to be labeled for use on a wide range of tree fruit pests except mites, but it also has a very high toxicity to honey bees! An insecticide spray before bloom should not be necessary unless you experience unusually high numbers of leaf miners, plant bugs or european apple sawfly. If you need a prebloom insecticide you might try a spinosad like Esteem which you may be able to get from Fedco Trees. Then your first and most important insecticide spray should go on at petal fall. One or two more sprays after that to control plum curculio should go a long way to growing clean fruit. Use sticky red spheres hung beginning in July to trap apple maggot fly and you may eliminate your need for insecticide sprays later in the season. And now to address the reason for your blog post...Standard, as opposed to dwarf or semeidwarf apple trees can take up to 12 years to begin bearing fruit. If you planted your trees too deep (graft union at or below ground level) and they are now "scion rooted" the trees will be full size and be slow to produce. Semi dwarf trees should "begin" to bear fruit by years 7-8. Full dwarf trees should bear in 3-5 years in "ideal conditions." Your shaded site may delay fruiting by a year or two and excessive pruning and incorrect pruning can delay fruiting too. Specifically heading cuts will delay fruit bud formation. We have done mostly thinning cuts on your trees to direct growth or correct the structure. Admittedly one or two trees were pruned excessively (for leader correction) and respond with strong vegetative growth as you mentioned. So continue to be patient and you will grow more and more apples over the next few seasons. Happy growing!
Jonathan Feist
Monday, January 10, 2011 at 4:45 PM
Thanks to you both.

Denis, do you know of any specific pests that are likely to result in either preventing fertilization or in fruit drops at a very very early stage?

Interesting that you've found bloom to be so late. My note about April 22 came from observations last year. It will be interesting to see when it happens this year.

--Jonathan
Denis Wagner
Monday, January 10, 2011 at 6:55 PM
Jonathan,
In 18 years of commercial apple growing my earliest bloom was May 4. Last season was an exceptionally early bloom!
Fedco does have Esteem, listed in organic grower supplies, for $625 for 1#. Go to Dowagrow.com to see the label and where else to purchase it. The label gives very good instructions about how to measure in grams, the amount you would need for a few gallons of mix. I suggest your group of apple growers chip in and purchase a # together. Another warning is that it has a relatively short shelf life of 2 or 3 years.
As for pests that will prevent fertilization. Thrips are not a common problem, but will damage flower buds. Plant bugs will also feed on flower parts.
Remember the flower buds are produced in the summer before bloom so minimizing plant stress during that period of time may help generate flower buds. Marc had a good point about branches being weighted or pulled down. Branches closer to horizontal, rather than upright, will stimulate flower bud formation. Another mechanical technique that can help too by manipulating plant growth hormones is scoring or girdling the trees with a hand pruning saw below the bottom limbs. You should research this before just following my instructions here but I think the timing is when the new terminal growth is 4-6" long.
Jonathan Feist
Wednesday, January 26, 2011 at 8:56 AM
Very helpful, thank you!
Marc Sevigny
Wednesday, January 26, 2011 at 10:53 AM
Esteem appears to be an herbicide. How would that be a beneficial application to justify the $625 cost (even if shared among several growers)?
Denis Wagner
Wednesday, January 26, 2011 at 1:16 PM
"Esteem" is an insecticide, not an herbicide. However my above comments were about "Entrust", I often get these two names mixed up. Entrust is essentially non-toxic and labeled for organic use so I often recommend it. Its cousin Spintor is not organic and I have never priced it, available by the gallon. Entrust is labelled for use on thrips, leafminers, moths and caterpillars, and apple maggot fly. It is not labelled for use on european apple sawfly or plant bugs, both prebloom and/or petal fall pests.
I'm reminded that when making pest control decisions, there is no clear or definitive answer. In fact the gamma cyhalothrin insecticide you want to use Jonathan, is probably a restricted use pesticide and you will not be able to purchase or use it unless you are a certified pesticide applicator.
The Esteem I mentioned is another non-toxic insecticide, effective on san jose scale, pear psylla, leafmminers and aphids. Though leafrollers and codling moth are on the label, it's effectiveness is questionable.
For small and home orchard pesticide spray recommendations I suggest using materials that are inexpensive and/or available, in combination with disease resistant cultivars, as much as possible, and use of some traps, such as apple maggot fly traps, which are red spheres with tanglefoot applied. Available and inexpensive fungicides seem to be Captan, with Sulfur and/or Serenade as your organic choices. For insecticides, you may only find Sevin, and an organic choice may be garlic. You may find a few other options to chose from but they will require more research and web surfing. Also let's not forget oil as Jonathan suggested but don't expect it to control disease and it's effectiveness is primarily aimed at overwintering european red mite eggs, to reduce or delay the summer bronzing of the leaves by adult mites.
Mike Mintz
Wednesday, January 26, 2011 at 4:25 PM
Hi Jonathan,

I am reluctant to post with such experienced people as Marc and Dennis (Hey guys!), but here goes. I have a few acres of mostly old Baldwin apples. I get anywhere from 100 to 500 bushels a year.

Consider calling Bob Stanley from Shirley (978-425-2187). He is very experienced and very down to earth. And inexpensive to boot.

I do agree with your assessment that spraying is likely to be the cause. I was getting very very little fruit from my 50+ year old trees until I started a spray program. I use dormant oil, syllet (for one spraying), then switch to captan and Imidian. (Dennis, I would welcome any comments here.)

Good Luck !!

p.s. You are welcome to borrow my apple press at any time.

mike <> gmail
Jonathan Feist
Wednesday, March 16, 2011 at 10:18 AM
Mike, thanks for the offer of the press! I wish I had apples to warrant its use!
Mike
Friday, April 01, 2011 at 3:00 PM
Hi Jonathan,

You will some year !

Take Care,
mike
Norman W. Cross
Thursday, September 08, 2011 at 1:46 PM

I have an aopple tree in my back yard, variety unknown, that bears lots of apples ,even though I thin them a lot.Nice apples but along about August the tree starts to drop it's apples. Every day there are several apples on the grass. Usually about 20 apples a dy. Most of the apples seem to drop at night even thoug the temp is in the 50s.One day I noticed 30 apples on the grass.Any iidea why the tree drops all it's apples.? They are almost ripe , but not all the way. Sincerely. Norman Cross
Mike Mintz
Thursday, September 08, 2011 at 2:21 PM
Hi Norman,

Sounds like the tree is stressed. It may be too big for its root system. It may be not enough nutrients. How big is the tree? and how much air flow around the branches ?

Now having said that, apple trees do drop this time of year. On my full sized trees, 20-30 a day is common.

Sorry to be wishy washy, there are many variables.

Take Care,
Mike
Marc Sevigny
Thursday, September 08, 2011 at 2:40 PM
Norman, do you know what variety the tree is? Are you finding the fruit are easy to remove from the tree? Some varieties ripen earlier than others. I have varieties that are starting to lose their apples as well. It may be entirely normal.
Vanessa Cayford
Monday, January 02, 2012 at 1:30 PM
Hi Jonathan,

I too have backyard apple trees that do not want fruit out. I have had them for about 4 years. I tested the soil and found it was very low in lime. I have only sprayed once but will try it again this spring. Also will put the recommended lime down.. Good luck to us all. I do find it funny though that the nearby wild apple trees seem to be doing fine.
Jonathan Feist
Monday, January 02, 2012 at 2:57 PM
Four years is a little young for semi-dwarfs to fruit. Maybe some full dwarfs will fruit by then, but the larger trees need more time. And some varieties take a lot longer, even ten years before fruit shows. Catalogs often give (optimistic) estimates for how long it should take.
Mrs. G
Sunday, April 15, 2012 at 1:00 AM
Hi! I have had a home orchard for the past four years. I have fifteen trees, four of which are apples. I would never spray the combo of triazicide and immunox before petal fall. I just sprayed my apricots and peaches today. The rest of your spray schedule looks a bit like over-kill. After petal fall you should need two more combo sprays only, and perhaps one spray of Captan the end of July for Sooty Blotch and Fly Speck. Hope this helps.
Post Comment
 

Name (required)

Email (required)

Website

CAPTCHA image
Enter the code shown above:

CLICK AN AD!
Dinner at Deadline
Global Fitness
Bird House Organic Land Care
Marcus Lewis Day Camp
Whole Earth
Chimney Doctor
Colonial Spirits
Bull Run Restaurant
Gingersnap Bakery
Pinards
Copyright 2006–2012 by The Harvard Press LLC  ·  PO Box 284  ·  Harvard, Massachusetts 01451  ·  Phone 978.456.3700  ·  Fax 978.274.5605  ·  Terms Of Use  ·  Privacy Statement  ·  Site Credit