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 Time to Thin! 
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Joined: Thu Jan 27, 2005 11:27 pm
Posts: 1188
Location: Yamhill County, Oregon
Post Time to Thin!
Don't count on the supposed June Drop -- it took me years to realize I needed to be responsible for that - not Nature 8)

Googling "fruit tree thinning" - here's the first site up: ... fruit.html

Though I'd never consider chemically thinning my fruit, I'm glad they update that info. Simple yet complete, I suggest you check it out.

The following is much more extensive; I'll paste it here (I think we've enough server space?):

"Fruit thinning is often an important step in consistently producing good quality fruit. It is a time-consuming task, but it can be very beneficial, especially for peach, plum and apple trees, according to LSU AgCenter horticulturist Dr. John Pyzner."

"Fruit trees will often set more fruit than is needed for a full crop. Several undesirable things can happen. Excessive weight from the fruit can cause tree limbs to break. Excessive fruit set often will result in small fruit with poor flavor. Excessive fruit set also can result in alternate bearing in which a tree will produce little or no fruit in the year following a large fruit crop."

"Pyzner says fruit thinning is generally most effective when it is done shortly after fruit set. Sometimes, however, fruit thinning a couple of weeks prior to harvest can result in larger fruit and less limb breakage."

"The LSU AgCenter horticulturist says although thinning will reduce the amount of fruit being produced, it improves fruit quality, which can bring higher prices. The importance of fruit thinning varies with different types of fruits."

"Fruit thinning is very important on peach trees," Pyzner says, noting that peach trees frequently set an excessive number of fruit. The heavy fruit crop can result in poor quality fruit and damaged trees."

"Fruit thinning should begin as soon as frost danger is over," Pyzner advises, adding, "Most fruit thinning is done by hand, which is very time consuming." Using sticks to break up fruit clusters and shakers to shake fruit off the trees are less time-consuming methods, but they do not produce consistent thinning."

"Fruit are generally thinned to 6-inch intervals on twigs. Early peach varieties are usually thinned to 10 inches because of the short time they have for the fruit to mature. When thinning, look at the number of fruit remaining on the tree and not at the ground. Looking at the ground will prevent you from removing enough fruit. Thinning is also a good time to remove damaged fruit. A properly thinned mature peach tree will usually have 700 to 600 fruit remaining."

"It takes fewer large peaches to make a bushel; therefore, the yield can remain good on thinned trees," Pyzner says. For example, he explains that a peach tree producing 2-inch diameter fruit will produce 3.4 bushels of 293 peaches each, for a total of 1,000 fruits. A tree producing 2 1/2-inch diameter fruit yields 4.4 bushels of 159 peaches for a total of 700 fruits. A tree producing 3-inch diameter fruit yields 6.1 bushels of 98 peaches each for a total of 600 fruits."

"Japanese plums, which include most plums grown in Louisiana, tend to overbear like peaches, Pyzner says. Fruit on these plums should be spaced 4-6 inches apart, and the fruit cluster should be broken up. Native plums do not need thinning unless heavily loaded."

"Apples frequently require thinning. There is usually a natural fruit drop in June. If excessive fruit remains, the apples can be thinned to 6-8 inches along the limbs. Thinning to one apple per fruiting spur can aid disease control."

"Pears are usually thinned only when very heavy crops are set and the trees might be damaged. Thinning is usually done a few weeks before harvest."

"Oriental persimmons are seldom fruit thinned unless a heavy crop threatens to damage limbs. Sometimes persimmons will fail to produce a fruit crop the year following a heavy crop. Fruit thinning during heavy crop years appears to reduce alternate bearing."

"Grapes, muscadines, citrus, figs, blackberries and blueberries are not fruit thinned. Grapes and muscadines are frequently pruned in the winter. This reduces the number of buds available to produce fruit clusters. The pruning results in improved fruit quality and also controls the size of the vines."

I've a 'scattered set' this year, very strange - hardly any Gravenstein's, but Granny Smith's like never before! Early vs. late bloom?

Last week I toured the orchard of HOS member Jerry Swanke[sp?] of Gaston; he'd just finished his thinning - from the same 3-wheeled hydraulic lift bucket with pneumatic pruners he'd demonstrated years ago during an HOS tour of his orchards. He leaves two apples per cluster, and that apparently works for him; but keep in mind - varieties like Gravenstein (apples) have genetically short stems and will push each other off the spur as they grow; they should never be left back-to-back.

So have at it - and have fun :D

Temperate Orchard Convservancy:

Thu Jun 28, 2007 2:17 pm

Joined: Tue Jul 10, 2007 9:02 am
Posts: 25
Location: Portland, OR
I learned the importance of thinning yesterday. I've just bought a house, and Sunday was the first night my family spent there. We woke up Monday to find a three-inch limb of the loaded plum tree on the ground -- in the (probably vain) hope of saving some fruit, we picked whatever was on the fallen limbs -- four grocery bags filled about 3 plums deep -- and we've started thinning the remaining branches. I think the tree will recover.

Later I hope to post some photos and ask for help ID'ing the plum variety; the leaves are green on top and purple on the bottom, stems are reddish-purple, and the plums are round (not elongated) and red, with yellow flesh. It's obviously grafted -- the rootstock is sending up some shoots with entirely green leaves, which I'll deal with after we're fully moved. Then I'll start worrying about the elderly standard apple as well....

Tue Jul 10, 2007 9:21 am

Joined: Thu Jan 27, 2005 11:27 pm
Posts: 1188
Location: Yamhill County, Oregon
I'm sorry to hear of the loss... But I've found the same on my own trees ~ with no excuse! Just not this year.

Maybe this heat will speed the ripening of my Japanese plums, but I've none near ripe. Yours sound like an ‘ornamental plum,’ size would be telling.

Make sure you saw a flush cut at the next limb back from the break; which may be the trunk. If it's still slightly attached... you could be amazed at how much 'juice' gets through to ripen the remaining fruit.

Keep in mind, this winter you may tie over a 'replacement limb' from any 'shoot or sucker' growing from the vicinity of the break. I've bent and tied (up to) 3 year old shoots to fill in such a hole, and after one growing season in the new position - they'll stay put.

If nothing else... welcome to the forum :wink:

Temperate Orchard Convservancy:

Tue Jul 10, 2007 1:17 pm
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