OSU Extension: Why Are My Apples Falling Off?
This is the time of year that is both disappointing and exhilarating for any fruit grower because of the phenomenon called “June drop." It is disappointing because of what you thought would be your best apple crop and your dreams of apple crisps and pies galore… suddenly begins to drop off the tree. But it’s okay because as a fruit grower, you know that most fruit trees will produce many more blooms than are needed by the tree to produce a full fruit load.
An apple tree in full bloom, will produce 10-15 times more flowers than needed for a healthy tree fruit load; consequently, the excess flowers, if left untouched, creates the branch breaking fruit load potential of 10-15 times more fruit than the tree can safely produce! This means that 90-95% of the fruits must fall off to avoid overloading the tree. If the apples don’t fall off, you’ll need to hand thin them anyway, just to make sure the remaining apples will size up properly. The exhilaration comes from knowing that what is left on the tree, if cared for correctly, will be your apple crop for this year!
In order to bear fruit, the trees must first produce flowers, those flowers in turn, must be pollinated and the ovaries fertilized for fruit to form and grow. Plants have one major function... that is to produce viable seeds to continue their species. In fruit trees, for a short period of time after the flowers fade, both fertilized and unfertilized ovaries (fruits) begin to develop. Typically, within a couple of weeks, the totally unfertilized ovaries, which are about the size of large peas, will drop off.
Bear in mind that for any fruit, the developing fertilized seeds regulate and control the expansion and development of the ovary flesh around the seeds; specifically, that yummy flesh, which we commonly call “fruit," is meant to provide nutrients to the seeds when they break their dormancy and begin to grow. Some partially pollinated and fertilized ovaries will continue to develop on the tree. Even though the fruit is often malformed and may have just a few viable seeds due to inadequate pollination, it still hangs there on the tree.
In apples and pears, when young fruits are about 0.5 to 1 inch in diameter, another or second fruit drop occurs, usually towards the middle to end of June; consequently, it is given the moniker of “June drop” by fruit aficionados. Fruit dropping this time of year is considered to be a direct result of competition among young, developing fruits. Research conducted by Cornell University at Geneva, NY indicated “fruit that can maintain a continuously high growth rate, stay on the tree. However, fruit that have a slow growth or slow their growth for several days will drop.”
This natural thinning process will remove some of the excess fruit, allowing the remaining fruit to develop properly. Watching fruit fall off the tree can be unsettling; especially, when you were thinking about all the pies you were going to make at harvest. Even though the numbers of fruits falling off due to this natural thinning process may initially seem too high, additional hand thinning for tree health is often necessary. Additional hand thinning of fruit will ensure that the fruit remaining on the tree will size up properly and will not negatively affect tree health. Leaving too many fruits on (overcropping) a tree, can damage the tree. In fact, overcropping on young trees, and choosing to do nothing because you have been looking forward to a bumper crop for years, is not a good combination. If that young tree is not strong enough or doesn’t have sufficient resources for its own health and growth, then encounters multiple periods of high heat and drought stress… it may drop ALL of the apples! And then the only pie you end up eating at harvest time might be… HUMBLE PIE!
EQUIP cover crop assistance offered
Last week the U.S. Department of Ag’s Natural Resources Conservation Service (NRCS) announced that a second round of funding through the Environmental Quality Incentives (EQIP) Cover Crop Initiative was being made available statewide. Unique to this announcement is that Fairfield County producers are eligible for this round of funding that offers financial assistance to plant cover crops in 2022. If interested the application period is short and you must apply by the July 5, 2022, deadline. Contact NRCS locally at 740-653-8154 for an application or more information.
Water Wisely
For vegetable crops that produce fruit (tomatoes, peppers, etc.), as well as those that produce edible bulbs and roots (onions, potatoes, carrots), these next few weeks are the critical period for irrigation. During this period of fruit, root and bulb formation, plants need very consistent moisture to avoid avoid physiological issues like blossom end rot and hollow heart . Make sure you continue to water wisely: water in the mornings, water at the base of the plants and use mulches to keep your soil moist.
The OSU Extension Office Update is compiled by Connie Smith, program assistant and master gardener coordinator with the Ohio State University Extension Office in Fairfield County.
This article originally appeared on Lancaster Eagle-Gazette: OSU Extension: Why Are My Apples Falling Off?
