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Apples naturally shed some fruitlets in early summer, and this process is known as the ‘June drop’. This may look alarming but, in fact, is not usually a cause for concern as a good crop of apples is often left on the tree.
After apple trees flower, there is a period of fruit shedding. Although it appears dramatic, there is little that can be done to prevent the loss of fruit. Thankfully this is not as serious as it might appear. Although many fruits fall, sufficient usually remain attached and go on to develop into mature fruits.
Apples are large fruits and just 1 in 20 flowers setting fruit can constitute a full crop (or as many as the tree can support). In contrast, the loss of smaller fruits, such as cherries, is highly significant as more of the fruits must set to constitute a full crop (or as much as the tree can support until harvest).
Numerous fruitlets (ten-pence-sized fruits) are shed and fall to the ground. The peak is about eight weeks after flowering in early July, although fruit loss can often continue until mid-July. Earlier fruitlet losses are usually due to poor pollination or unfavourable weather after flowering.
June drop can be quite prolonged and it is unwise to commence thinning fruits until the fall is complete, just in case too many fruits are removed. Once the extent of natural apple losses are known, fruit thinning decisions can be made.
There are no preventative measures except to practise good cultivation.
If the June drop is severe every year and affects yields, the cultivation regime of the tree should be reviewed. Pruning to allow more light into the tree is one aspect that gardeners can try.
A lack of nitrogen is thought to be sometimes involved so attention should be paid to applying a general fertiliser such as Growmore each spring. However, be careful not to over-fertilise as excessive nitrogen can itself lead to fruit losses.
Insufficient soil moisture may contribute to fruit fall. Watering, followed by mulching, in dry spring weather may help.
There are three main factors associated with the June drop:
Apple pruningCherry fruit dropHarvesting fruit
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