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Fruit drop can be linked to many different cause. Citrus normally shed large numbers of fruitlets shortly after blossoming in the spring and at early fruit set (pea size). However, it is also common for a sudden drop of small fruit (20 mm diameter) to take place in the summer, when warmer weather places stress on the tree.

Dec 10, If you experience a long period of high temperatures, coupled with heavy rains, you citrus trees may develop citrus canker.

While it usually does not cause the tree to drop its fruit, if the. Aug 06, Fruit drop is usually associated with the lower, shaded areas of the tree canopy. Fruit split is more severe in Valencia, Hamlin and Navel oranges. Grapefruit (and other acidic fruits like lemons and limes), Tangerines and Temple fruit are much less stumpcut.barted Reading Time: 3 mins.

Apr 21, Sometimes there may be several factors causing increased fruit drop in citrus.

JulieWied Original Author.

How does the fruit drop mechanism work in fruit trees? Fruit drop (also known as fruit abscission) is regulated by the balance of two endogenous (meaning from within) plant hormones, auxin and ethylene.

When the ratio of ethylene to auxin is higher, it induces the enzymes which dissolve cell wall components in the Estimated Reading Time: 8 mins.