| In young fruits, a generalized necrosis sometimes forms, resulting in premature abscission of the fruit. |
| The presence and balance of plant hormones have been shown to affect abscission of leaves, flowers, and immature and mature fruit. |
| Moreover, physiological disturbances during early embryo development lead to seed abortion and fruitlet abscission. |
| Petal abscission was rare in the monocotyledonous flowers tested, and common in the eudicotyledons. |
| On the alternate host, Quercus, inconspicuous leaf spots occur, unless the infection is severe, in which case there may be some abscission. |
| High temperature conditions commonly cause flower abscission and seed abortion because of pollination failure. |
