A sudden change in temperature ,be it cold or hot can lead to foilage turning yellow or brown and dropping off.
Many plants will drop their leaves as a result of overly wet and dry conditions,plants will oftentimes shed their foilage.
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Pranathi Thottempudi answered this
problems created by shedding of plants are high transpiration , temperature , winds , insufficient supply of water which results in wilting of leaves. etc
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Rahul Sharma answered this
The problems caused are as follow:-
Due to the leaves on the ground results in flood as it is difficult for the soil to absorb water.
Absence of sunlight makes it impossible for germination.
Due to the thick layer rain water gets collected on the ground resulting in the formation of micro-organisms and mosquito.