Prunus dulcis is a source of food for many. It is a primary producer, meaning it makes its own food, and the fruit of the tree is consumed by various mammals and birds.  The trees also have many heavily pollinated flowers which attract pollinating insects to them as well.  Almond orchards are common in California and are utilized by many humans.  Not only are humans able to eat almonds and obtain a nutritional value, many make a living off of harvesting almonds. 

Almond trees are in danger of diseases caused by parasitic relationships with fungi.  Some of the most common interactions with fungi are:
-Brown Rot:  This disease is when a fungus, Monilinia laxa, form conidia on the tree which create cankers that infect the shoots and blossoms of the Prunus dulcis tree. 
-Shot Hole:  This disease is when a fungus, Wilsonomyces carpophilus, infects the leaves as they emerge from the bud, creating lesions on the leaves and fruit.  This leads to defoliation and causes the young fruit to drop.
-Scab:  This disease is caused by the fungus, Cladosporium carpophilum, which creates greasy black spots on the leaves and can cause a whole almond tree to defoliate in a short time.
-Anthracnose:  This disease is caused by the fungus, Colletotrichum gloeosporioides, which creates deep lesions on the fruit, the wood, and the leaves.  
Mychorrihzal fungi:  This fungus is causes a positive impact on the tree.  This fungus exchanges nutrients such as nitrogen, phosphorous, and water with the plant. 

A few other negative, disease related relationships with the almond tree are: Witches Broom, Conks, Crown Galls, Nematode Lesions, and Root Knots.
Nematode lesions:  This is caused by the parasite, Pratylenchus, which eats the end of the trees roots and produce lesions causing obstruction of the flow of nutrients through that root. 
Root Knots:  This is caused by the parasite, Meloidogyne, which feed on the root causing it to swell and create a knot like structure causing the root to be stunted. 
Crown Gall:  This is caused by the bacteria, Agrobacterium tumefaciens, which grow large structures at where the root meets the stem which can cause the plant to be stunted in growth.  

Almost an almond expert! It has all been interesting but learn some more interesting facts!