Trees do attempt to communicate with each other. They release a sort of phermone (?) which other trees can pick up. One of the best examples I can think of is the pine beetle. It gets between the bark and the wood, in the layer called the cambin (?). The cambin is the growing part of the tree. This the beetle eats. Once it has made a complete circle around the tree and cut the top of the tree off from the bottom the tree will die. Other trees slowly start making chemicals that don't taste good to the pine beetle. So it hits one and not another. But this is a very slow process and sometimes the beetles will overwhelm the trees before the respose can be effective. Especially where trees are close together and thick. When that happens then all the pines within the area are infected and eventually die.
What is amazing though is that the trees start a defensive tactic as a result of an infected tree nearby. Even though there is no communication line between them. It was eventually discovered what was the trigger.
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mmmm, food!! (maybe im wrong) (in fact it is likely lol