The answer to 'tree brown patches' is that there are several common causes, including drought stress, disease, insect damage, or nutrient deficiencies. Symptoms may include discolored, wilting, or dying leaves and branches. Solutions can range from adjusting watering and fertilization to treating pests or diseases, or even removing and replacing the affected tree.
If the brown patches are limited, you may be able to address the issue through DIY methods like adjusting watering, applying fertilizer, or treating for pests. However, for more severe or widespread problems, it's best to consult a certified arborist or landscaping professional who can properly diagnose the issue and recommend the appropriate treatment.