Answer: Grass can die out in the summertime if you're growing cool season grasses. They go dormant when the weather is hot but green up again when the weather cools. Or, dog urine can cause grass to die out, as can lack of sufficient water. You can rake out the dead grass and reseed, then keep it watered and it should eliminate the problem. As for the leaves on your trees, are they shriveled and black, or is there a black coating on the surface of the leaves? Shriveled leaves can indicate a disease or water stress; a black coating is called sooty mold and is the result of insect feeding. Aphids and mealybugs and to some extent scale insects, feed on the fluids within the tissues of the leaves. They excrete a stick substance called honeydew which can turn black. If you eliminate the insects, the black substance will weather away.
Hope this provides some insight!
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