From May through July billions of Cicadas will start to emerge from underground. The nymphs cause damage by feeding on the roots of plants. To minimize damage we recommend protecting your plants by covering them with garden fabric.
In the final nymphal instar, they construct an exit tunnel to the surface and emerge. They then molt (shed their skins) on a nearby plant for the last time and emerge as adults. The abandoned exoskeleton remains, still clinging to the bark of trees.
Cicada nymphs suck sap from the xylem of various species of tree, including oak, cypress, willow, ash, and maple. While it is common folklore that adults do not eat, in reality they do have their own sucking mouthparts, and also drink plant sap.
After mating, the female cuts slits into the bark of a twig, and into these she deposits her eggs. She may do so repeatedly, until she has laid several hundred eggs. When the eggs hatch, the newly hatched nymphs drop to the ground, where they burrow. Most cicadas go through a life cycle that lasts from two to five years. Some species have much longer life cycles, such as the North American genus, Magicicada, which has a number of distinct "broods" that go through either a 17-year or, in some parts of the world, a 13-year life cycle. These long life cycles perhaps developed as a response to predators, such as the cicada killer wasp and praying mantis. A predator with a shorter life cycle of at least two years could not reliably prey upon the cicadas. Read more from Wikipedia
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