Sprouts develop from the roots. Cottonwood Tree Uses. My comment to Sara, for the homeowner, was: I think it is cottonwood. Cottonwood Leaf Beetle. But the attached sheet below has some suggestions for controlling. It feeds on the foliage and has the ability to strip the tree bare if you don’t intervene. Saturating the the soil at the tree’s base with insecticide is also recommended to kill the grubs still burrowing there. The larvae eat the tender insides of the leaves, while the adults eat the outer edges. They prefer cottonwood… Under the right conditions, cottonwood trees are some of the best shade-providing trees in large areas. Although several beetle species like to feed on willow foliage, the cottonwood leaf beetle (Chrysomela scripta) usually causes the worst damage. It is the only species in the genus Plectrodera. The trick to this method of how to kill leaf miners is to spray at right time. If so, I think it is a Cottonwood Leaf Beetle larvae. The larvae is more destructive than the adult, so you may not need to do anything if there are only a few. The cottonwood borer (Plectrodera scalator) is a species of longhorn beetle found in the United States east of the Rocky Mountains that feeds on cottonwood trees. I recently removed a cottonwood tree. Cottonwood Borer, (Plectrodera scalator Fabricius) is found in the eastern US, New York. Suckers from nearby cottonwood tree Cottonwood tree suckers removed from lawn Closeup of cottonwood tree suckers removed from lawn. Adult feeding causes irregular shot holes. Leaf Beetles. These natural enemies often help to keep leafrollers at low, nondamaging levels, but even if natural enemies are present, large outbreaks of leafrollers occasionally occur. This is characteristic of cottonwood in an area where a cottonwood tree has been cut down. Larvae and adults feed on willow and poplar, with cottonwood being the most preferred. Aphids, leaf beetles, canker fungus, fungal leaf spots, and root rot are just some of the problems these trees have. Cottonwood leaf beetle: these small pests hibernate under the bark of the young cottonwood tree in the winter and come out in the spring. Cottonwood leaf beetle adults and larva. Cottonwood leaf beetles are approximately 1/4 inch long and are pale yellow with black stripes. In each case, the leaf damage appeared to be caused by an invasive insect called the viburnum leaf beetle, Pyrrhalta viburni. Birds sometimes feed on the larvae and pupae, although they usually prefer other insects. It is one of the largest insects in North America, with lengths reaching 40 millimetres (1.6 in) and widths, 12 mm (0.47 in). Adult beetles can be found on and around host plants during the summer. Treatment is rarely necessary. The larvae are black and have white spots. Answer: Applying insecticidal soaps like Bonide Insecticidal soap. Cottonwood Borer. 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