Adult feeding causes irregular shot holes. Under the right conditions, cottonwood trees are some of the best shade-providing trees in large areas. Larvae skeletonize leaves between the leaf veins. Larvae and adults feed on willow and poplar, with cottonwood being the most preferred. Leaf Beetles. Sprouts develop from the roots. Treatment is rarely necessary. I have tried mowing and pulling them, but there are tooo many. Cottonwood Leaf Beetle. The larvae are black and have white spots. Aphids, leaf beetles, canker fungus, fungal leaf spots, and root rot are just some of the problems these trees have. 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). Cottonwood Tree Uses. If so, I think it is a Cottonwood Leaf Beetle larvae. Adult beetles can be found on and around host plants during the summer. 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. Cottonwood leaf beetle adults and larva. Cottonwood leaf beetles are approximately 1/4 inch long and are pale yellow with black stripes. The cottonwood leaf beetle feeds primarily on cottonwood, but will attack other species of poplar and willows. It feeds on the foliage and has the ability to strip the tree bare if you don’t intervene. Now there are trees sprouting alllllll over the yard. Cottonwood leaf beetle: these small pests hibernate under the bark of the young cottonwood tree in the winter and come out in the spring. I am ready to start over and till the yard up and replant. In each case, the leaf damage appeared to be caused by an invasive insect called the viburnum leaf beetle, Pyrrhalta viburni. It is the only species in the genus Plectrodera. Cottonwood Borer, (Plectrodera scalator Fabricius) is found in the eastern US, New York. They prefer cottonwood… The larvae eat the tender insides of the leaves, while the adults eat the outer edges. Saturating the the soil at the tree’s base with insecticide is also recommended to kill the grubs still burrowing there. Treat the tree with organic neem oil to get rid of this beetle. I recently removed a cottonwood tree. If you spray too early or too late, the pesticide will not reach the leaf miner larva and will not kill the leaf miner flies. Suckers from nearby cottonwood tree Cottonwood tree suckers removed from lawn Closeup of cottonwood tree suckers removed from lawn. This is characteristic of cottonwood in an area where a cottonwood tree has been cut down. Although several beetle species like to feed on willow foliage, the cottonwood leaf beetle (Chrysomela scripta) usually causes the worst damage. My comment to Sara, for the homeowner, was: I think it is cottonwood. In heavy infestations tender terminals may be defoliated. Lacewing larvae, assassin bugs, and certain beetles also are common predators. Answer: Applying insecticidal soaps like Bonide Insecticidal soap. The trick to this method of how to kill leaf miners is to spray at right time. Cottonwood Borer. Birds sometimes feed on the larvae and pupae, although they usually prefer other insects. But the attached sheet below has some suggestions for controlling. can help control the larvae, and insecticides like Permethrin SFR can be used to prevent the adults from laying eggs. The larvae is more destructive than the adult, so you may not need to do anything if there are only a few. 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. And adults feed on willow foliage, the leaf damage appeared to be caused by an insect. 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