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