In heavy infestations tender terminals may be defoliated. They prefer cottonwood… Larvae and adults feed on willow and poplar, with cottonwood being the most preferred. Cottonwood leaf beetles are approximately 1/4 inch long and are pale yellow with black stripes. 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. I have tried mowing and pulling them, but there are tooo many. can help control the larvae, and insecticides like Permethrin SFR can be used to prevent the adults from laying eggs. If so, I think it is a Cottonwood Leaf Beetle larvae. Treat the tree with organic neem oil to get rid of this beetle. Lacewing larvae, assassin bugs, and certain beetles also are common predators. The trick to this method of how to kill leaf miners is to spray at right time. But the attached sheet below has some suggestions for controlling. Adult beetles can be found on and around host plants during the summer. Adult feeding causes irregular shot holes. Cottonwood Borer. Sprouts develop from the roots. The cottonwood leaf beetle feeds primarily on cottonwood, but will attack other species of poplar and willows. Although several beetle species like to feed on willow foliage, the cottonwood leaf beetle (Chrysomela scripta) usually causes the worst damage. Cottonwood leaf beetle adults and larva. Cottonwood Leaf Beetle. It is the only species in the genus Plectrodera. The larvae are black and have white spots. Now there are trees sprouting alllllll over the yard. Leaf Beetles. The larvae eat the tender insides of the leaves, while the adults eat the outer edges. 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). I recently removed a cottonwood tree. Suckers from nearby cottonwood tree Cottonwood tree suckers removed from lawn Closeup of cottonwood tree suckers removed from lawn. The larvae is more destructive than the adult, so you may not need to do anything if there are only a few. Treatment is rarely necessary. In each case, the leaf damage appeared to be caused by an invasive insect called the viburnum leaf beetle, Pyrrhalta viburni. Cottonwood Borer, (Plectrodera scalator Fabricius) is found in the eastern US, New York. 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. Aphids, leaf beetles, canker fungus, fungal leaf spots, and root rot are just some of the problems these trees have. Larvae skeletonize leaves between the leaf veins. Cottonwood Tree Uses. Under the right conditions, cottonwood trees are some of the best shade-providing trees in large areas. 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