When counting the white lines on a Ten-lined June Beetle, count the middle line twice because it forms two separate lines once the wings open. The short lines on the sides of the elytra (wing coverings) also count as part of that ten. This Scarab Beetle is larger than others and can grow to almost 5cm, or 2 inches in length. Adults are harmless and do not cause any real trouble, but groups of their larvae can kill a tree, or stunt its growth, by devouring the roots. Often, the damage to the tree is unseen until it dies or falls over. These grubs live underground for 2-3 years, feasting on roots, which gives the tree no time to recover season after season. For this reason, the Ten-lined June Beetle is considered an agricultural pest. Ending an infestation is only possible by removing affected trees and those near them (even if they are healthy). The holes where the removed trees were are treated with an insecticide to prevent the next generation of trees from getting attacked. Covering soil with a phosphate-based insecticide between trees when adults are first seen can also help reduce population numbers. Apple trees and other orchard fruit trees are also food sources.
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* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the Ten-lined June Beetle may be found (but is not limited to). This sort of data is useful when attempting to see concentrations of particular species across the continent as well as revealing possible migratory patterns over a species' given lifespan. Some insects are naturally confined by environment, weather, mating habits, food resources and the like while others see widespread expansion across most, or all, of North America. States/Territories shown above are a general indicator of areas inhabited by the Ten-lined June Beetle. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.