Japanese adult beetles damage plants by skeletonizing the foliage. Experts with Washington State University (WSU) fear the beetle could make its way across the state within two decades if steps aren’t taken to stop them.
Popillia japonica —The beetle invades more than 300 local plants, including roses, grapes, and hops. Japanese adult beetles damage plants by skeletonizing the foliage. Experts with Washington State University fear the beetle could make its way across the state within two decades if steps aren’t taken to stop them.
If a trap detects multiple beetles, the state’s response becomes a main priority as the potential for Japanese beetles to establish themselves in Washington becomes a significant concern, according to WSDA. The department revealed the Oregon Department of Agriculture estimated that if Japanese Beetle were to establish, the economic impact on their crops, commodities, and other related businesses could be approximately $45.5 million.
“This is an excellent example of just how important agency collaboration is,” Camilo Acosta, WSDA’s Japanese beetle eradication project coordinator, said in a prepared statement. “A single beetle is less cause for concern because one beetle can’t reproduce. But we need to be sure there are no more. Last year, a single beetle was found in Richland, but extensive trapping in the area did not detect additional beetles.
“Preventative pesticides for grubs need to be applied before adult beetles lay eggs in July and August,” WSU wrote in a handbook on dealing with Japanese beetles. “It kills eggs and helps control next year’s grub population. Labels often say ‘Season Long Control.'” In 2020, WSDA detected two Japanese beetles near Grandview and one near Sunnyside. Over the next two years, WSDA trapped over 24,000 and 23,000 beetles within the same area. Beetles were also trapped in Wapato in 2022. This year, teams have caught approximately 6,600 beetles., especially if you live in Yakima, Benton, or Franklin counties.
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