Aphalara itadori

When the strains are crossed the Aphalara itadori individuals target all three species of knotweed (Giant, Japanese, and Himalayan).

Since these introductions knotweed species have spread throughout North America, Canada and Europe to establish themselves as a noxious weed.

Specifically, knotweed species have been seen to disrupt riparian habitats and lead to the degradation of waterways they invade.

[1] A four-year study in England and Wales found that the insects limited the growth of knotweed and did not breed successfully on ninety nearby native species, including the related species rhubarb, although it wasn't clear whether the insect colonies would be able to survive over the winter.

[5] After extensive research, Aphalara itadori has been shown to defoliate knotweed species substantially.

The deformity caused by Aphalara itadori feeding reduces the photosynthetic rate, competitive ability, growth, and total leaf area.

Some individuals of A. itadori displayed characteristics of an ability to adapt and grow on non-target plants.