Acrobasis shoot moth infestations were evaluated in a young black walnut progeny test for 4 years, from ages 3 to 6. Infestation levels were greatest on the largest trees in the fourth and fifth year after plantation establishment, and were declining by the sixth year. Acrobasis infestation appears to be a problem primarily on young trees less than 2.5 m in height. There was no evidence for genetic resistance to Acrobasis infestation in black walnut.
Rink, George; Weber, Barbara C.; Baines, D. Michael; and Funk, David T.
"Acrobasis Shoot Moth (Lepidoptera: Pyralidae) Infestation-Tree Height Link in a Young Black Walnut Plantation,"
The Great Lakes Entomologist: Vol. 24
, Article 4.
Available at: http://scholar.valpo.edu/tgle/vol24/iss1/4