The discovery attracted the attention of Irving Woodlands, a division of the Canadian forestry conglomerate J.D. Irving Woodlands is ramping up production of the trees in a newly opened greenhouse in New Brunswick. Credit: Courtesy of Irving WoodlandsDeveloping the resistant trees took a lot of detailed steps, Irving Woodlands scientists said. The trees with the fungus reduce budworm survival by 30% and reduce defoliation by the same percentage. The beneficial relationship also can help with overall tree health, making the trees with the fungus more drought tolerant.