![Following is the structural formula of the principal sex pheromone of the Douglas fir tussock moth (Orgyia pseudotsugata), a severe defoliant of the fir trees of western North America. Several syntheses of Following is the structural formula of the principal sex pheromone of the Douglas fir tussock moth (Orgyia pseudotsugata), a severe defoliant of the fir trees of western North America. Several syntheses of](https://homework.study.com/cimages/multimages/16/73727362961906033484123202.png)
Following is the structural formula of the principal sex pheromone of the Douglas fir tussock moth (Orgyia pseudotsugata), a severe defoliant of the fir trees of western North America. Several syntheses of
![MCH Douglas fir and Spruce Beetle Repellent, Bulk, ISCA | Forestry Distributing North America's Forest Products Leader MCH Douglas fir and Spruce Beetle Repellent, Bulk, ISCA | Forestry Distributing North America's Forest Products Leader](https://www.forestrydistributing.com/images/thumbs/0000758_mch-douglas-fir-and-spruce-beetle-repellent-isca_275.png)
MCH Douglas fir and Spruce Beetle Repellent, Bulk, ISCA | Forestry Distributing North America's Forest Products Leader
![Natural and synthetic aggregation and antiaggregation pheromones of the... | Download Scientific Diagram Natural and synthetic aggregation and antiaggregation pheromones of the... | Download Scientific Diagram](https://www.researchgate.net/publication/377968326/figure/fig1/AS:11431281233763680@1712102545816/Natural-and-synthetic-aggregation-and-antiaggregation-pheromones-of-the-Douglas-fir_Q320.jpg)
Natural and synthetic aggregation and antiaggregation pheromones of the... | Download Scientific Diagram
![File:2015. MCH flakes. MCH is an anti-aggregation pheromone used to protect trees from attack by the Douglas-fir beetle. Wenatchee, Washington. (23630477478).jpg - Wikimedia Commons File:2015. MCH flakes. MCH is an anti-aggregation pheromone used to protect trees from attack by the Douglas-fir beetle. Wenatchee, Washington. (23630477478).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/2/22/2015._MCH_flakes._MCH_is_an_anti-aggregation_pheromone_used_to_protect_trees_from_attack_by_the_Douglas-fir_beetle._Wenatchee%2C_Washington._%2823630477478%29.jpg)