The phrase "major producer" refers to someone or something that creates or produces a large amount of a particular thing. It typically implies that they have a significant impact or influence in the production of that thing. Full definition
Most major producers of baby diapers sell diapers especially designed for baby girls. (pregnancy-info.net)
Despite falling share prices, several major producers of agricultural nutrients had managed to steadily raise their dividends in the past five years. (fool.com)
The growing increase in demand for sweet potatoes has major producers making changes in many directions in order to keep up the stride to meet those demands. (producenews.com)