There are several reasons for the decline of agriculture in Hawaii, including globalization, the rising popularity of sweeteners other than sugar, the growth of tourism generated by the invention of jetliners, and rising land values.
I recall the ads in which C&H flogged its "pure cane sugar from Hawaii." Nowadays, its sugar probably comes from Brazil, Thailand or Vietnam.
Thank you for the info. Maybe they need to plant kudzu instead of these flammable dry grasses.