Hawai'i's macadamia nut crop this season is expected to fall to 36 million pounds, a 38 percent decline from last season, the U.S. Department of Agriculture reported.

The expected decline was attributed to a number of factors, including mixed weather conditions. Some growers said wet conditions caused increased spoilage, while others reported their harvest was curbed by dry conditions during the critical phases of maturation.

In addition, a labor shortage resulted in some nuts going unharvested, according to the report.

An oversupply in the global market "has made marketing Hawaii macadamia nuts challenging," according to the report.

At the time the survey was conducted, nearly 67 percent of the estimated total crop was harvested.