About 61% of the 2017-18 US corn crop was in good or excellent condition in the week ended September 17, unchanged from the last two weeks, data from the US Department of Agriculture showed Monday.
Some 13% of the corn planted was rated as "excellent" and 48% as "good," according to the data.
The good/excellent rating of 61% is 13 percentage points lower than the year-ago figure.
For the rest of the crop, 26% was in fair condition, 9% in poor condition and 4% in very poor condition.
USDA said 86% had reached the dent stage, compared with the five-year average of 90% and the year-ago pace of 92%, while 34% had reached the mature stage, compared with the five-year average of 47% and the year-ago pace of 50%.
USDA said 7% of the corn has been harvested as of September 17, compared with the five-year average of 11% and the year-ago pace of 8%.
The 18 states surveyed for harvested accounted for 94% of the 2016-17 corn acreage, the report said.
Front-month December corn futures settled 3.25 cents lower at $3.5150/bushel Monday before the release of the USDA report.
Corn is the main source of US-produced ethanol and also the main competitor for distiller's dried grains with solubles.
