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A field experiment was conducted in Live Oak, Fla., to determine the effect of yellow nutsedge ( Cyperus esculentus  L.) (YN) density and time of emergence on the yield of direct-seeded squash ( Cucurbita pepo  L.). YN densities (0, 20, 40, 60, and 100 plants/m 2 ) were established from tubers planted at different times onto polyethylene-mulched beds, so that YN would emerge the same day as the crop or 5, 15, or 25 days later than the crop (DLTC). YN was not controlled after its emergence. The extent of squash yield loss was affected by YN density and time of emergence. When YN emerged the same day as the crop, the yield of squash was reduced by ≈7% (20 YN/m 2 ) to 20% (100 YN/m 2 ). When YN emerged 15 DLTC, crop yield loss was ≈13% at the density of 100 YN/m 2 &gt;. Regardless of density, YN emerging 25 DLTC did not significantly reduce crop yield as compared to weed-free squash. Thus, in soils with high YN densities (≈100 viable tubers/m 2 ) herbicides and/or other means of YN suppression in squash should be effective for at least 25 days after crop emergence to prevent significant yield loss. If squash yield losses  25 DLTC. However, YN emerging during the first 15 days of the squash season may produce tubers, which could increase the YN population at the beginning of the following crop season.

Density and Time of Emergence of Yellow Nutsedge Affect Squash Yield