Linear regression analyses were performed on data from 13 soybean [Glycine Max (L.) Merr.] field experiments to determine the relation between yield and larval numbers of Meloidogyne arenaria (Neal) Chitwood. The experiments were nematicide efficacy tests conducted in South Alabama using cultivars Ransom or Bragg during 1978, 1979 and 1980. The tests contained treatments with fumigants (DD, DBCP, and EDB) and systemic nematicides (aldicarb, carbofuran, oxamyl, and phenamiphos). Each experiment consisted of 14 treatments replicated eight times. Thus a total of 1456 paired observations (yield: larval numbers) were available for the study. Results indicated that yield losses are linearly and negatively related to larval numbers determined near harvest. The average regression coefficient for Bragg soybeans (tolerant) was approximately half as large as that corresponding to Ransom soybeans (susceptible). Results also indicate the possibility of significant seasonal influences on the value
