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Effects of solar UVB on thrips density (A) and crop damage (B). Insect counts and damage assessments were carried out at the beginning of flowering (1996: line PI227687; 1997: all cultivars combined) as explained in Materials and Methods. Different letters indicate significant differences (P < 0.005) between treatment means; thin bars indicate SEs; the overall UVB effect in 1997 was significant at P < 0.0001, n = 4 independent plots per treatment.
