FIGURE 1.

Spectral signature of reflectance of non-infested (—) and infested (—) susceptible sunflower leaves. (A) Measurements taken at 23 days after planting (DAP), before Orobanche cumana tubercles became established; (B) 31 DAP, first attachment of O. cumana; (C) 36 DAP, 63% of all O. cumana attachments were established on the sunflower roots; (D) 51 DAP, O. cumana inflorescences emerged. (E) Resistance cultivar 36 days after planting. Lines represent means of eight plants; three measurements were made on each plant.