Jhonathan Ephrath, Moshe Silberbush
The parasitic weed broomrape (Orobanche spp.) is chlorophylllacking root parasite that parasitizes many dicotyledonous species, causing severe damage to vegetable and field crops worldwide (Figure 1). Sunflower broomrape (O. cumana Wallr.) is a specific noxious weed of sunflower (Helianthus annuus L.). The overall objective of the current study was to evaluate the control efficacy of O. cumana in sunflower with imazapic. The specific objectives were: (i) to detect the effect of growing degree days (GDD) on the initial subsurface development of O. cumana on sunflower roots and (ii) to study the relations between O. cumana parasitism at different seedburial depths and at different seed densities, its development, and the efficacy of chemical control.
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