Effect of Planting Date on Parasitism of Broadbean (Vicia faba) by Crenate Broomrape (Orobanche crenata)

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Abstract
Field experiments were conducted to study the phenology and growth of broadbean (Vicia faba L. ‘Alameda’) and crenate broomrape (Orobanche crenata Forsk. # ORACR) in relation to planting date. The establishment of crenate broomrape on broadbean planted between mid-December and mid-January coincided with the flower initiation on the crop. Establishment occurred during the vegetative phase, several weeks before flowering from a mid-November and mid-October planting. In general, no consistent relationships were observed between growth of the host and attachment or subsequent growth stage of the parasite. The maximum number of crenate broomrape plants successfully attached to the host as well as the duration of the underground stage of crenate broomrape decreased as broadbean planting was delayed. Broadbean dry weight decreased as infection rate increased. This effect was more intense in early than late plantings.