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Carrot, a highly profitable crop in Israel, is severely damaged by  Phelipanche aegyptiaca  parasitism. Herbicides can effectively control the parasite and prevent damage, but for optimal results, knowledge about the soil–subsurface phenological stage of the parasite is essential. Parasitism dynamics models have been successfully developed for the parasites  P. aegyptiaca, Orobanche cumana , and  Orobanche minor  in the summer crops, tomato, sunflower, and red clover, respectively. However, these models, which are based on a linear relationship between thermal time and the parasitism dynamics, may not necessarily be directly applicable to the  P. aegyptiaca –carrot system. The objective of the current study was to develop a thermal time model to predict the effect of  P. aegyptiaca  parasitism dynamics on carrot growth. For development and validation of the models, data was collected from a temperature-controlled growth experiment and from 13 plots naturally infested with  P. aegyptiaca  in commercial carrot fields. Our results revealed that  P. aegyptiaca  development is related to soil temperature. Moreover, unlike  P. aegyptiaca  parasitism in sunflower and tomato, which could be predicted both a linear model,  P. aegyptiaca  parasitism dynamics on carrot roots required a nonlinear model, due to the wider range of growth temperatures of both the carrot and the parasite. Hence, two different nonlinear models were developed for optimizing the prediction of  P. aegyptiaca  parasitism dynamics. Both models, a beta function model and combined model composed of a beta function and a sigmoid curve, were able to predict first  P. aegyptiaca  attachment. However, overall  P. aegyptiaca  dynamics was described more accurately by the combined model (RMSE = 14.58 and 10.79, respectively). The results of this study will complement previous studies on  P. aegyptiaca  management by herbicides to facilitate optimal carrot growth and handling in fields infested with  P. aegyptiaca .

Thermal Time Model for Egyptian Broomrape (Phelipanche aegyptiaca) Parasitism Dynamics in Carrot (Daucus carota L.): Field Validation