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Modelling the demography of crenate broomrape (Orobanche crenata) as affected by broad bean (Vicia faba) cropping frequency and planting date

Published online by Cambridge University Press:  12 June 2017

Francisca López-Granados  and
Luis García-Torres
Francisca López-Granados
Affiliation:
CSIC Institute or Sustainable Agriculture, 14080-Cordoba, Spain
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Abstract

A mathematical model of crenate broomrape populations in broad bean as affected by cropping frequency and planting dates in the absence of crenate broomrape control practices was constructed using previously reported data. In consecutive broad bean cropping, broomrape populations reached a maximum infection severity (D) of 62, 47, and 30 emerged broomrape m−2 for early (mid-October), intermediate (mid-November), and late (mid-December) planting dates, respectively. The maximum D values were reached earlier as planting dates were brought forward, taking from 4 to 6 yr, starting from very low initial infections (D ≤ 0.2 emerged broomrape m−2). If broad bean was cropped every 3 yr, 15, 21, and 27 yr were needed, respectively, according to the model, to reach the maximum D for the three planting dates considered. A sensitivity analysis was conducted to determine the effect of changing the values of the main demographic parameters in broomrape life cycle (germination, attachment, and seed loss) on the output of the model under different management strategies (planting dates and cropping frequency). Generally, an increase in seed attachment and a decrease in seed loss affected broomrape population dynamics. Between the two processes evaluated, the time taken to reach the maximum infection severity (D) was less sensitive than the maximum broomrape population values. Model predictions were validated using results from long-term field studies at the late planting date sown every year. Simulated values generated good predictions (R2 = 0.82).

Keywords

Crenate broomrape, Orobanche crenata Forks. ORACRbroad bean, Vicia faba L.Parasitic weedsimulationsensitivity analysisORACR
Type
Weed Biology and Ecology
Information
Weed Science , Volume 45 , Issue 2 , April 1997 , pp. 261 - 268
Copyright
Copyright © 1997 by the Weed Science Society of America 

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