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Germination and Emergence Characteristics of Common Beggar's-Tick (Bidens alba)

Published online by Cambridge University Press:  20 January 2017

Analiza H. M. Ramirez ,
Amit J. Jhala  and
Megh Singh
Analiza H. M. Ramirez*
Affiliation:
Citrus Research and Education Center, University of Florida/IFAS, 700 Experiment Station Road, Lake Alfred, FL 33850
Amit J. Jhala
Affiliation:
Citrus Research and Education Center, University of Florida/IFAS, 700 Experiment Station Road, Lake Alfred, FL 33850
Megh Singh
Affiliation:
Citrus Research and Education Center, University of Florida/IFAS, 700 Experiment Station Road, Lake Alfred, FL 33850
*
Corresponding author's E-mail: ahmramirez@ufl.edu
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Abstract

Common beggar's-tick is an annual weed commonly found in citrus groves in Florida. A series of laboratory and greenhouse experiments were conducted to determine the germination response of common beggar's-tick to various environmental factors that influence seed survival, germination, and dormancy. The results suggest that common beggar's-tick germinated over a wide range of temperatures (15 to 40 C) and in both alternating light and dark and dark conditions. New seeds (collected in 2010) germinated better than the old seeds (collected in 2007) at 15/10 C; however, at temperatures above 35 C, the old seeds germinated better. The highest germination was 95% at 25 to 30 C with old seeds compared to 78 to 86% at 20 to 30 C with new seeds. Germination of common beggar's-tick was inhibited at osmotic potential above −0.6 MPa and salt concentrations of 320 mM. Highest germination in common beggar's-tick was found under neutral conditions (pH 7); germination decreased sharply under increasing acidity and alkalinity. Emergence decreased as depth of sowing increased, with greatest germination (89 to 91%) occurring when sown at the surface (0 cm) regardless of seed age. No germination was observed when seeds were buried at 10 cm. Results of this study suggest that favorable temperature and soil pH, and adequate moisture in Florida ensures the germination and continued presence of common beggar's-tick.

Keywords

Common beggar's-tick, Bidens alba (L.) D.C.Depth of sowinglightosmotic potentialpHsalt stressseed agetemperature
Type
Weed Biology and Ecology
Information
Weed Science , Volume 60 , Issue 3 , September 2012 , pp. 374 - 378
Copyright
Copyright © Weed Science Society of America 

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