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Germination, Growth, Development, and Control of Galinsoga

Published online by Cambridge University Press:  12 June 2017

J. A. Ivany  and
R. D. Sweet
J. A. Ivany
Affiliation:
Canada Dep. of Agr., Res. Sta., P. O. Box 1210, Charlottetown, P. E. I., Canada
R. D. Sweet
Affiliation:
Cornell Univ., Ithaca, N. Y., 14850
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Abstract

Hairy galinsoga [Galinsoga ciliata (Raf.) Blake] and smallflower galinsoga [G. parviflora Cav.] are widespread weeds in New York State. Freshly harvested achenes (seed) are not dormant and germinate in the field from early May until frost. Rate of germination but not final total percentage was stimulated by alternating temperature, with the fastest rate being at 30 C day and 20 C night and with a 16-hr photoperiod and 11,000 lux of light. Some seed in each seed-lot required light for germination. Both species were day-neutral with respect to flowering. Smallflower galinsoga produced its first flower after node seven and hairy galinsoga after node six on the main axis 6 to 8 weeks after germination. Decreasing light intensity 83% decreased fresh weight.

Information

Type
Research Article
Information
Weed Science , Volume 21 , Issue 1 , January 1973 , pp. 41 - 45
Copyright
Copyright © 1973 Weed Science Society of America 

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References

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