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Hairy Nightshade (Solanum sarrachoides) Interference in Dry Beans (Phaseolus vulgaris)

Published online by Cambridge University Press:  12 June 2017

Robert E. Blackshaw
Robert E. Blackshaw*
Affiliation:
Canada Res. Stn., Lethbridge, AB, Canada T1J 4B1
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Abstract

Field studies were conducted to determine the effect of varying densities of hairy nightshade and varying durations of interference on the biomass and seed yield of dry beans. As few as two hairy nightshade plants per meter of row reduced bean seed yield by an average of 13% over the 2 yr of the study. Increasing the density of hairy nightshade to 100 plants per meter resulted in bean yield losses of 77%. Hairy nightshade interference during the first 3 weeks after crop emergence was sufficient to reduce bean yields. Up to 9 weeks of hairy nightshade-free maintenance after crop emergence was required to prevent bean yield losses. Hairy nightshade was a prolific seed producer. At low infestation densities, over 45 000 seeds per plant were produced. Hairy nightshade seed production peaked at over 300 000 seeds m–1 at about 30 plants per m of row. Depending on the length of the growing season, 6 to 9 weeks of weed-free conditions after crop emergence were required to prevent hairy nightshade from producing viable seeds before the first killing frost in the fall. Results are discussed in terms of timing and longevity of control required to reduce hairy nightshade interference in dry beans.

Keywords

Hairy nightshade, Solanum sarrachoides, Sendt. # SOLSAdry beans, Phaseolus vulgaris L. ‘Pinto UI 111’Bean biomassbean yieldcompetitionharvest indexinterference thresholdweed biomassweed seed yieldSOLSA
Type
Weed Biology and Ecology
Information
Weed Science , Volume 39 , Issue 1 , March 1991 , pp. 48 - 53
Copyright
Copyright © 1991 by the Weed Science Society of America 

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