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Identification of Grass and Morningglory Species with Simple Dichotomous Keys

Published online by Cambridge University Press:  12 June 2017

Edward C. Murdock ,
J. Bradley Guice  and
Joe E. Toler
Edward C. Murdock
Affiliation:
Agron. Dep., Clemson Univ., Clemson, SC 29634
J. Bradley Guice
Affiliation:
Agron. Dep., Clemson Univ., Clemson, SC 29634
Joe E. Toler
Affiliation:
Exp. Statistics Unit, Clemson Univ., Clemson, SC 29634
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Abstract

Agriprofessionals and technical college students took an examination without and with simple dichotomous keys. Without keys, only 15% and 30% of the agriprofessionals identified 71% or more of the grass and morningglory species (Ipomoea spp. # IPOZZ), respectively; 97% scored in this range for both weed groups with keys. Without keys, no student scored higher than 40% or 30% on grass and morningglory species, respectively. With keys, all students identified more than 60% and 50% of the grasses and morningglories, respectively. For grasses, only 3% of the agriprofessionals and none of the students achieved an excellent (>90%) score without keys, while 56% and 8% did with keys. Twelve percent and 65% of the agriprofessionals achieved an excellent score on the morningglory species without and with keys, respectively; 42% of the students scored higher than 80% with keys.

Keywords

Ipomoea spp.Convolvulaceae familyGramineae familyPoaceae familytraining of agriprofessionalsIPOZZ
Type
Education
Information
Weed Technology , Volume 2 , Issue 2 , April 1988 , pp. 198 - 205
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

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