"Digitaria Sanguinalis (l.) Scop., Echinochloa Crus-galli (l.) Beauv. And Setaria Faberi (herrm.) Interference And Subsequent Control In Container Grown Cornus X Baileyi, Juniperus Chinensis ""san Jose' And Potentilla Fruticosa ""gold Drop'"

A survey of the Illinois nursery operators revealed foxtail, quackgrass, crabgrass and barnyardgrass were the most prevalent grasses found infesting field and container grown ornamentals. Subsequently, randomized block designed experiments were conducted for two consecutive years to determine the influence of grass weeds growing in container grown ornamentals. Data indicated grass weed interference as early as 21 days with Cornus x baileyi, 63 days with Juniperus chinensis 'San Jose' and 42 days with Potentilla fruticosa 'Gold Drop'. By the termination of the interference studies, C. x baileyi shoot dry weight was decreased as much as 72%; J. chinensis shoot dry weight was reduced as much as 38% and P. fruticosa shoot dry weight was reduced as much as 75%. Additional experiments conducted disclosed no benefits in spacing containers further apart to commensate for weed interference effects. Chemical efficacy data indicated the possible use of fenoxaprop, haloxyfop and quizalofop, at recommended rates, to control E. crus-galli, D. sanguinalis and S. faberi growing in J. chinensis, P. fruticosa and C. x baileyi.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Horticulture

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2014

Author dc:creator

• Walker, Kandy Laine

• Agriculture, Agronomy

Identifier

(UMI)AAI8721779

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/71784