HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Hardison, J. R. Search for Related Content PubMed Articles by Hardison, J. R. Agricola Articles by Hardison, J. R.

Chemotherapeutic Eradication of Ustilago striiformis and Uroeystis agropyri in Poa pratensis ‘Merion’ by Root Uptake of - (2,4-dichlorophenyl)--phenyl- 5-pyrimidinemethanol (EL-273)¹

A new systemic fungicide, -(2,4-dichlorophenyl)--phenyl-5-pyrimidinemethanol, supplied by Eli Lilly and Company³ under code EL-273, has controlled and apparently eradicated Urocystis agropyri (flag smut) and Ustilago striiformis (stripe smut) in infected plants Poa pratensis ‘Merion’ after a single application to soil in the root zone. Effective dosages for eradication of U. agropyri and U. striiformis were 7 to 8 mg in 600 ml soil containing plants with 15 to 20 shoots or 7 to 8 mg on 92 cm² of sod surface. Plants cured of both smuts remained smut-free for 48 weeks. Shoots infected with U. striiformis became chlorotic and died within 8 to 10 weeks after application of effective dosages of EL-273 and were replaced by healthy shoots arising from basal stem buds. Shoots infected with U. agropyri were not killed by minimum effective dosages and became smut-free by development of healthy leaf tissue from basal meristems of existing shoots. Healthy plants were only slightly affected by EL-273 at dosages effective for smut eradication. Applications of EL-273 at 0.25 mg in 600 ml soil or 0.5 mg on 92 cm² sod also controlled Erysiphe graminis (powdery mildew) in P. pratensis. EL-273 is considered promising for control of stripe smut and flag smut, both in turf and in grasses grown for seed.

Key Words: Stripe smut • Flag smut • Kentucky bluegrass

² Plant Pathologist, Plant Science Research Division, Agricultural Research Service, U. S. Department of Agriculture, and the Department of Botany and Plant Pathology, Oregon Agricultural Experiment Station, Corvallis 97331.

Received for publication September 5, 1970.