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

This Article Full Text 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 Google Scholar Articles by Inguagiato, J. C. Articles by Clarke, B. B. PubMed Articles by Inguagiato, J. C. Articles by Clarke, B. B. Agricola Articles by Inguagiato, J. C. Articles by Clarke, B. B. Related Collections Plant Growth Regulators Turfgrass Plant Disease Nitrogen

Anthracnose Severity on Annual Bluegrass Influenced by Nitrogen Fertilization, Growth Regulators, and Verticutting

Dep. of Plant Biology and Pathology, 59 Dudley Rd., Rutgers Univ., New Brunswick, NJ 08901-8520. New Jersey Agricultural Experiment Station Publication No. D- 12294-7-07

^* Corresponding author (murphy{at}aesop.rutgers.edu).

Frequency and severity of anthracnose epiphytotics, caused by Colletotrichum cereale Manns Manns sensu lato Crouch, Clarke, and Hillman, on annual bluegrass (ABG) [Poa annua L. f. reptans (Hauskins) T. Koyama] putting greens have increased over the past decade. This 3-yr field study evaluated the impact of N fertilization (4.9 kg ha^–1 every 7 or 28 d), mefluidide (ME; 0 and 0.106 kg a.i. ha^–1 yr^–1) {N-[2,4-dimethyl-5-[[(trifluoromethyl)sulfonyl]amino]phenyl]acetamide}, trinexapac-ethyl (TE; 0 and 0.050 kg a.i. ha^–1 every 14 d) [4-(cyclopropyl--hydroxy-methylene)-3,5-dioxocyclohexanecarboxylic acid ethylester], verticutting (VC; 0- and 3-mm depth every 14 d), and interactions of these factors on anthracnose of ABG mowed at 3.2 mm. Nitrogen fertilization frequency had the greatest influence on disease throughout the study; N applied at 4.9 kg ha^–1 every 7 d reduced damage 5 to 24% compared to a 28-d interval. The plant growth regulators, ME and TE, frequently interacted during the last 2 yr of the study; sequential application of ME and TE reduced disease 6 to 14% compared to plots that only received one of these plant growth regulators. At advanced stages of disease, the combination of 7-d N fertilization and ME and TE application had the greatest disease reduction. Verticutting had little effect on anthracnose severity.

Abbreviations: ABG, annual bluegrass • ME, mefluidide • N, nitrogen • PGR, plant growth regulator • PIGE, post-inhibition growth enhancement • TE, trinexapac-ethyl • VC, verticutting • WAT, weeks after treatment

All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has been obtained by the publisher.

Received for publication June 17, 2007.