Biological control of turfgrass diseases with a rhizosphere competent strain of Trichoderma harzianum
Resource
Plant Disease 80(7): 736-741
Journal
Plant Disease
Journal Volume
80
Journal Issue
7
Pages
736-741
Date Issued
1996-07
Date
1996-07
Author(s)
Lo, C.-T.
Nelson, E.B.
Harman, G.E
Abstract
Trichoderma harzianum strain 1295 22 is a commercially available biocontrol agent that is strongly rhizosphere competent and able to control several plant pathogenic fungi. Two formulations were tested for their ability to control brown patch caused by Rhizoctonia solani, dollar spot caused by Sclerotinia homoeocarpa, and Pythium root rot and blight caused by Pythium graminicola. In growth chamber trials, soils planted with creeping bentgrass were amended with the granular formulation to give 106 cfu/g. All three diseases were significantly reduced by this treatment. Populations of Pythium spp. were suppressed under laboratory conditions by strain 1295-22. In field trials conducted over 4 years, strain 1295-22 reduced dollar spot severity relative to untreated plots. Monthly applications of granular or peat-based formulations of T. harzianum 1295-22 reduced initial disease severity by as much as 71% and delayed disease development by up to 30 days. The persistence of strain 1295-22 in soil core samples from treated creeping bentgrass greens was also measured. After application of strain 1295-22, soil populations of Trichoderma spp. increased 100-fold relative to populations in untreated plots. Population levels remained at least an order of magnitude greater in treated than in untreated plots. Even after overwintering, population levels remained at or above 105 cfu/g of dry weight of the sample.
Subjects
IPM
soilborne pathogen
topdressing
Publisher
American Phytopathological Society
Type
journal article
File(s)![Thumbnail Image]()
Loading...
Name
index.html
Size
22.12 KB
Format
HTML
Checksum
(MD5):12f0cd5621f82b13fd045875a67d0a77