U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PubAg

Main content area

You searched for: Journal name Plant disease Remove constraint Journal name: Plant disease Publication year rev 8003-1997 Remove constraint Publication year rev: 8003-1997 Source 1997 v.81 no.3 Remove constraint Source: 1997 v.81 no.3
Start Over

Search

14  Search Results

1 - 14 of 14
Number of results to display per page

Search Results

1. Directional spread of Septoria leaf spot in tomato rows

Author:
Parker, S.K.; Nutter, F.W. Jr.; Gleason, M.L.
Source:
Plant disease 1997 v.81 no.3 pp. 272-276
ISSN:
0191-2917
Subject:
Septoria lycopersici; fungal diseases of plants; disease outbreaks; leaf spot; environmental factors; rain; Solanum lycopersicum var. lycopersicum
Abstract:
... Disease severity of Septoria leaf spot in rows of fresh-market tomato plants that were not staked was assessed in 1992 and 1993 following inoculation of the center plant in each row. Both temporal disease increase and spatial disease gradients were best described by the logistic model. Apparent infection rates for Septoria leaf spot epidemics averaged 0.282 day-1 (SE = 0.015, r2 = 0.96, P<0.0001) ...
DOI:
10.1094/PDIS.1997.81.3.272

2. Field transmission of grapevine leafroll associated virus 3 (GLRaV-3) by the mealybug Planococcus citri

Author:
Cabaleiro, C.; Segura, A.
Source:
Plant disease 1997 v.81 no.3 pp. 283-287
ISSN:
0191-2917
Subject:
plant diseases and disorders; disease vectors; spatial distribution; Vitis; disease transmission; Planococcus citri; disease surveys; incidence; disease incidence; Spain
Abstract:
... The spatial distributions of grape plants with symptoms of grapevine leafroll in nine vineyards in the Galician wine-growing region Rias Baixas (northwestern Spain) were analyzed. In five, significant aggregations of diseased plants and/or disease gradients toward one of the borders of the plots constituted indirect evidence of vector transmission by a nonflying vector. From 1991 to 1995, vines fr ...
DOI:
10.1094/PDIS.1997.81.3.283

3. Fusarium solani on soybean roots: nomenclature of the causal agent of sudden death syndrome and identity and relevance of F. solani form B

Author:
Roy, K.W.
Source:
Plant disease 1997 v.81 no.3 pp. 259-266
ISSN:
0191-2917
Subject:
etiology; Glycine max; Fusarium solani f. sp. phaseoli; new taxa; fungal diseases of plants; strain differences; host specificity; fungal anatomy
Abstract:
... Two morphological forms of Fusarium solani pathogenic on soybean, forms A and B, were further characterized and distinguished from other fungi. Questions regarding their identity were addressed. Soybean plants grown in the field and in a growth chamber were inoculated with Fusarium solani form A and F. solani f. sp phaseoli F. solani form A incited leaf symptoms typical of sudden death syndrome; F ...
DOI:
10.1094/PDIS.1997.81.3.259

4. Inhibition of Aphanomyces euteiches f.sp. pisi by volatiles produced by hydrolysis of Brassica napus seed meal

Author:
Smolinska, U.; Knudsen, G.R.; Morra, M.J.
Source:
Plant disease 1997 v.81 no.3 pp. 288-292
ISSN:
0191-2917
Subject:
volatile compounds; isothiocyanates; fungal diseases of plants; antifungal properties; Aphanomyces euteiches; disease control; hydrolysis; rapeseed meal; Pisum sativum; glucosinolates
Abstract:
... Seed meal from Brassica napus (rapeseed) produced volatile fungitoxic compounds potentially of value in the control of Aphanomyces root rot of pea. Hyphal growth, germination of encysted zoospores, and oospore survival and inoculum potential, were determined in the presence of volatiles produced from B. napus seed meal. Volatile compounds from B. napus meal completely suppressed mycelial growth an ...
DOI:
10.1094/PDIS.1997.81.3.288

5. Interaction of Ht and partial resistance to Exserohilum turcicum in maize

Author:
Lipps, P.E.; Pratt, R.C.; Hakiza, J.J.
Source:
Plant disease 1997 v.81 no.3 pp. 277-282
ISSN:
0191-2917
Subject:
Zea mays; inbred lines; Setosphaeria turcica; blight; disease resistance; genetic resistance; vertical resistance; genotype; fungal diseases of plants; disease severity; Uganda; Ohio
Abstract:
... Components of northern leaf blight resistance in maize due to race-specific resistance controlled by the Ht gene, partial resistance derived from inbred H99, and a combination of the two kinds of resistance, were studied subsequent to inoculation with Exserohilum turcicum race O. Lesion types, number of lesions (lesion number), percent leaf area affected (severity), and area under the disease prog ...
DOI:
10.1094/PDIS.1997.81.3.277

6. Sensitivity of Uncinula necator to benomyl, triadimefon, myclobutanil, and fenarimol in California

Author:
Ypema, H.L.; Ypema, M.; Gubler, W.D.
Source:
Plant disease 1997 v.81 no.3 pp. 293-297
ISSN:
0191-2917
Subject:
Uncinula necator; fungal diseases of plants; cross resistance; Vitis; disease control; triadimefon; myclobutanil; fungicide resistance; benomyl; fenarimol; chemical control; California
Abstract:
... Sensitivity of Uncinula necator subcultures to benomyl and the demethylation-inhibiting (DMI) fungicides triadimefon, myclobutanil, and fenarimol was assessed in 1993, 1994, and 1995 with leaf disk bioassays. In 1993, 1994, and 1995, 81.8, 96, and 96.7% of the subcultures, respectively, did not grow on leaf disks treated with 30 mg of benomyl per liter, whereas growth of the remaining subcultures ...
DOI:
10.1094/PDIS.1997.81.3.293

7. Two groups of phytoplasmas from Japan distinguished on the basis of amplification and restriction analysis of 16S rDNA

Author:
Okuda, S.; Prince, J.P.; Davis, R.E.; Dally, E.L.; Lee, I.M.; Mogen, B.; Kato, S.
Source:
Plant disease 1997 v.81 no.3 pp. 301-305
ISSN:
0191-2917
Subject:
strains; polymerase chain reaction; restriction mapping; restriction fragment length polymorphism; plant diseases and disorders; Phytoplasma; Japan
Abstract:
... Phytoplasmas (mycoplasmalike organisms, MLOs) associated with mitsuba (Japanese honewort) witches'-broom (JHW), garland chrysanthemum witches'-broom (GCW), eggplant dwarf (ED), tomato yellows (TY), marguerite yellows (MY), gentian witches'-broom (GW), and tsuwabuki witches'-broom (TW) in Japan were investigated by polymerase chain reaction (PCR) amplification of DNA and restriction enzyme analysis ...
Handle:
10113/18778
DOI:
10.1094/PDIS.1997.81.3.301

8. Virulence in Puccinia recondita f.sp. tritici isolates from Canada to genes for adult-plant resistance to wheat leaf rust

Author:
Kolmer, J.A.
Source:
Plant disease 1997 v.81 no.3 pp. 267-271
ISSN:
0191-2917
Subject:
rust diseases; plant development; genetic resistance; strain differences; gene interaction; Triticum aestivum; disease resistance; genes; Puccinia recondita; virulence; leaves; Canada
Abstract:
... Sixty-seven isolates of Puccinia recondita f. sp. tritici collected in Canada were tested for virulence to adult plants of Thatcher near-isogenic wheat lines with leaf rust resistance genes Lr13, Lr22a, Lr34, Lr35, and Lr13 and Lr34 combined. All of the isolates had low infection type to the Thatcher lines with Lr22a and Lr35. All isolates had lower infection type and lower rust severity on the Th ...
DOI:
10.1094/PDIS.1997.81.3.267

9. Characterization and pathogenicity of Thanatephorus cucumeris from sugar beet in Minnesota

Author:
Windels, C.E.; Kuznia, R.A.; Call, J.
Source:
Plant disease 1997 v.81 no.3 pp. 245-249
ISSN:
0191-2917
Subject:
Solanum tuberosum; Thanatephorus cucumeris; pathogenicity; temperature; strains; Beta vulgaris; Minnesota
Abstract:
... In 1993, hymenia of Thanatephorus cucumeris occurred on petioles of sugar beet leaves, but disease was not observed on leaves, crowns, or roots. Of 33 cultures isolated from sugar beet, 28 were identified as Rhizoctonia solani AG-3 (from four fields planted to potatoes in 1992) and five isolates were AG-5 (from one field planted to wheat in 1992). These isolates of R. solani AG-3 and AG-5 were non ...
DOI:
10.1094/PDIS.1997.81.3.245

10. Comparative morphology and pathology of Calonectria theae and C. colhounii in Hawaii

Author:
Uchida, J.Y.; Aragaki, M.
Source:
Plant disease 1997 v.81 no.3 pp. 298-300
ISSN:
0191-2917
Subject:
host range; Metrosideros collina; Calonectria; fungal diseases of plants; strain differences; pathogenicity; fungal anatomy; Hawaii
Abstract:
... Calonectria theae is distinguished from C. colhounii by perithecial color, number of ascospores in an ascus, longer stipes, longer conidia, and the formation of a second conidial type that is extraordinarily long, angular, and borne on simple, submerged, dichotomously branching conidiophores. Both species were isolated from ohia (Metrosideros collinus), M. excelsus, and sentry palm (Howea forsteri ...
DOI:
10.1094/PDIS.1997.81.3.298

11. Detection of phytoplasms in declining pears in southern Australia

Author:
Schneider, B.; Gibb, K.S.
Source:
Plant disease 1997 v.81 no.3 pp. 254-258
ISSN:
0191-2917
Subject:
Pyrus communis; detection; decline; diagnostic techniques; polymerase chain reaction; restriction fragment length polymorphism; Phytoplasma; South Australia
Abstract:
... Forty-nine pear tree samples collected in Victoria, most of them showing decline symptoms, were tested by polymerase chain reaction (PCR) analysis to detect phytoplasmas. Two universal phytoplasma-specific primer pairs, fP1/rP7 and fU5/rU3, were tested, but only fU5/rU3 amplified the phytoplasma DNA adequately. Nested PCR with universal and group-specific primers, however, proved more effective. T ...
DOI:
10.1094/PDIS.1997.81.3.254

12. Development of serological procedures for rapid and reliable detection of wheat streak mosaic virus in a single wheat curl mite

Author:
Mahmood, T.; Hein, G.L.; French, R.C.
Source:
Plant disease 1997 v.81 no.3 pp. 250-253
ISSN:
0191-2917
Subject:
Triticum aestivum; Aceria tosichella; disease vectors; Wheat streak mosaic virus; detection; rapid methods; assays; fluorescent antibody technique; microscopy; immunoblotting
Abstract:
... Wheat streak mosaic virus (WSMV) is transmitted by the wheel curl mite (WCM), Aceria tosichella. Immunofluorescent and dot-immunobinding assays were developed to detect the presence of WSMV in single WCM. Virus-specific immunofluorescent microscopy detected WSMV near the anterior end of viruliferous WCM. With dot-immunobinding assay, WSMV was detected in WCM fed on WSMV-infected wheat (Triticum ae ...
DOI:
10.1094/PDIS.1997.81.3.250

13. Races of Puccinia graminis in the United States during 1995

Author:
McVey, D.V.; Long, D.L.; Roberts, J.J.
Source:
Plant disease 1997 v.81 no.3 pp. 306-310
ISSN:
0191-2917
Subject:
Avena (Poaceae); Triticum; Hordeum; Puccinia graminis; races; monitoring; geographical distribution; rust diseases; disease surveys; United States
Abstract:
... Wheat stem rust overwintered in southern Louisiana, southern Texas, southwestern Georgia, northeastern Arkansas, and southwestern South Carolina in the winter of 1994-95. Wheat stem rust caused negligible yield losses in wheat in the United States. Races Pgt-TPMK and QCCJ made up 39 and 31% of all isolates, respectively. Race TPMK comprised 67% of isolates from farm fields. Race Pgt-QCCJ was most ...
DOI:
10.1094/PDIS.1997.81.3.306

14. Weather-based crop and disease advisories for peanuts in Virginia

Author:
Phipps, P.M.; Deck, S.H.; Walker, D.R.
Source:
Plant disease 1997 v.81 no.3 pp. 236-244
ISSN:
0191-2917
Subject:
Cylindrocladium; meteorological data; crop production; chemical control; Mycosphaerella arachidis; epidemiology; fungal diseases of plants; fungicides; models; Sclerotinia minor; disease control; weather forecasting; Arachis hypogaea; crop management; decision making; Virginia
DOI:
10.1094/PDIS.1997.81.3.236