Search Results

You are looking at 111 - 120 of 868 items for :

  • "chlorosis" x
  • Refine by Access: All x
Clear All
Free access

Bärbel Röck-Okuyucu, Meltem Bayraktar, Ismail Hakki Akgun, and Aynur Gurel

types and concentrations of PGRs on the in vitro shoot growth of Stevia rebaudiana . PGR-supplemented media caused the formation of significant chlorosis and necrosis ( Fig. 2C and D ). WPM supplemented with 2.32 μ m Kn + 2.85 μ m IAA or 5.37 μ m NAA

Free access

Brian A. Krug, Brian E. Whipker, Jonathan Frantz, and Ingram McCall

( Clarkson, 1984 ). Because of these characteristics of Ca, shoot deficiency symptoms appear primarily on the upper leaves. Visual symptoms include deformed, strap-like leaves; chlorosis; and leaves that develop yellow-to-tan margins, eventually becoming

Open access

Paul V. Nelson, Dean M. Krauskopf, and Nancy C. Mingis

Abstract

Symptoms for 7 nutrient deficiencies were established for elatior begonia ‘Schwabenland Red’ (Begonia X hiemalis Fotsch.). These are summarized in the form of a key as follows:

a. Chlorosis is a dominant symptom.

b. Chlorosis interveinal.

c. Interveinal chlorosis on older leaves followed by light tan necrotic spots within chlorotic areas which expand until leaf dies........................................................................................................................Mg

cc. Interveinal chlorosis on younger leaves.....................................................................................................Fe

bb. Chlorosis not interveinal.

c. Lower leaves uniformly yellow then purplish yellow and finally necrotic.................i.....................N

cc. Margins of canopy leaves yellow, then murky green-brown, and finally necrotic; all symptoms spread toward the leaf center......................................................................................................................Ca

aa. Chlorosis not a dominant symptom.

b. Necrosis begins along the margin of lower leaves and progresses inward....................................................K

bb. Plants stunted but normal green..........................................................................................................................P

bbb. Rust color, striations and cracks develop on young leaf petioles and peduncles perpendicular to their axes; internodes shortened and lateral shoots prolific; young leaves brittle crinkled around rust color spots which turn necrotic; chlorosis and necrosis spreading inward from the margin of young leaves...B

Open access

Mariano F. Galla, Bradley D. Hanson, and Kassim Al-Khatib

acetolactate synthase (ALS) inhibitor herbicide damage: leaf chlorosis, chlorotic spots, and internode shortening ( Al-Khatib, 2015 ). The effects of ALS inhibitor herbicides on off-target crops have been widely studied in annual and perennial crops ( Al

Free access

Jie Li, Scott M. Leisner, and Jonathan Frantz

, arabidopsis plants grown under elevated Cu conditions (30 μм) showed reduced growth and chlorosis starting at the tips of older leaves ( Fig. 1, A and B ). Occasionally, the older leaves became completely chlorotic. The plant chloroplast is particularly

Free access

Manuel G. Astacio and Marc W. van Iersel

), whereas the other half was watered as needed (well-watered) based on visual appearance of the substrate and measured ET. Visual observations of wilting, chlorosis, and lower leaf abscission were taken daily for the duration of the study, but these symptoms

Free access

Youping Sun, Guihong Bi, Genhua Niu, and Christina Perez

the chemical concentration. Foliar application of ethephon to ‘Sonora Jingle’ and ‘Sonora White’ poinsettia exhibited phytotoxicity as indicated by reduced biomass accumulation ( Sun et al., 2011 ). Leaf chlorosis appeared on seashore mallow plants

Open access

D. J. Styer and R. D. Durbin

Abstract

The reaction of 39 marigold cultivars to Pseudomonas syringae pv. tagetis Young, Dye & Wilkie was determined. Three new symptoms were observed in addition to large necrotic leaf spots with or without apical chlorosis: flecks and leaf spots both surrounded by chlorotic halos and apical chlorosis without leaf spots. Symptoms develop only on vegetatively growing tissue; new symptoms do not develop on mature tissue. Tall cultivars generally were more susceptible than dwarf cultivars.

Full access

Clint Hoffmann, Brad Fritz, Dan Martin, Ryan Atwood, Tim Hurner, Mark Ledebuhr, Matt Tandy, John L. Jackson, and Gail Wisler

The asian citrus psyllid is a detrimental pest to citrus crops when it serves as a vector of the pathogen that causes greening [huanglongbing (HLB)]. Transmission of this disease causes mottling, chlorosis, dieback, and reductions in fruit size and

Open access

Sangho Jeon, Charles S. Krasnow, Gemini D. Bhalsod, Blair R. Harlan, Mary K. Hausbeck, Steven I. Safferman, and Wei Zhang

lower case letters above columns indicate the significant difference in means at P < 0.05 by least significant difference test; 1 cm = 0.3937 inch, 1 g = 0.0353 oz. Chlorosis of young leaves was observed for plants in the AC filter treatment in both