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Open access

Brent Harbaugh

Abstract

Visual symptoms of N, P, K, Ca, Mg, Mn, Fe and B deficiencies were induced in Caladium × hortulanum Birdsey ‘Candidum’. Characteristic symptoms were photographed and described and a key summarizing these symptoms follows:

a. Chlorosis or necrosis not expressed;

b. Petioles brittle and/or leaves orbicular.........................................................................................................................B

bb. Plants grow slowly, but have no other symptoms......................................................................................................P

bbb. Rust colored spots on underside of leaf near petiole, spots may become “windows” (only the cuticle and epidermal layer remain)................................................................................................................................................. Ca

aa. Chlorosis and/or necrosis expressed;

b. Chlorosis primary symptom.

c. Interveinal and veinal chlorosis

d. Chlorosis evident as leaves unfurl............................................................................................................... Mn

dd. Chlorosis not evident as leaves unfurl, older leaf blades and veins may turn bright yellow as they abscise................................................................................................................................................................... N

cc. Interveinal chlorosis...................................................................................................................................................Fe

bb. Both chlorosis and necrosis expressed.

c. Interveinal chlorosis developing into necrotic spots, leaves turn bright yellow (except basal veins remain green) as they abscise............................................................................................................................................. Mg

cc. Necrotic specks (@ 1 mm) near veins, general chlorosis............................................................................... Mn

bbb. Necrosis primary symptom.

c. Necrotic lesions (2–5 cm) on leaf apex and distal m argin.................................................................................K

cc. Marginal necrosis.

d. Necrosis spreads toward the center of the leaf, margins dry but the leaf blade around petiole remains intact.......................................................................................................................................................................K

dd. Interveinal rust colored, blotchy areas.........................................................................................................Ca

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Monica Ozores-Hampton

interveinal chlorosis with a yellowing of the leaf tissue in the interveinal region while the veins remain green. Due to poor mobility within the plant, Fe deficiency symptoms are common in the youngest leaves first, especially at the base of the leaves. Under

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Diane Feliciano Cayanan, Youbin Zheng, Ping Zhang, Tom Graham, Mike Dixon, Calvin Chong, and Jennifer Llewellyn

in water. Henceforth, free residual chlorine is referred to as free chlorine. Use of chlorine in excess can cause visual injury, including chlorosis (bleaching action of tissues), necrotic mottling (red and black dark spots on the leaf surface

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Nichole F. Edelman, Bethany A. Kaufman, and Michelle L. Jones

-induced petal senescence, flower abscission, epinasty, leaf chlorosis, and leaf abscission make crops unmarketable and increase postproduction shrink ( Jones and Edelman, 2013 ; Jones and Ling, 2012 ). Researchers have investigated the ethylene responsiveness

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Shinsuke Agehara

during the transport and transplanting of seedlings ( Vavrina, 2002 ). Seedlings are also subjected to abiotic stress after transplanting, such as direct sunlight, wind, and temperature extremes. Common symptoms of transplant shock include leaf chlorosis

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Jayesh B. Samtani, John B. Masiunas, and James E. Appleby

crinkling and malformed growth to some collard and kale cultivars ( Harrison et al., 1998 ). Simulated glyphosate drift on pepper ( Capsicum annuum L.) caused chlorotic terminal buds and later chlorosis of the foliage developing from the buds ( Gilreath

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T. C. Keisling and M. C. Fuqua

Abstract

A field survey in 1977 and greenhouse studies revealed that chlorosis and stunting in rose (Rosa hybrida L. cv. Summer Snow) budded on Rosa multiflora Thumb. root-stock was due to Mn and A1 toxicity on soils with pH 5.0 or below. Liming reduced Mn and A1 tissue concentrations, promoted root growth, and alleviated chlorosis.

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Adam D. Call, Todd C. Wehner, Gerald J. Holmes, and Peter S. Ojiambo

. Disease severity was evaluated weekly as chlorotic and necrotic lesions and degree of stunting. Chlorosis and necrosis were rated on a 0 to 9 scale based on percentage of symptomatic leaf area (0 = 0%, 1 = 1% to 3%, 2 = 3% to 6%, 3 = 6% to 12%, 4 = 12% to

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Ute Albrecht and Kim D. Bowman

% of all leaves symptomatic, 4 = 50% to 75% of all leaves symptomatic, and 5 = more than 75% of all leaves symptomatic. Leaf symptoms included yellowing, blotchy mottle, and reduced size combined with severe chlorosis at advanced stages of the disease

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William S. Castle, James Nunnallee, and John A. Manthey

chlorosis suggested that the selections fell into several categories based on a composite of the three variables that improved the ranking procedure. Two questions remaining after our first efforts were: 1) could the procedure be miniaturized so that