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T. Scott Starr and L. F. Thompson

Interveinal chlorosis has been observed on the oldest leaves of several varieties of flowering crabapple (Malus sargentii Rehl). Our objective was to identify the cause of this disorder. Foliage and soil from 20 Sargent crabapple trees growing on 12 different sites were analyzed for possible nutrient deficiencies or excesses. Analyses showed N to be slightly low, Ca high, and Mg low in all leaf samples. Soil analysis showed Ca to be abnormally high at all sites. We concluded that the leaf discoloration was caused by a Mg deficiency due to Ca suppression of the Mg and that the low foliar N might be a contributing factor in the interveinal chlorosis.

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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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W. Garrett Owen

solution pH and thus limited nutrient availability and uptake. By 8 WAT, all cultivars grown in substrates incorporated with DL+HL exhibited chlorosis (yellowing) and interveinal chlorosis, which is speculated to be high pH–induced Fe deficiency ( Fig. 4

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Christopher Parry and Bruce Bugbee

leaching significantly increased interveinal chlorosis likely due to elevated P in the root-zone and possible leaching of the siderophores from the rhizosphere. These results suggest that reducing excess root-zone P in greenhouse irrigation solutions can

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

+ width 1 + width 2)/3. Phytotoxicity symptoms, reflected as curled leaves, and/or interveinal chlorosis, or bleaching of new growth were evaluated 2 weeks (i.e., 26 July) and 6 weeks after dikegulac sodium application on a 0 to 10 visual scale; 0

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Lina Fu, Lijun Chai, Dekuan Ding, Zhiyong Pan, and Shu’ang Peng

rootstock showed obvious interveinal chlorosis in young leaves ( Fig. 1C ). This is a common symptom of Fe-deficiency chlorosis, so the basic soil properties were measured to confirm our speculation. Soil pH and the concentration of Ca were much higher than

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Mary Jane Clark and Youbin Zheng

. Symbol omission for the conventional fertilization method at 16.0 g/pot N on 19 July 2016 is a result of the lack of plant survival. Visual observations of leaf color for the C fertilizer method detected interveinal chlorosis for more plants at 16.0 g

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Youbin Zheng, Diane Feliciano Cayanan, and Mike Dixon

replications (30 subsamples). Points for the same day bearing the same letter (beside the symbol) indicate that the means are not significantly different at the P ≤ 0.05 level. During the last week of the experiment, there was interveinal chlorosis on

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Richard J. Heerema, Dawn VanLeeuwen, Marisa Y. Thompson, Joshua D. Sherman, Mary J. Comeau, and James L. Walworth

every measurement date during the three seasons of the study ( Fig. 4 ). The soil Zn treatment by date interaction for SPAD was significant in 2014, but was not significant in 2013. Low leaf SPAD in the Control indicated the onset of interveinal

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Douglas A. Cox

Six cultivars of poinsettia (Euphorbia pulcherrima Willd. ex Kl.) were grown in unlimed growth medium consisting of equal volumes of sphagnum peat and perlite. Plants received fertilizer solutions supplying Mo at either 0.0 mg·liter-1 (-Mo) or 1.0 mg·liter -1 (+Mo). In the –Mo treatment, moderate to severe symptoms of Mo deficiency (marginal and interveinal chlorosis, marginal necrosis, and downward curling of the margins) developed on the middle-aged and some recently matured leaves of `Annette Hegg Brilliant Diamond' and `Eckespoint Lilo', while some interveinal chlorosis occurred on the same leaves of `Gutbier V-17 Angelika'. No symptoms appeared on `Gross Supjibi', `Peace Regal Velvet', and `Peace Noel'. All cultivars were symptomless in the + Mo treatment. In the –Mo treatment, upper, recently matured leaves of the symptomatic cultivars and two of three symptomless cultivars had Mo concentrations at or near the critical level for deficiency; however, nitrate reductase enzyme activity was higher and NO3-N was lower in the leaves of symptomless cultivars than of symptomatic cultivars.