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Rachel P. Naegele

Botrytis cinerea is a generalist nectrophic fungus capable of infecting more than 200 species of plants ( Droby and Lichter, 2007 ). In Vitis spp., B. cinerea can incite bunch rot, also known as gray mold, in addition to cane and leaf spot

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Timothy W. Coolong, Ronald R. Walcott and William M. Randle

years ( Tietjen and Ceponis, 1981 ; Williams-Woodward, 2001 ). Five Botrytis species have been linked to neck rot in onion ( Yohalem et al., 2003 ). Three species, however, are considered exclusively associated with symptoms of neck rot in onion

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Yuee Tian, Zhiping Che, Di Sun, Yuanyuan Yang, Xiaomin Lin, Shengming Liu, Xiaoyu Liu and Jie Gao

present, more than 20 kinds of fungal diseases of peony have been reported, of which gray mold caused by Botrytis cinerea is an increasingly severe disease with a high frequency of occurrence ( Yang et al., 2017 ). The pathogen can cause necrotic leaves

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Kimberly H. Krahl and William M. Randle

Botrytis diseases are the most common and among the most destructive diseases affecting greenhouse-grown crops. Presently a combination of cultural control and fungicidal sprays are used to control the disease. Increasing energy and labor costs plus evidence of resistance of B. cinerea strains to commonly used fungicides has made the disease more difficult to control. A source of genetic resistance would provide an additional powerful and stable tool to control the incidence of Botrytis disease.

In this study screening techniques for Botrytis resistance in petunia were developed and 40 petunia genotypes were screened for resistance to B. cinerea. A wide range of variability for resistance to B. cinerea was discovered in petunia. Results indicate the presence of useful quantitative-type resistance to B. cinerea in petunia.

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Julia M. Harshman, Wayne M. Jurick II, Kim S. Lewers, Shiow Y. Wang and Christopher S. Walsh

Raspberries ( Rubus sp.) are the third most popular berry in the United States ( Geisler, 2012 ) and a growing specialty crop for both the wholesale industry and smaller, local markets, and U-pick. Postharvest susceptibility to gray mold ( Botrytis

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Kimberly H. Krahl and William M. Randle

Although Petunia hybrida Vilm., a major bedding plant, is susceptible to many diseases, no formal disease resistance studies have been conducted. Botrytis cinerea Pers. ex Fr. is a ubiquitous pathogen, causing great damage to greenhouse-grown ornamental crops, including petunia. In this study, a screening procedure for B. cinerea resistance in petunia was developed and 48 diverse petunia phenotypes were screened for resistance to B. cinerea in two seasons, spring and fall. The range of variability for resistance to B. cinerea in petunia was wide and continuous. Spearman's rank correlation coefficients between seasons were significant and moderate. While the majority of phenotypes displayed less than a 10% difference in mean percent infection in spring vs. fall seasons, several phenotypes displayed large differences that require further testing. One cultivar, `Pink Sensation Improved', exhibited low and consistent mean percent infection in both spring and fall and, therefore, may be a useful source of resistance to B. cinerea in petunia.

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Guangxin Liu, Xiaoqian Su, Lingling Guan and Fengrong Hu

, and edible values, and they are one of the most important cut flowers worldwide ( Mollaei et al., 2018 ). With the continuous expansion of lily cultivation, lily disease is becoming increasingly serious; furthermore, leaf blight ( Botrytis elliptica

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Michael S. Uchneat and Richard Craig

Botrytis cinerea is an economically important fungal pathogen of Pelargonium species. We are currently studying this plant–pathogen interaction to identify mechanisms of host resistance. Our ultimate objective is to develop commercial Pelargonium genotypes with enhanced resistance to this pathogen. Though all stages of production may be affected by this pathogen, we are investigating foliar and floral resistance of mature plants. Through simple assays, over 200 genotypes have been evaluated for foliar resistance, and more than 100 genotypes have been evaluated for floral resistance. Resistant and susceptible control genotypes have been identified for diploid and tetraploid P. ×hortorum and P. peltatum; these genotypes are being investigated to elucidate mechanisms of resistance. The diploid ivy accession 86-23-1 and the tetraploid zonal geranium `Fox' have the greatest foliar resistance among the genotypes evaluated. The diploid P. ×hortorum `Ben Franklin' has the greatest floral resistance among the evaluated genotypes. Foliar and floral resistance appear to be inherited as separate traits. Foliar resistance is manifested as a two day delay in symptom expression when compared to susceptible genotypes. Foliar resistant accession 86-23-1 has a cuticle with 150% the mass of other Pelargonium genotypes. This difference may be responsible for the observed resistance. Cuticle mass does not appear to be important in floral resistance.

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Dharmalingam S. Pitchay, Jonathan M. Frantz, James C. Locke, Charles R. Krause and George C. J. Fernandez

disease in plants ( Mengel and Kirby, 2001 ; Talbot and Zeiger, 1996 ). These confounding findings could be a potential factor for conflicting reports of the influence of N in disease-related studies. Botrytis cinerea is a ubiquitous pathogen that

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Judith Pozo, Miguel Urrestarazu, Isidro Morales, Jessica Sánchez, Milagrosa Santos, Fernando Dianez and Juan E. Álvaro

extent of the damage caused by the penetration of the pathogen. ( A ) Leaf discs from pepper plants subjected to the four different treatments 3 d after inoculation (DAI); 1) with silicon (Si) and Botrytis cinerea inoculum (+Si +Bot .); 2) without Si