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Jeremy Burdon, David Billing, and Paul Pidakala

were removed and discarded, and the four pieces of fruit flesh were sliced into ≈1 mm discs, dried at 65 °C for 24 h, and then reweighed. The dry matter is expressed as the percentage mass remaining after 24 h of drying. Fruit quality (rots and

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Rachel P. Naegele and Mary K. Hausbeck

., 2012b ; Parada-Rojas and Quesada-Ocampo, 2019 ). Host resistance to diverse isolates of P. capsici is an important management tactic and a focus for pepper ( Capsicum annuum ) breeding programs globally. In pepper, the pathogen can cause root rot

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Parama Sikdar, Mike Willett, and Mark Mazzola

speck rot and Sphaeropsis rot of apple, respectively, are two postharvest fungal pathogens recently determined to be of concern to the Washington apple industry ( Kim and Xiao, 2006 ; Kim et al., 2013 , 2014 ; Sikdar et al., 2014 ; Xiao et al., 2004

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Charles S. Krasnow, Rachel P. Naegele, and Mary K. Hausbeck

, pumpkins, and cucumbers in the United States with more than 68,500 acres of vegetable crops susceptible to P. capsici grown annually ( Anonymous, 2013 ). In the midwest and eastern United States, P. capsici commonly causes a fruit rot on cucurbits and

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Jennifer Johnson-Cicalese, James J. Polashock, Josh A. Honig, Jennifer Vaiciunas, Daniel L. Ward, and Nicholi Vorsa

the industry is fruit rot. Cranberry fruit rot is caused by a complex of fungi from at least 12 genera ( Oudemans et al., 1998 ). In New Jersey, 25% fruit loss is common, even with multiple, carefully timed fungicide applications beginning during mid

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Vincent Njung’e Michael, Yuqing Fu, and Geoffrey Meru

causal agent of foliar blight, root rot, fruit rot, and crown rot disease syndromes in cucurbits ( Babadoost, 2016 ). Phytophthora crown rot is particularly prevalent in fields prone to flooding, often resulting in total crop loss. Consequently, current

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Rick D. Peters, Tharcisse Barasubiye, and Joanne Driscoll

particularly susceptible to bruising, especially during mechanical harvesting, which can lead to the development of rot in storage. For this reason, much of the crop in some production areas, including Prince Edward Island, is hand-harvested. During the

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John R. Yeo, Jerry E. Weiland, Dan M. Sullivan, and David R. Bryla

Phytophthora cinnamomi is a highly virulent root rot pathogen of highbush blueberry and is present in most growing regions worldwide ( Strik and Yarborough, 2005 ; Zentmyer, 1980 ). Symptoms of infection include poor shoot growth, root necrosis

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Chrislyn Ann Particka and James F. Hancock

Black root rot (BRR) is a widespread disease of strawberry that causes the death of feeder roots and the degradation of structural roots resulting in an overall decrease in productivity ( Maas, 1998 ). By the 1950s, BRR had been reported in many

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S.L. Krebs

Root rot caused by the soil-borne pathogen Phytophthora cinnamomi is one of the deadliest and most costly diseases in rhododendron culture. Unfortunately, the majority of cultivars appear to be susceptible to this fungus. Host resistance does occur, but it represents a tolerance of rather than immunity from the disease. A breeding program has been initiated to develop a broader array of root rot resistant cultivars and to determine the genetic basis for resistance. Greenhouse inoculations and screenings of 48 contemporary cultivars yielded seven clones with moderate to high levels of resistance to P. cinnamomi. Protocols for evaluation at the seedling stage were developed in order to screen large breeding populations of about 200 seedlings per cross. Root rot tolerance appears to have low-moderate heritability in these rhododendron populations. Groups of progeny with one resistant parent had a slower mortality rate and higher survivorship (avg. 10%) after 2 months of disease pressure than crosses in which both parents were susceptible (0 survivorship). A recurrent selection strategy is planned to increase the frequency of alleles for resistance in breeding populations of rhododendrons.