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Jack E. McCoy and Paul W. Bosland

significance with New Mexico having the largest area of chile pepper production in the United States ( USDA, 2017 ). A relatively new disease affecting chile pepper production in New Mexico is powdery mildew incited by L. taurica (Lév.) Arn. Powdery mildew is

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Stephen N. Wegulo and Miguel Vilchez

wholesale value of larkspur ( Delphinium spp. and Consolida spp.) as a cut flower in the United States for operations with sales worth $100,000 or more was $8 million, with California accounting for 80% of those sales ( Jerardo, 2007 ). Powdery mildew is

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Mark J. Henning, Henry M. Munger, and Molly M. Jahn

`PMR Delicious 51' is a new and improved version of the `Delicious 51' eastern type melon (Cucumis melo L.). It was developed in the Department of Plant Breeding at the Cornell University Agricultural Experiment Station in Ithaca, N.Y. It is well adapted for northeastern U.S. conditions and shows potential for good adaptation in the northwest. It is well suited for home gardeners, market gardeners, and commercial growers who want to grow an open-pollinated (OP) melon. `PMR Delicious 51' has excellent resistance to powdery mildew races 1 and 2 (Podosphaera xanthi) and resistance to fusarium wilt (Fusarium oxysporum f. sp. melonis) race 2.

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Chandrasekar S. Kousik, Jennifer L. Ikerd, Mihir K. Mandal, Scott Adkins, Craig G. Webster, and William W. Turechek

USVL351-PMR (powdery mildew resistant) and USVL482-PMR are bottle gourd ( Lagenaria siceraria ) germplasm lines that exhibit high levels of resistance to the cucurbit powdery mildew (PM) pathogen ( Podosphaera xanthii ) compared with susceptible

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Narinder P.S. Dhillon, Supannika Sanguansil, Supornpun Srimat, Suwannee Laenoi, Roland Schafleitner, Michel Pitrat, and James D. McCreight

economically and nutritionally important crop that is mainly cultivated by smallholder farmers in Asia, where it is grown on ≈340,000 ha (Arvind Kapur, Acsen HyVeg Private Limited, personal communication). Powdery mildew infection of BG can lead to diminished

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Chandrasekar S. Kousik, Amnon Levi, Kai-Shu Ling, and W. Patrick Wechter

adaptation of grafted plants to the local environment, resistance to prevailing diseases, and the appropriate rootstock–scion combination ( Cohen et al., 2007 ; Yetisir and Sari, 2003 ). Powdery mildew caused by Podosphaera xanthii (Castagne) Braun

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Fulya Baysal-Gurel and Ravi Bika

persistent ornamental shrub; however, it can be severely affected by powdery mildew caused by Podosphaera physocarpi ( Baysal-Gurel et al., 2020 ; Zlesak, 2012 ). The fungus is highly specialized and forms a close association with ninebark, and a condition

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Christian A. Wyenandt, Nancy Maxwell, and Daniel L. Ward

Jersey, pumpkin crops play a critical role in keeping small roadside farm markets operational during fall months through agritourism events such as fall festivals, grade school farm tours, and u-pick operations. Powdery mildew [ Podosphaera (sect

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Haiying Zhang, Shaogui Guo, Guoyi Gong, Yi Ren, Angela R. Davis, and Yong Xu

powdery mildew. The accessions represent three species, C . lanatus var. lanatus (766), C . lanatus var. citroides (L. H. Bailey) Mansf. (53), and C . colocynthis (L.) Schrad. (1). Thirty lines demonstrated resistance; the most notable

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Yuan Li, Arend-Jan Both, Christian A. Wyenandt, Edward F. Durner, and Joseph R. Heckman

problems associated with pumpkin is the risk of premature defoliation caused by foliar diseases such as powdery mildew. Podosphaera xanthii (formerly Sphaerotheca fuliginea ) and Erysiphe cichoracearum are the two reported fungal species that can cause