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Ryan J. Hayes, Mark A. Trent, Beiquan Mou, Ivan Simko, Samantha J. Gebben and Carolee T. Bull

select multiple lettuce types from a single resistant population. Development of these populations would rely on crossing parents that differ for resistance and leaf morphology. The high planting densities of baby leaf lettuce exacerbate the severity of

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Gang Lu, Wenlei Jian, Jiajing Zhang, Yijing Zhou and Jiashu Cao

disease severity and visually rated on a 1 to 5 scale: 1 = no symptoms or lesions; 2 = have some small noncoalesced lesions, presenting on 1% to 25% of stem; 3 = lesions present on 26% to 50% of stem, or coalesced lesions, no girdling; 4 = 51% to 75% of

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Ji Hae Jun, Jung Hyun Kwon, Eun Young Nam, Kyeong Ho Chung, Ik Koo Yun, Seok Kyu Yun, Yong Bum Kwack, Sung Jong Kim and Sang Jo Kang

‘Hahong’ is a new nectarine cultivar from the Rural Development Administration’s National Institute of Horticultural & Herbal Science breeding program, which has been in operation since 1962. ‘Hahong’ is a midseason nectarine that produces large

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Ariadna Monroy-Barbosa and Paul W. Bosland

( Biles et al., 1995 ). However, earlier published techniques for foliar blight screening produced confounded symptoms between the foliar blight and stem blight in the plant ( Fig. 1 ). The techniques reported lesions in all aerial parts as a symptom of

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Elena E. Lon Kan, Steven A. Sargent, Daniel J. Cantliffe, Adrian D. Berry and Nicole L. Shaw

1 = severe, serious surface shriveling, and/or decay. For each clamshell, percent marketable fruit was calculated by dividing the number of fruit rated ≥3 by the total number of fruit; the number of peppers showing shrivel, black lesions, or decay

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Beiquan Mou

Corky root of lettuce ( Lactuca sativa L.) has been found in major lettuce-producing regions of the world, including North America, Western Europe, Australia, and New Zealand. Roots of infected plants develop yellow to brown lesions that later

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Kathy Zuzek, David Zlesak, Vance Whitaker, Steve McNamara and Stan C. Hokanson

. In the field, small numbers of rose black spot lesions develop slowly at the base of plants through mid and late summer and only a slight-to-moderate amount of defoliation due to the disease is evident by mid-September (typical first frost

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Mohsen Mohseni-Moghadam, Christopher S. Cramer, Robert L. Steiner and Rebecca Creamer

yellow spot virus and thrips in onions, 2011 ). IYSV causes irregular or diamond-shaped straw-colored lesions that develop on leaves and seedstalks ( du Toit et al., 2004a ; Gent et al., 2004 ; Schwartz et al., 2002 ). If IYSV symptoms become severe

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David C. Zlesak, Vance M. Whitaker, Steve George and Stan C. Hokanson

, MI). Containers (subsequently referred to as boxes) were incubated in the laboratory at room temperature (21 to 24 °C). After the development of sporulating lesions in 10 to 14 d, the infected leaves were stored in sealed polyethylene bags at –20 °C

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Les D. Padley Jr, Eileen A. Kabelka, Pamela D. Roberts and Ronald French

-soaked lesions. Dieback of shoot tips, wilting, shoot rot, and plant death quickly follows initial infection. Fruit, which can be infected at any stage of maturity, may exhibit sunken, brown, water-soaked areas, which are rapidly covered by white sporangial