Publications by authors named "Fogle D"

The genus Scilla (Hyacinthaceae) includes more than 50 species of perennial, flowering bulbs grown in landscapes worldwide. In December 2000 and May 2009, an unknown leaf spot disease on Scilla peruviana was submitted to the California Department of Food and Agriculture Plant Pest Diagnostic Lab. Samples were collected during routine phytosanitary inspections of production fields in Santa Cruz County in 2000 and Monterey County in 2009.

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Beginning in 2000 and continuing into 2004, a previously undescribed disease caused significant damage to romaine lettuce (Lactuca sativa) in the coastal Salinas Valley of California. Symptoms were brownish black, sunken cavities on the crown and upper taproot. Cavities were firm, lacked signs of fungal growth, and resulted in cracking and weakening of the crown.

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Ramularia leaf spot was identified in several fields of safflower (Carthamus tinctorius) near Gridley, CA in June 2005. Numerous circular to irregularly shaped brown lesions, 3 to 10 mm in diameter, on both sides of leaves and flower bracts resulted in stunted plants and reduced seed production. In two of the fields, nearly all plants were affected, yields were severely reduced, and the crops were abandoned.

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In California, marguerite daisy (Argyranthemum frutescens [= Chyrsanthemum frutescens]) is an important, commercially grown, perennial flowering plant that is used as a potted plant, cutflower, and landscape plant. For two seasons (2003 and 2004), a downy mildew disease has been affecting marguerite daisy at wholesale container and field cutflower nurseries and retail nurseries in coastal California (Monterey, Santa Cruz, and San Mateo counties). The disease occurred early in the season (January) and continued to infect new foliage throughout the year whenever cool, foggy weather occurred.

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In November 2002, a disease was observed on eight cultivars of Asiatic hybrid lilies (Lilium sp.) in two fields in Carpinteria, CA. The same disease was observed on greenhouse grown Asiatic hybrid lilies in Nipomo, CA in an adjacent county.

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A grapevine decline of unknown etiology is currently under investigation in California. Two- to 5-year-old vines show low vigor with undersized trunks, short internodes, uneven wood maturity, sparse foliage, and stunted, chlorotic leaves with interveinal chlorosis and necrosis. Trunks viewed in cross section show dark streaking in few to most of the vascular elements.

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Black-foot disease, caused by Cylindrocarpon obtusisporum (Cook & Harkn.) Wollenweb., impacts young table and wine grape (Vitis vinifera) plantings throughout California.

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We studied first-order root development of field-grown plants of 44 F(1) Populus trichocarpa x P. deltoides hybrids as well as 15 clones of P. trichocarpa (T) and 20 clones of P.

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Intact viable 13762 mammary-adenocarcinoma ascites cells hydrolyse added ATP. The localization of hydrolysis product and inactivation by the slowly penetrating chemical reagent diazotized sulphanilic acid indicate that this ATPase is at the external surface of the cell. A number of features differentiate this enzyme from mitochondrial, myosin and cation-transport ATPases.

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Lectin inactivation of the cell surface enzyme 5'-nucleotidase has been studied in intact 13762 mammary ascites cells, cell membrane envelopes, membrane vesicles, and solubilized membranes as a means of understanding the effects of lectins on biochemical processes and the behavior of the enzyme in the membranes. The properties of the enzyme are essentially the same in the intact cells and in membrane envelopes prepared after zinc treatment of the cells. The enzyme has a Km of 25 muM and is inhibited by concanavalin A (Con A) by an apparent noncompetitive process, which is reversed by alpha-methylmannoside.

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