L R Krusberg

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Peach [Prunus persica (L.) Batsch] regenerants from cv ‘Sunhigh’ embryo no. 156, regenerants obtained from cv ‘Redhaven’ embryo no. 30, and two peach cultivars ‘Sunhigh’ and ‘Redhaven’, were screened for polymorphic RAPD (Random Amplified Polymorphic DNA) markers with up to 60 10-mer primers. Although 35 primers produced results with scoreable bands, only(More)
Plant and soil nematodes significandy impact our lives. Therefore, we must understand and manage these complex organisms so that we may continue to develop and sustain our food production systems, our natural resources, our environment, and our quality of life. This publication looks specifically at soil and plant nematology. First, the societal impact of(More)
Development of the corn cyst nematode, Heterodera zeae, was studied in growth chambers at 20, 25, 29, 33, and 36 +/- 1 C on Zea mays cv. Pioneer 3184. The optimum temperature for reproduction appeared to be 33 C, at which the life cycle, from second-stage juvenile (J2) to J2, was completed in 15-18 days; at 36 C, 19-20 days were required. Juveniles emerged(More)
Red pines Pinus resinosa in Garrett and Allegany counties, Maryland, were examined during 1982-84 to determine distribution of the pinewood nematode, Bursaphelenchus xylophilus, within and among trees. Approximately 25-year-old (younger) and 47-year-old (older) trees were subdivided into the following categories: 1) trees with mostly green needles; 2) trees(More)
The host range of the corn cyst nematode, Heterodera zeae, recently detected in Maryland, was investigated. A total of 269 plant entries, representing 68 families, 172 genera, and 204 species, was inoculated with cysts or a mixture of eggs and second-stage juveniles of H. zeae. The host range of the Maryland population of H. zeae was limited to plants of(More)
Several factors were studied to determine their effects on hatch and emergence of second-stage juveniles (J2) from cysts of Heterodera zeae. The optimum temperature for emergence of J2 from cysts of H. zeae was 30 C. No juveniles emerged from cysts at 10 or 40 C. Immersion of cysts in 4 mM zinc chloride solution stimulated 10% greater emergence of J2 than(More)
Soluble protein, esterase and oxidative enzyme patterns of the Waynesville, North Carolina, (WNC) and Raleigh, North Carolina, (RNC) populations of Ditylenchus dipsaci were compared. Polyacrylamide gel electrophoretic patterns of soluble protein extracts of nematodes of the two populations differed. Esterase and catalase patterns, however, were identical.(More)