David T. Kaplan

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Chromosome numbers were determined in seventeen populations of Radopholus similis from widely separated geographic regions of the world, viz. Honduras, Costa Rica, Panama, Mexico, Ecuador, Guatemala, Hawaii (U.S.A.), Indonesia and Florida (U.S.A.). Al1 specimens examined had haploid chromosome numbers of either n = 4 or n = 5, the same numbers found,(More)
Coleoscirus simplex (Ewing) · (Cunaxidae: Coleoscirinae) colonizes greenhouse pot cultures of rootknot nematodes (Meloidogyne spp.) in Orlando, Florida, where it preys on vermiform nematodes and soil arthropods. This is the first report of nematophagy in a cunaxid mite. Mating was required for oviposition inC. simplex. An average of 4.4 eggs were laid per(More)
Rough lemon seedlings were grown in mycorrhizal-infested or phosphorus-amended soil (25 and 300 mg P/kg) in greenhouse experiments. Plants Were inoculated with the citrus burrowing nematode, Radopholus citrophilus (0, 50, 100, or 200 nematodes per pot). Six months later, mycorrhizal plants and nonmycorrhizal, high-P plants had larger shoot and root weights(More)
Monoxenic cultures of burrowing nematode populations extracted from banana roots from Belize, Guatemala, Honduras, and Costa Rica were established on carrot discs. Cultures of Radopholus spp. were also obtained from Florida, Puerto Rico, Dominican Republic, and Ivory Coast. The aggressiveness (defined as reproductive fitness and root necrosis) of these(More)
Karyotype, gametogenesis, and gonad morphology were characterized for 56 Radopholus spp. isolates collected from Africa, Australia, Central America, Cuba, Dominican Republic, Guadeloupe, Puerto Rico, North America (Florida), and Hawaii. Seven of the isolates, all collected from Florida, were citrus-parasitic. The haploid karyotype for all isolates was n =(More)
Fluorescent conjugates of the lectins soybean agglutinin (SBA), Concanavalin A (Con A), wheat germ agglutinin (WGA), Lotus tetragonolobus agglutinin (LOT), and Limulus polyphemus agglutinin (LPA) bound primarily to amphidial openings and amphidial secretions of viable, preinfective second-stage juveniles (J2) of Meloidogyne incognita races 1 and 3 (Mil,(More)
Treatment of second-stage juveniles (J2) of Meloidogyne incognita race 1 and M. javanica with soybean agglutinin, Concanavalin A, wheat germ agglutinin, Lotus tetragonolobus agglutinin, or Limax flavus agglutinin or the corresponding competitive sugars for each of these lectins did not alter normal root tissue response of soybean cultivars Centennial and(More)
Parasitism by Trophotylenchulus floridensis Raski, 1957 was studied on roots of sand pine (Pinus clausa [Chapm.] Vasey). Different life stages of the nematode were observed to be covered by dark, spherical, brittle, capsule-like structures which protruded from the root surface. The mature capsule enveloped a single sedentary female with a gelatinous matrix(More)
Incubation of Arthrobotrys dactyloides conidia in the presence of Radopholus citrophilus in lectin solutions with their corresponding sugars did not alter the stimulation of trap formation in solutions containing lectins alone. The lack of inhibition of lectin-stimulated trap formation by sugars or by lectin denaturation and the lack of lectin specificity(More)