caa a22 4500 397571682 CHVBK 20180308164843.0 cr unu---uuuuu 161202e19960201xx s 000 0 eng 10.1093/ee/25.1.174 doi (NATIONALLICENCE)oxford-10.1093/ee/25.1.174 Vertical Distribution in Soil, Persistence, and Efficacy Against Citrus Root Weevil (Coleoptera: Curculionidae) of Two Species of Entomogenous Nematodes (Rhabditida: Steinernematidae; Heterorhabditidae) [Elektronische Daten] [L. W. Duncan, C. W. McCoy] Experiments were conducted in a 6-yr-old citrus orchard to test the efficacy of different formulations of the nematodes Steinernema riobravis (Cabanillas,Poinar & Raulston) and Heterorhabditis baderiophora (Poinar) against a citrus root weevil, Diaprepes abbreviatus (L.), and to measure nematode persistence at different soil depths. One hour after application, >55% of both nematode species that were recovered in soil samples were at a depth of 0-1 cm and 33%of both species were recovered between depths of 3 and 15 cm. Numbers of S. riobravis at depths of 3-15 cm remained constant during the following 7 d, but numbers of H. bacteriophora declined 64%. During the same period, the numbers of both species recovered from depths of 0-1 cm declined by >99%. The data suggest that the lack of persistence reported for these nematodes in Florida citrus orchards is related to their vertical distribution in soil following application. Nine weeks after application, the numbers of D. abbreviatus at soil depths of 0-45 cm were reduced by 77 and 90%, respectively, in plots treated with liquid or granular formulations of S. riobravis. Neither formulation of H. bacteriophora affected the population density of D. abbreviatus. © 1996 Entomological Society of America Biological Control nationallicence Heterorhabditis bacteriophora nationallicence Steinernema riobravis nationallicence efficacy nationallicence persistence nationallicence spatial patterns nationallicence vertical distribution nationallicence Duncan L. W. University of Florida, IFAS, Citrus Research and Education Center, 700 Experiment Station Road, Lake Alfred, FL 33850 aut McCoy C. W. University of Florida, IFAS, Citrus Research and Education Center, 700 Experiment Station Road, Lake Alfred, FL 33850 aut Environmental Entomology Oxford University Press 25/1(1996-02-01), 174-178 0046-225X 25:1<174 1996 25 ee https://doi.org/10.1093/ee/25.1.174 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/ee/25.1.174 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Duncan L. W. University of Florida, IFAS, Citrus Research and Education Center, 700 Experiment Station Road, Lake Alfred, FL 33850 aut NATIONALLICENCE 700 1- McCoy C. W. University of Florida, IFAS, Citrus Research and Education Center, 700 Experiment Station Road, Lake Alfred, FL 33850 aut NATIONALLICENCE 773 0- Environmental Entomology Oxford University Press 25/1(1996-02-01), 174-178 0046-225X 25:1<174 1996 25 ee Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford