Louisiana State University Agricultural Center Research Articles

Bluetongue Virus in Sheep and Cattle and Culicoides variipennis and C. stellifer (Diptera: Ceratopogonidae) in Louisiana

The transmission of bluetongue virus (BLU) to sheep and cattle relative to Culicoides abundance and infection was studied in two areas of the Louisiana State University Agricultural Center, Baton Rouge, LA. The seroprevalence of BLU in beef cattle was 70.5% in 1989 and 37.0% in 1990; 2 of 37 animals tested in both years became positive, indicating active transmission. The prevalence of BLU in sheep decreased from 52.2% in 1989 to 34% in 1990; seroconversion was not detected. Serotypes of positive sheep were as follows: 13 sheep were positive for BLU-13, 6 for BLU-17, 2 for BLU-2, and 2 for both BLU-13 and BLU-17. The seroprevalence of BLU virus in dairy bulls increased from 15.4% in 1989 to 47.4% in 1990; 0 and 7 seroconversions occurred in 1989 and 1990, respectively. Serotypes of BLU from the bulls were as follows: five bulls for BLU-13; two for BLU-17; one for BLU-13 and BLU-17; and one for BLU-13, BLU-17, and BLU-2. Peaks in the abundance of Culicoides variipennis (Coquillett) and C. stellifer (Coquillett) collected in New Jersey light traps corresponded with the suspected transmission dates during 1990. Bluetongue viral RNA was detected in one of 381 pools (6,072 flies) of C. variipennis; no virus was detected in 125 pools (884 flies) of C. stellifer.

Citrus Red Mite Control on ‘4-40’ Satsuma Selection in Louisiana, 1991

Abstract The study was conducted on a plot of‘4-40’ satsuma mandarin trees located at the Louisiana State University Agricultural Center’s Citrus Research Station, Port Sulphur, LA. Pretreatment mite counts were made 11 Jun, and all treatments were applied 13 Jun with the aid of a FMC model 100 CP airblast sprayer and a tractor speed of 3rd low 1200 RPM to generate an operating pressure of approximately 200 psi. The study consisted of 5 treatments with 10 single tree replications from which mite counts were determined by taking 5 leaves per tree and counting the number of live mites on the right bottom half of the leaf and then doubling the count to obtain the number of mites per leaf. After treatment application mite counts were made at 7, 14, 30, 60, 90, and 120 DAT. All miticide spray solutions were buffered to a pH of approximately 6.0 with the addition of Triton AG-44 M (Latron AG-44 M).

Control of Citrus Red Mite on ‘Washington Navel’ Orange in Louisiana, 1991

Abstract The study was conducted on a plot of ‘Washington navel’ citrus trees located at the Louisiana State University Agricultural Center’s Citrus Research Station, Port Sulphur, Louisiana. Pre-spray mite counts were made 11 Jun, and treatments were applied 13 Jun with the aid of an FMC model 100 CP airblast sprayer with an operating pressure of approximately 200 psi and tractor speed of 3rd low 1200 RPM. The study consisted of 5 treatments with 10 single tree replications from which mite counts were determined by taking 5 leaves per tree and counting the number of live mites on the right bottom half of the leaf and then doubling the count to obtain the number of mites per leaf. Once treatment application had occurred, counts were taken at 7, 14, 30, 60, 90, and 120 DAT. When mite population built up to 10+ mites per leaf, that treatment(s) was reapplied. During this study, this occurred with the Kelthane treatment, which was reapplied 12 Jul and for both Morestan treatments which were reapplied 16 Aug. All miticide spray solutions were buffered to a pH of approximately 6.0 with the addition of Triton AG-44 M (Latron AG-44 M).

A New SAS Program for Calculating Stability– Variance Parameters

Journal Article A New SAS Program for Calculating Stability– Variance Parameters Get access M. S. Kang M. S. Kang Department of Agronomy, Louisiana State University Agricultural CenterBaton Rouge Address reprint requests to Dr. Kang, Associate Professor, Department of Agronomy, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge, LA 70803-2110 Search for other works by this author on: Oxford Academic PubMed Google Scholar Journal of Heredity, Volume 80, Issue 5, September 1989, Page 415, https://doi.org/10.1093/oxfordjournals.jhered.a110889 Published: 01 September 1989

Alfalfa Weevil Control, 1988

Abstract Alfalfa Weevil Control, 1988: Nonirrigated alfalfa, 10 inches tall, was sprayed 14 Apr. Insecticides were applied in water (20 gal/acre) with I a CO2-powered backpack sprayer. The sprayer boom was equipped with 70° hollow-cone nozzles positioned to deliver a broadcast spray pattern. Mean wind speed was 7 mph. A randomized complete block design with 4 replicates was used. Plots measured 20 by 20 ft with unsprayed alleys separating adjacent plots. Eight stems were collected from undisturbed areas within each plot on each sample date. Samples from each plot were individually bagged, returned [ to the laboratory, and frozen. Samples were later thawed and examined under magnification for AW larvae. Pretreatment counts were taken and sampling I was repeated at 1, 4, 6, 8, 11, 15, and 21 DAT. J. B. Graves, A. M. Pavloff, and B. E. Leonard Department of Entomology Louisiana Agricultural Experiment Station Louisiana State University Agricultural Center Baton Rouge, LA 70803 (504) 388-1634

A perspective on equine infectious anemia with an emphasis on vector transmission and genetic analysis

CHARLES J. ISSEL1s4, KEITH RUSHLOW’, LANE D. FOIL’ and RONALD C. MONTELAR03 Departments of 'Veterinary Science, ‘Entomology and 3Biochemistry, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Louisiana State University, Baton Rouge, LA 70803 (U.S.A.) 4Department of Veterinary Microbiology and Parasitology, Louisiana State University School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803 (U.S.A.) 5Battelle Memorial Institute, 505 King Avenue, Columbus, OH (U.S.A.)

Conformity and incongruity of selected dispersion indices in describing the spatial distribution of Trichoplusia ni (Hübner) in geographically separate cabbage plantings

Population EcologyVolume 29, Issue 2 p. 155-166 Article Conformity and incongruity of selected dispersion indices in describing the spatial distribution of Trichoplusia ni (Hübner) in geographically separate cabbage plantings J. T. Trumble, J. T. Trumble Department of Entomology, University of California, 92521 Riverside, CA, USASearch for more papers by this authorJ. V. Edelson, J. V. Edelson Department of Entomology, University of California, 92521 Riverside, CA, USA Texas Agricultural Experiment Station, 78956 Weslaco, TXSearch for more papers by this authorR. N. Story, R. N. Story Department of Entomology, University of California, 92521 Riverside, CA, USA Department of Entomology, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, 70803 Baton Rouge, LASearch for more papers by this author J. T. Trumble, J. T. Trumble Department of Entomology, University of California, 92521 Riverside, CA, USASearch for more papers by this authorJ. V. Edelson, J. V. Edelson Department of Entomology, University of California, 92521 Riverside, CA, USA Texas Agricultural Experiment Station, 78956 Weslaco, TXSearch for more papers by this authorR. N. Story, R. N. Story Department of Entomology, University of California, 92521 Riverside, CA, USA Department of Entomology, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, 70803 Baton Rouge, LASearch for more papers by this author First published: December 1987 https://doi.org/10.1007/BF02538881Citations: 5AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Citing Literature Volume29, Issue2December 1987Pages 155-166 RelatedInformation