scholarly journals Control of Whiteflies with Imidacloprid on Fall Cantaloupes, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 104-104 ◽  
Author(s):  
J. C. Palumbo ◽  
C. H. Mullis ◽  
F. J. Reyes
Keyword(s):  
Seed Treatment ◽  
F Test ◽  
Local Practices ◽  
University Of Arizona ◽  
Direct Seeded ◽  
The University

Abstract Cantaloupes were direct seeded on 23 Aug into beds spaced 80 inches apart at the University of Arizona, Yuma Valley Agricultural Center, Yuma, AZ. Plots consisted of 4 beds, 50 ft long with a 20 ft buffer between plots. Plot preparation and seasonal maintenance followed local practices. Plots were arranged in a RCB design with 4 replicates. Admire 2F treatments were applied 2 in. sub-seed furrow by injecting the material into the beds with long, narrow shanks in 20 GPA total volume of water before seeding. The Gaucho seed treatment was formulated at a rate of 35 g AI of imidacloprid/kg of cantaloupe seed. Foliar applications were made with a tractor drawn sprayer that delivered 48 gpa at 320 psi. The Capture+Thiodan mixture was applied on 8, 12, 20, and 27 Sep. Provado and Pyriproifen were applied on 8, 12, 20, 27 Sep and 7, 16 Oct. SPWF densities were estimated by counting the number of eggs and nymphs on two-cm2 disk sections taken from each of 20 leaves per plot on 7 Sep, 28 Sep and 2 Nov. Because of heterogeneity of mean variances, insect data was transformed (log10 x + 1) prior to analysis. Treatment differences among means were estimated with the Ryan-Einot-Gabriel-Welsch multiple F test.

scholarly journals Efficacy of Pyrethroid & Endosulfan Combinations Against Whitefly Adults on Spring Cantaloupes, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 103-104
Author(s):  
J. C. Palumbo ◽  
C. H. Mullis
Keyword(s):  
Analysis Of Variance ◽  
Furrow Irrigation ◽  
F Test ◽  
Local Practices ◽  
University Of Arizona ◽  
Direct Seeded ◽  
The University

Abstract Cantaloupes were direct seeded on 9 Mar into pre-irrigated beds spaced 80 inches apart at the University of Arizona, Yuma Valley Agricultural Center, Yuma, AZ. Plots consisted of 4 beds, 60 ft long with a 13 ft buffer between plots. Plot preparation and seasonal maintenance followed local practices. Plots were established and insecticide incorporated with furrow irrigation. Plots were arranged in a RCB design with 4 replicates. Foliar applications were made with a tractor drawn sprayer that delivered 48 gpa at 320 psi on 13 Apr, 3, 17 May. Adult efficacy was assessed by counting the number of adults per leaf from each of 10 leaves per plot, 1 day before treatments were applied and 4, and 7 days after treatment. Because of heterogeneity of mean variances, insect data was first transformed (log10 x + 1) before analysis of variance. Treatment differences among means were estimated with the Ryan-Einot-Gabriel-Welsch multiple F test.

scholarly journals Evaluation of Experimental Compounds for Leafminer Control on Lettuce, 1996

1998 ◽  
Vol 23 (1) ◽  
pp. 107-108
Author(s):  
J. C. Palumbo ◽  
F. J. Reyes
Keyword(s):  
F Test ◽  
Insecticide Efficacy ◽  
University Of Arizona ◽  
Recorded Data ◽  
Direct Seeded ◽  
Mean Differences ◽  
The University ◽  
One Way Anova

Abstract Lettuce was direct seeded on 13 Sep. at the University of Arizona Yuma Agricultural Center. Each plot consisted of four, 60-ft-long beds spaced 42 inches apart and bordered on each side by 2 untreated beds. Plots were arranged in a CRB design with 4 replicates. Prior to application of treatments, a Lannate (0.75 lb (AI)/acre) and Karate (0.3 lb (AI)/acre) spray was applied to all plots on 27 Sep to control lepidopterous larvae. Foliar treatments were applied on 10 and 17 Oct with a tractor drawn sprayer operated at 150 psi, delivering 45 gpa. No spreader-sticker was added to any of the spray treatments. Insecticide efficacy was determined by randomly selecting 10 lettuce plants in each replicate and placing them in emergence containers for 3-4 weeks to allow for pupation and emergence of liriomyza and parasitoid adults. Adults were counted and their species recorded. Data were analyzed as a one-way ANOVA using a protected LSD F test to distinguish treatment mean differences.

scholarly journals Control of Sweetpotato Whitefly in Cantaloupe with Various Pesticides, 1992

1994 ◽  
Vol 19 (1) ◽  
pp. 80-80 ◽  
Author(s):  
J. C. Palumbo ◽  
C. H. Mullis ◽  
F. J. Reyes
Keyword(s):  
Cucumis Melo ◽  
Block Design ◽  
Bottom Surface ◽  
Local Practices ◽  
Water Plant ◽  
University Of Arizona ◽  
Randomized Complete Block Design ◽  
Direct Seeded ◽  
The University ◽  
Terminal Area

Abstract Cantaloupes, Cucumis melo, ‘Topmark’ were direct seeded on 3 Mar into single row “yuma beds” on 203 cm centers and thinned to 30 cm intervals at the University of Arizona, Yuma Valley Agricultural Center. Plots consisted of 4 beds, 18 m long with a 3.6 m buffer between plots. Plot preparation and seasonal maintenance followed local practices. Plots were arranged in a randomized complete block design with 4 replicates. Applications were made with a 4-row highpressure, electrostatic boom sprayer equipped with stainless steel, hollow-cone nozzles (TX-18) spaced at 50 cm and delivered 563 liters/ha at 400 psi. Admire was applied as a soil drench in 40 oz of water/plant one week after thinning (5 Apr). Foliar applications were initiated when immature whitefly densities exceeded 3 nymphs/leaf. A total of 3 applications of CGA215944 and Fenoxycarb were made on 29 Apr and 5, 14 May. The remaining foliar treatments were applied 5 times on 29 Apr, 5, 14, 20, and 28 May. The pH of the application water was 7.1. A spreader/sticker was not used. Insect data were collected only from the inner two beds of each plot. Plots were sampled weekly beginning on 14 Apr, and terminating on 9 June. Adult SPWF were assessed by randomly selecting 20 leaves from the terminal area on primary vines (4th fully expanded leaf from the apex of the vine) and counting the number of live adults on the bottom surface. Counts were made at sunrise between 0500-0600 hrs. Immatures were assessed by counting the number of eggs, small nymphs, large and red-eyed nymphs, and eclosed pupal cases on two-cm2 disk sections from each of 10 leaves per plot.

RADIOCARBON IN MEXICO: FROM PROPORTIONAL COUNTERS TO AMS

Radiocarbon ◽  
2021 ◽  
pp. 1-7
Author(s):  
Corina Solís ◽  
Efraín Chávez ◽  
Arcadio Huerta ◽  
María Esther Ortiz ◽  
Alberto Alcántara ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Sample Preparation ◽  
High Voltage ◽  
Accelerator Mass Spectrometry ◽  
Science And Technology ◽  
National Council ◽  
University Of Arizona ◽  
Technological Developments ◽  
High Voltage Engineering ◽  
The University

ABSTRACT Augusto Moreno is credited with establishing the first radiocarbon (14C) laboratory in Mexico in the 1950s, however, 14C measurement with the accelerator mass spectrometry (AMS) technique was not achieved in our country until 2003. Douglas Donahue from the University of Arizona, a pioneer in using AMS for 14C dating, participated in that experiment; then, the idea of establishing a 14C AMS laboratory evolved into a feasible project. This was finally reached in 2013, thanks to the technological developments in AMS and sample preparation with automated equipment, and the backing and support of the National Autonomous University of Mexico and the National Council for Science and Technology. The Mexican AMS Laboratory, LEMA, with a compact 1 MV system from High Voltage Engineering Europa, and its sample preparation laboratories with IonPlus automated graphitization equipment, is now a reality.

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