scholarly journals Residual Activity of Insecticides on Dendrobium for Control of Orchid Weevils, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 369-369
Author(s):  
A. H. Hara ◽  
T. Y. Hata
Keyword(s):  
Residual Activity ◽  
Exposure Period ◽  
Compressed Air ◽  
Polyethylene Film ◽  
Experiment Station ◽  
Arundina Graminifolia ◽  
The University ◽  
Basalt Rock

Abstract Bioassay tests were conducted from 10 Mar through 8 Apr (study 1) and 31 Aug through 22 Sep (study 2) at the University of Hawaii at Manoa, Waiakea Experiment Station in Hilo, HI. Established plants ‘Uniwai Supreme’ (study 1), and ‘Uniwai Pearl’ (study 2) growing in 0.5 inch crushed basalt rock under a Conley cold frame greenhouse (6 mil. clear FVG 3HLFI polyethylene film covering) were used in this study. Insecticides were applied once at 1,375 liters/ha using a compressed air sprayer with a 8004 Teejet nozzle at 40 psi. Sixteen leaves per treatment, 4 leaves per replicate, were removed weekly from the plant and placed into 12.0 × 10.5 cm unwaxed paper containers. Ten orchid weevils, field collected on bamboo orchids, Arundina graminifolia (D. Don) Hochr., were added to each container and covered with organdy. In study 1, leaf residues were assayed 7, 14, and 21 d after treatment. Weevil mortality and the number of feeding marks (injury) were assessed using a 5d exposure period. In study 2, residues were bioassayed 7 and 14 d after treatment and mortality and injury were assessed after a 2 d exposure period.

scholarly journals Insecticidal Trials Against Vanda Thrips on Orchids, Hawaii, 1994

1996 ◽  
Vol 21 (1) ◽  
pp. 381-381
Author(s):  
T. Y. Hata ◽  
A. H. Hara ◽  
B.K.S. Hu
Keyword(s):  
Acetic Acid ◽  
Treatment Efficacy ◽  
Analysis Data ◽  
Polyethylene Film ◽  
Light Bulb ◽  
Incandescent Light ◽  
Newport News ◽  
The University ◽  
Experimental Plots ◽  
Basalt Rock

Abstract Insecticides were evaluated for efficacy from 8 Dec through 15 Dec 94 at the University of Hawaii Waiakea Experiment Station in Hilo, Hawaii. Plants (approximately 6.5 ft in height) growing in basalt rock under 6 mil. clear FVG 3HLFI polyethylene film covering were used in this study. Experimental plots were arranged in a RCB with 3 blocks, 30 plants per block. A spreader-sticker (Ad-here, J. R. Simplot, Lanthrop, CA) was added to all treatments, including the control, at a rate of 5 ft. oz. per 100 gals. The control was sprayed with water. Insecticides were applied once at approximately 200 gpa using a backpack sprayer (Solo, Newport News, VA) equipped with an 8004 Teejet nozzle at 40 psi. Treatment efficacy was evaluated by randomly harvesting 30 blossoms from each block. Thrips were extracted from the blossoms with Berlese funnels heated with a 60 watt incandescent light bulb and collected in an 8:2:1:1 solution of ethanol, distilled H2O, acetic acid and glycerin. The number of nymphs and adults was pooled for analysis. Data were transformed to log10(x + 1) and analyzed by ANOVA.

Rotary Ultrasonic Machining of Basalt Rock Using Compressed Air As Coolant: A Study on Edge Chipping and Surface Roughness

2019 ◽  
Author(s):  
Palamandadige Fernando ◽  
Meng Zhang ◽  
Zhijian Pei ◽  
Adam Owens
Keyword(s):  
Surface Roughness ◽  
Cutting Force ◽  
Construction Material ◽  
Compressed Air ◽  
Ultrasonic Power ◽  
Ultrasonic Machining ◽  
Rotary Ultrasonic Machining ◽  
Machining Processes ◽  
Edge Chipping ◽  
Basalt Rock

Abstract The aim of this study is to investigate the edge chipping and surface roughness of basalt rock processed by rotary ultrasonic machining (RUM) using compressed air as coolant. Basalt rock is commonly used as a building and construction material for foundations and dams, as well as in architectural designs such as constructing thin veneers and facades. Rotary ultrasonic machining, a hybrid process of grinding and ultrasonic machining, is employed to drill difficult-to-machine materials such as ceramics, composites, titanium alloys, stainless steel, etc. RUM has many advantages over conventional machining processes such as twist drilling. These advantages include lower cutting force, higher surface quality, lower tool wear, etc. This paper is the first in literature to report a study on edge chipping and surface roughness on RUM of basalt rock using cold compressed air as coolant. The effects of three input variables (tool rotation speed, feedrate, and ultrasonic power) on cutting force, torque, edge chipping, and surface roughness were studied. Experimental results obtained from this investigation show that RUM with cold air as the coolant has the capability to machine holes in basalt rock with a surface roughness of less than 3.5 μm without severe edge chipping.

scholarly journals Head Cabbage, Microbial Control of Cutworm, Webworm, Cluster Caterpillar and Gardenlooper, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 66-66
Author(s):  
R. Muniappan ◽  
I.U. Silva-Krott
Keyword(s):  
Block Design ◽  
Microbial Control ◽  
Bare Soil ◽  
Agricultural Experiment Station ◽  
Experiment Station ◽  
Randomized Complete Block Design ◽  
Agricultural Experiment ◽  
The University ◽  
Head Cabbage ◽  
University Of Guam

Abstract The experiment was conducted at the Agricultural Experiment Station of the University of Guam, at the Inarajan site. The experiment was a randomized complete block design with four treatments and four replications. Each treatment consisted of four rows of head cabbage with eight plants on each row. Replications were separated by 60 cm of bare soil. Cabbage seedlings were planted 2 Mar 1993

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