Air Deflector Effects on Aerial Sprays

1994 ◽  
Vol 37 (3) ◽  
pp. 725-733 ◽  
Author(s):  
A. R. Womac ◽  
J. E. Mulrooney ◽  
B. W. Young ◽  
P. R. Alexander
Keyword(s):  
Aerial Sprays

CHARACTERISTICS OF SPRAY DEPOSITS RESULTING FROM AIRCRAFT APPLICATION OF OIL-CARRIER SPRAYS

1957 ◽  
Vol 37 (2) ◽  
pp. 85-96 ◽  
Author(s):  
J. J. Sexsmith ◽  
D. T. Anderson ◽  
G. C. Russell ◽  
W. W. Hopewell ◽  
H. Hurtig
Keyword(s):  
Petri Dish ◽  
Ground Level ◽  
Assessment Data ◽  
Tip Vortices ◽  
Spray Booth ◽  
Oil Mixtures ◽  
Small Plot ◽  
Aerial Sprays ◽  
Aircraft Application ◽  
Wing Tip

Assessments were made of the physical properties of spray deposits from upwind and crosswind, single and multiple flight applications of oil-carrier spray applied by a small aircraft equipped for commercial weed spraying. Volume deposits were determined colorimetrically on petri dish collections of the dyed spray. Droplet assessment data were obtained from photographic enlargement of printflex sampling cards.Three peaks of spray deposit were found, resulting from the propeller blast and the wing-tip vortices. A greater percentage of spray was recovered at ground level, and more variation in volume deposit and droplet size occurred across the effective spray swath, in the upwind flight than in the crosswind flight application. Information obtained from these tests will be used in the construction of a spray booth, designed to apply simulated aerial sprays on a practical small-plot basis, for determining the causes of injury to grain crops resulting from aerial application of herbicide-oil mixtures.

A SYSTEM FOR TEMPORAL SAMPLING OF AERIAL SPRAYS

1991 ◽  
Vol 34 (6) ◽  
pp. 2349-2354
Author(s):  
R. W.Whitney ◽  
M.L.Stone ◽  
D. K. Kuhlman
Keyword(s):  
Temporal Sampling ◽  
Aerial Sprays

Effect of GF-120 (Spinosad) Aerial Sprays on Colonies of the Stingless Bee Scaptotrigona mexicana (Hymenoptera: Apidae) and the Honey Bee (Hymenoptera: Apidae)

2018 ◽  
Vol 111 (4) ◽  
pp. 1711-1715 ◽  
Author(s):  
Enoc Gómez-Escobar ◽  
Pablo Liedo ◽  
Pablo Montoya ◽  
Agustín Méndez-Villarreal ◽  
Miguel Guzmán ◽  
...  
Keyword(s):  
Honey Bee ◽  
Stingless Bee ◽  
Scaptotrigona Mexicana ◽  
Aerial Sprays

Use of Aerial Sprays for Correcting Magnesium Deficiency in Orange Groves

1969 ◽  
Vol 5 (4) ◽  
pp. 339-342 ◽  
Author(s):  
A. Bar-Akiva ◽  
D. Tal ◽  
J. Hirsh
Keyword(s):  
Magnesium Deficiency ◽  
Field Trials ◽  
Magnesium Nitrate ◽  
Valencia Orange ◽  
Orange Orchard ◽  
Aerial Sprays ◽  
Mg Content ◽  
Interior Part

SummaryField trials were carried out using an aerial spray of Magniosan 55 (55 per cent magnesium nitrate) for the correction of severe magnesium deficiency in a Valencia orange orchard. Two treatments were applied, in autumn and spring respectively, each containing 50 l. Magniosan 55 solution in 200 l. water per hectare. The spray did not cause damage to fruit or leaves, penetrated satisfactorily into the lower and interior part of the canopy, and increased the Mg content of the leaves of treated trees from 0·095 to 0·190 per cent.

scholarly journals Airblast Application of Copper Fungicide to Grapefruit Does Not Affect Windscar

HortScience ◽  
2004 ◽  
Vol 39 (3) ◽  
pp. 516-519 ◽  
Author(s):  
Ed Stover ◽  
Jack Hebb ◽  
Ron Sonoda ◽  
Masoud Salyani
Keyword(s):  
Citrus Paradisi ◽  
Aerial Application ◽  
Commercial Harvest ◽  
River Region ◽  
Primary Means ◽  
Wind Velocities ◽  
Indian River ◽  
Aerial Sprays ◽  
Copper Fungicide ◽  
Natural Wind

Wind-induced blemishing known as windscar and lesions from the disease melanose (caused by Diaporthe citri) are two of the most important causes of fresh grapefruit (Citrus paradisi) cullage in Florida. Copper hydroxide fungicides are the primary means of controlling melanose, but high air velocities from passing sprayers have been suspected of increasing windscar. In 1998 and 1999, airblast applications of Cu(OH)2 (1.7 kg·ha-1 Cu) were made at a range of early fruit development stages to a fresh grapefruit orchard in the Indian River region of Florida. These applications supplemented aerial sprays of Cu(OH)2 that were made uniformly across the entire experimental site at biweekly intervals beginning near full bloom. During the commercial harvest period fruit were sampled from three regions (interior, upper exterior, and lower exterior) of each treatment tree and were evaluated for percentage of fruit surface covered by windscar and severity of melanose. Airblast applications did not affect windscar in either year, but windscar was significantly greater from the upper exterior of the canopy, which is likely to experience the highest natural wind velocities. From these data, it appears unlikely that airblast applications significantly contribute to windscar of Indian River grapefruit. In 1998, no trees receiving airblast applications had significantly lower melanose incidence than the trees sprayed only via aircraft; however, trees receiving four airblast applications were scored as having higher apparent melanose on exterior samples than trees receiving most other treatments. This is consistent with high levels of Cu injury on these fruit which can superficially resemble melanose. Following treatment in 1999, trees receiving four airblast applications of Cu(OH)2 had significantly lower melanose scores than trees receiving either no or only early airblast applications, but were not significantly different from trees receiving a single spray 5.5 weeks postbloom. A computer model, which estimates Cu levels on fruit based on fruit growth, rainfall, and application parameters, indicated exterior fruit receiving four airblast sprays had >3 μg·cm-2 [Cu] for 40 days in 1998 but only 10 days in 1999, which reflects increased probability of Cu damage in 1998. It appears that aerial application supplemented by airblast merits further study as an economical means of melanose control.

SIMULATING AERIAL SPRAYS FOR THE WESTERN SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE): EVALUATION OF TECHNIQUE AND TWO CANDIDATE INSECTICIDES

1981 ◽  
Vol 113 (9) ◽  
pp. 819-825 ◽  
Author(s):  
Charles E. Richmond
Keyword(s):  
Spruce Budworm ◽  
Spray Application ◽  
Western Spruce Budworm ◽  
Aerial Application ◽  
Application System ◽  
Subalpine Fir ◽  
Preliminary Information ◽  
Population Reduction ◽  
Aerial Sprays ◽  
Deposit Characteristics

AbstractA new spray application system which mimics the spray deposit of aerial applications of chemical insecticides was developed and tested using acephate at the rate of 60 g a.i./L (U.S. Environmental Protection Act registered dosage) on small Douglas-fir and subalpine fir trees infested with western spruce budworm. The system successfully duplicated aerial application by causing a budworm population reduction equivalent to previous aerial tests having analogous insecticide deposit characteristics. Using the system, preliminary information was gained on the effectiveness of sulprofos and thiodicarb. When delivered at a rate of 4.1 L/ha, sulprofos caused a budworm population reduction of 86.2% at 22.4 g a.i./L and thiodicarb caused a reduction of 98% at 45 g a.i./L.

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