California Agriculture, March-April 1983

Volume 37, Number 3

peer-reviewed research articles

Using “blowdown” water to irrigate crops
by William A. Jury , Lewis H. Stolzy , Carl A. Fox , Henry J. Vaux , Ian R. Straughan
pp4-5, doi#10.3733/ca.v037n03p4
Abstract
Though not profitable, it could be less expensive than disposing of cooling water by evaporation
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Foreign workers in selected California crops
by Richard Mines , Philip L. Martin
pp6-8, doi#10.3733/ca.v037n03p6
Abstract
Some crops depend on a flow of illegal workers from Mexico
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Side-whip grafting of grapevines to change over varieties
by Curtis J. Alley , Stephen F. Gallagher
pp8, doi#10.3733/ca.v037n03p8
Abstract
Topworking vines earlier in the spring
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Evaluating low-pressure sprinkler systems
by Blaine R. Hanson , Herbert Schulbach , Jewell L. Meyer
pp10-12, doi#10.3733/ca.v037n03p10
Abstract
Use caution in modifying a system
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Clipping chaparral as a brush-management technique
by Theodore E. Adams , Walter L. Graves
pp12-14, doi#10.3733/ca.v037n03p12
Abstract
If done long enough, the technique might reduce total aboveground fuel load
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Modifying weed sprayers for citrus thrips control
by Harold S. Elmer , O. L. Brawner , Joseph G. Morse
pp15-16, doi#10.3733/ca.v037n03p15
Abstract
Vertical booms attached to weed sprayers work well for citrus thrips control
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Comparison of four crops for alcohol yield
by F. Jack Hills , Stanley S. Johnson , Shu Geng , Akbar Abshahi , Gary R. Peterson
pp17-19, doi#10.3733/ca.v037n03p17
Abstract
One crop has no great advantage over others tested in this study
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Fungicides for powdery mildew and rust in roses
by Albert O. Paulus , Jerry Nelson
pp20-21, doi#10.3733/ca.v037n03p20
Abstract
Not available – first paragraph follows: Powdery mildew is undoubtedly the most widespread disease of roses. The casual fungus, Sphaerotheca pannosa var. rosae, appears as a white or gray powdery or mealy coating on the leaves, tender stems, and flowerbuds. It distorts and discolors those areas, causes defoliation, and reduces plant vigor.
Expanded Abstract | PDF

California's low-income producer cooperatives
by Refugio I. Rochin , Steven Huffstutlar
pp21-23, doi#10.3733/ca.v037n03p21
Abstract
They're suited for some labor-intensive crops
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Doubling potential of sweet cherry cultivars
by Warren C. Micke , James F. Doyle , James T. Yeager
pp24-25, doi#10.3733/ca.v037n03p24
Abstract
Not available – first paragraph follows: Sweet cherry production in the Sacramento and southern San Joaquin valleys of California has historically been limited by excessive fruit doubling on the commonly grown cultivars. High summer temperatures at the time of flower bud differentiation are generally believed to cause double pistils to form, resulting in many double or spur (one side of the double aborted) fruit at harvest time the following year. Double and spur fruit are considered culls in commercial market channels, and they tend to be more prone to decay than normal cherries.
Expanded Abstract | PDF

Monitoring lepidopterous pest damage to processing tomatoes
by Frank G. Zalom , Lloyd T. Wilson , Michael P. Hoffmann , W. Harry Lange , Craig V. Weakley
pp25-26, doi#10.3733/ca.v037n03p25
Abstract
Not available – first paragraph follows: Few quantitative procedures exist for monitoring lepidopterous pests in processing tomatoes, yet reliable, cost-efficient sampling techniques are essential for the implementation of an integrated pest management program. These sampling techniques must be of such intensity as to predict the amount of damage with a given degree of reliability, yet sufficiently time-efficient to be useful to growers or crop consultants. Without such procedures, assessing a pest's status is subjective and may result in unnecessary control actions. Reliable control decision criteria are especially important in processing tomatoes, where thresholds for damage are set by government or industry standards, and exceeding damage thresholds can result in rejection of the crop.
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Fungus causes deterioration of dried prunes
by Peter L. Sholberg , Joseph M. Ogawa
pp27-28, doi#10.3733/ca.v037n03p27
Abstract
Not available – first paragraph follows: Deterioration of dried French prunes is characterized by macerated, wet, sticky areas on the fruit surface and by skin that tends to slip with the slightest pressure. This condition is most often the result of fresh-fruit decay caused by the fungus Rhizopus stoioni/er. The mold is also known as “bread mold fungus” or the “whiskers disease” on fresh market stone fruits, strawberries, and almond hulls. Prune growers have called this type of deterioration of dried prunes “box rot” and have suspected it to be responsible for serious losses.
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Incidental effects of agricultural water conservation
by David C. Davenport , Henry J. Vaux , Robert M. Hagan
pp28-31, doi#10.3733/ca.v037n03p28
Abstract
Conserving water can have both beneficial and adverse effects
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Parasitic nematode controls western poplar clearwing moth
by Harry K. Kaya , James E. Lindegren
pp31-32, doi#10.3733/ca.v037n03p31
Abstract
Borers were reduced by one treatment
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editorial, news, letters & science briefs

EDITORIAL: The winrock report
by Lowell N. Lewis
pp2, doi#10.3733/ca.v037n03p2
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