November 1969

Cover: Citrus seedlings being examined by Ray Copeland, Superintendent at the Lindcow Field Station, Tulare County, are part of the station’s extensive research toward development of new, disease resistant varieties for San Joaquin Valley plantings.

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California Agriculture, November 1969

Volume 23, Number 11

research articles

Disease control with pathogen-free bulb stocks for easter lily improvement
by J. G. Bald , A. O. Paulus , John V. Lenz , P. A. Chandler , Terry Suzuki
pp6-7, doi#10.3733/ca.v023n11p6
Abstract
Abstract Not Available – First paragraph follows: AN INQUIRY INTO the root and bulb diseases of Easter lilies, begun in the 1950's, has involved the whole lily-bulb industry in radical changes. Growers co-operating with University Extension and Experiment Station research workers field-tested methods developed in the laboratory and useful changes were quickly accepted by growers. Improved planting stocks were introduced, methods of propagation have been radically altered, and cultural practices have been changed. Improved methods of disease control have made many of these advances possible.
Expanded Abstract | PDF

Vegetative mapping with false-color infrared aerial photography …and comparison with black and white
by Donald T. Lauer
pp8-10, doi#10.3733/ca.v023n11p8
Abstract
This study was made to determine the extent to which the species composition of timber stands and other types of vegetative cover could be interpreted from high-altitude, small-scale, vertical Ektachrome Infrared Aero photographs. Comparisons were also made between interpretations of conventional black-and-white panchromatic aerial photography—used extensively throughout the world by agriculturalists and foresters—and those derived from color infrared photography (a false-color tri-emulsion layer reversal film type originally developed for military purposes). Results indicate that while color offers only a slight increase in interpretation accuracy (at an added cost) over black and white, other factors involved may be even more significant. These include considerable savings possible in man hours and labor costs through the possibility of faster and less fatiguing analysis by the interpreters.
Expanded Abstract | PDF

Cut rose production increase with nematode control
by D. E. Johnson , Bert Lear , S. T. Miyagawa , R. H. Sciaroni
pp11-12, doi#10.3733/ca.v023n11p11
Abstract
These experiments show that with the use of a particular application technique, DBCP (1,2-dibromo-3-chloropropane) effectively reduces the nematode population around the roots of greenhouse rose plants. The reduction in population of these nematodes in the soil also resulted in increased flower production. At the end of the 26th week after the first treatment there were approximately 13,000 more blooms per acre in the Pink Sensation variety plots, and 19,000 more blooms per acre in the Golden Wave plants, as compared with the untreated check plots.
Expanded Abstract | PDF

Control of verticillium and sclerotinia of chrysanthemums with systemic fungicides
by Seward T. Besemer , Arthur H. Mccain , Albert O. Paulus
pp12-13, doi#10.3733/ca.v023n11p12
Abstract
Verticillium wilt caused by Verticillium albo-atrum and sclerotinia white rot caused by Sclerotinia sclerotiorum are two diseases of commercial chrysanthemums in San Diego County. Previously, the only control of verticillium wilt was soil treatment with chloropicrin or steam prior to planting. In young plants sclerotinia can be prevented by these same soil treatments but tests reported here also show control possibilities by pre-plant application of fungicides on the soil surface. Sclerotinia control may be variable in a maturing cut-flower crop under moist greenhouse conditions where the fungus attacks high on the stems.
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Sweet cherry hedgerow planting
by Kay Ryugo , Felix Mikuckis
pp14-15, doi#10.3733/ca.v023n11p14
Abstract
An easy-to-train hedgerow planting of sweet cherries which begins bearing early and which can be maintained at a desirable height may have some advantages over current pruning and training systems.
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Effects of time of shearing on wool and lamb production
by D. T. Torell , W. C. Weir , G. E. Bradford , G. M. Spurlock
pp16-18, doi#10.3733/ca.v023n11p16
Abstract
Time of shearing does affect both wool and lamb production and also ewe mortality. Shearing during seasons of the year other than spring and summer can increase lamb production and also produce stronger wool fibers. Shelters and additional feed are required if bad storms strike after winter shearing.
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Plastic containers for avocado nursery trees
by R. M. Burns
pp18-19, doi#10.3733/ca.v023n11p18
Abstract
Abstract Not Available – First paragraph follows: PLASTIC CONTAINERS for avocado nursery trees are relatively new in California, but nurserymen are showing increasing interest in them. One of the most popular avocado nursery containers for many years has been the tarpaper cylinder made from heavy roofing paper. These tarpaper containers have two main shortcomings: the relatively high labor cost of cutting and stapling; and frequent disintegration.
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editorial, news, letters & science briefs

EDITORIAL: Science needs roots in the soil
by George B. Alcorn
pp2, doi#10.3733/ca.v023n11p2
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General Information

Amino acid analyzer University of California, Riverside
Editors
pp3, doi#10.3733/ca.v023n11p3
PDF

Lindcove field station
Editors
pp4-5, doi#10.3733/ca.v023n11p4
PDF