July 1969

Cover: Researchers investigate potential of fingerling rainbow trout for control of snow mosquito larvae at South I,ake Tahoe.

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California Agriculture, July 1969

Volume 23, Number 7

research articles

Insect problems in forest recreation areas pine needle scale… mosquitoes
by D. L. Dahlsten , R. Garcia , J. E. Prine , R. Hunt
pp4-6, doi#10.3733/ca.v023n07p4
Abstract
Abstract Not Available – First paragraph follows: Man's exploitation of his surroundings with disregard for nature's interrelationships has led to serious environmental problems including pollution of the air, water, and land. All of man's activities influence his environment in one way or another. The problem is to find ways to minimize this influence and make sure that these activities disrupt the environment as little as possible.
Expanded Abstract | PDF

Weed control in nonbearing citrus
by A. H. Lange , B. B. Fischer , G. Suthers
pp7-8, doi#10.3733/ca.v023n07p7
Abstract
Abstract Not Available – First paragraph follows: WEED CONTROL IN CITRUS nurseries is one of the most expensive cultural practices in citrus tree production. Earlier research has shown Simazine (Princep), diuron (Karmex), bromacil (Hyvar X), terbacil (Sinbar), and paraquat can be used effectively around bearing citrus. However, very few herbicides are usable on the 67,000 acres of young non-bearing citrus in California. The object of the studies reported here was to evaluate several herbicides for pre- and post-emergence weed control in citrus nurseries.
Expanded Abstract | PDF

SW44 nondormant alfalfa with stem nematode resistance released to plant breeders
by W. F. Lehman , E. H. Stanford , F. V. Lieberman , W. E. Bendixen , W. H. Isom , V. L. Marble
pp9-10, doi#10.3733/ca.v023n07p9
Abstract
Abstract Not Available – First paragraph follows: A NEW NONDORMANT ALFALFA Strain (SW44), segregated for stem nematode resistance and tolerance to leaf and stem diseases, has been developed through the joint efforts of the University of California Agricultural Experiment Station and Agricultural Extension Service, and the U. S. Department of Agriculture Entomology Research Division.
Expanded Abstract | PDF

A progress report… citrus response to removed terminal buds and leaves
by S. B. Boswell
pp10-11, doi#10.3733/ca.v023n07p10
Abstract
Abstract Not Available – First paragraph follows: IT HAS BEEN KNOWN for many years that the apical buds inhibit the growth and development of lateral buds. This inhibition is largely due to growth regulators produced by the apical shoot and leaves. Other researchers have reported that buds are also inhibited by the presence of growing leaves—and that in several herbaceous species, the expanded leaves partially inhibited their axillary buds. Long after the removal of the terminal buds, the leaves delayed axillary bud growth. Defoliation has been shown to significantly accelerate bud growth of Poncirus trijoliata. However, length of time to bud growth varied with the season. The addition of 1 per cent NAA in lanolin paste to the leaf scars of defoliated plants inhibited bud growth. This auxin produced by the leaves may be responsible for inhibition of bud growth, as is auxin produced by the apical bud.
Expanded Abstract | PDF

Effects of Ethrel on fruit ripening of tomatoes… greenhouse, field and postharvest trials
by William L. Sims
pp12-14, doi#10.3733/ca.v023n07p12
Abstract
Abstract Not Available – First paragraph follows: Studies with Ethrel (2-chloroe-thanephosphonic acid) on pickling cucumbers have demonstrated the effects of this chemical plant regulator on sex expression and growth development. Recently several research workers have reported favorably on the influence of this ethylene releasing compound on tomato fruit development and maturation.
Expanded Abstract | PDF

Response of eckespoint C-1 poinsettia to growth retardants
by S. T. Besemer
pp15, doi#10.3733/ca.v023n07p15
Abstract
Abstract Not Available – First paragraph follows: PREVIOUS EXPERIMENTS have shown that the response of commercial potted poinsettias to growth retardants varies widely according to plant variety, type of chemical used, rate and time of application. The objective of this 1968 trial, conducted at Paul Ecke, Inc., San Diego County, was to determine the response of the newly released variety, Eckespoint C-1.
Expanded Abstract | PDF

Control of thrips on chrysanthemums grown for cut flowers
by F. S. Morishita , R. N. Jefferson , W. A. Humphrey , S. T. Besemer
pp16-17, doi#10.3733/ca.v023n07p16
Abstract
Azodrin and Temik were the most effective materials for control of thrips on chrysanthemums in these tests. Both materials gave quick and long-lasting control.
Expanded Abstract | PDF

Irrigated pastures compete favorably with other field crops in California
by J. L. Hull , C. A. Raguse
pp18-19, doi#10.3733/ca.v023n07p18
Abstract
Irrigated pastures can compete successfully with many other California field crops—providing that careful control is kept of livestock stocking rates, that efficient irrigation practices are maintained, and that high yielding, well-adapted, palatable forage species are used.
Expanded Abstract | PDF

editorial, news, letters & science briefs

EDITORIAL: Keeping California beautiful
by Vernon T. Stoutemyer
pp2, doi#10.3733/ca.v023n07p2
PDF

General Information

“Space” chamber U.C. Berkeley
Editors
pp3, doi#10.3733/ca.v023n07p3
PDF