California Agriculture, March-April 1981
Volume 35, Number 3
peer-reviewed research articles
California citrus acreage response to income tax reform
by Hoy F. Carman
Federal tax reform requiring capitalization of citrus grove development costs significantly reduced new plantings and total acreage.
Mediterranean fruit fly: The worst may be yet to come
by Kenneth S. Hagen , William W. Allen , Richard L. Tassan
Even if the fly spread to one-fourth of California's fruit-growing areas, the economic and ecological impact would be devastating.
Rumensin supplements for replacement heifers on irrigated pasture
by John L. Hull , Charles A. Raguse , Richard E. Delmas
Heifers fed 3.75 pounds per head per day of a barley-Rumensin supplement increased their average daily gain by 16 percent.Above-average replacement heifers can be reared for early breeding on energy-supplemented irrigated pasture plus Rumensin.
Lighter pruning lessens bunch rot of Chenin Blanc grapes
by L. Peter Christensen
Leaving up to 60 nodes at pruning reduced bunch rot in both spur- and cane-pruned Chenin blanc vines.Leaving 60 nodes per vine at pruning minimized bunch rot in this 2-year study without affecting vine vigor or grape composition.
Vegetative propagation of jojoba
by Clifford B. Low , Wesley P. Hackett
Jojoba was successfully propagated from stem cuttings taken during active growth. Cutting-grown plants matured sooner than seedlings.
Evaluating pumping plant performance
by Blaine R. Hanson , Roger W. Benton , Donald L. Lancaster
Operators can evaluate their pumps against design performance to determine irrigation efficiency and pinpoint potential trouble.A step-by-step procedure for measuring pump performance can identify and prevent potential irrigation problems.
Compatibility of now parasite with commercial sprayers
by James E. Lindegren , John E. Dibble , Charles E. Curtis , Tom T. Yamashita , Ed Romero
Studies show that a nematode parasite of navel orangeworm can be effectively applied to almonds by helicopter or ground sprayer.
Management of root-knot nematode on Rillito soybeans
by Demetrios G. Kontaxis , Robert W. Hagemann
Rillito soybean is susceptible to root-knot nematode and should not be planted in untreated soil after a susceptible crop.
Rooting and growth of dormant grapevine cuttings
by Curtis J. Alley , Albert T. Koyama
Rooting and growth of some dormant cuttings were as good after 1 or 2 years of cold storage as when fresh cuttings were used.
An evaporative cooler for vegetable crops
by James F. Thompson , Robert F. Kasmire
The low cost of this cooling system makes it especially suitable for small farmers and roadside merchants. It also can be used for short-term storage.A low-cost energy-efficient cooling system has been designed for field use by both large and small vegetable growers.
Potential new citrus pest: Japanese bayberry whitefly
by Mike Rose , Paul DeBach , James Woolley
A newcomer to California from Japan, this pest is spreading. Two predators have been successfully introduced, search for another is under way in China.The search is on for effective predators of this new insect pest from Japan, now spreading rapidly in southern California citrus.
editorial, news, letters & science briefs
The medfly invasion
by J. B. Kendrick