California Agriculture, May 1960
Volume 14, Number 5
Washington navels on troyer citrange rootstocks
Soil properties and citrus production affected by management practices
by O. C. Taylor, L. H. Stolzy, R. B. Harding
Abstract Not Available – First paragraph follows: Decline in production and in size of fruit is an increasing problem in southern California's citrus groves. Package plot experiments, under way for some time, have not solved that problem, but they have provided promising leads. This report is concerned with one phase of the project—the effect of various treatments on production, fruit size, and the physical properties of the soil within the plots. Treatments were made in: navel orange groves at Redlands, Highlands, and Riverside; Valencia orange groves at Olive and Santa Paula; and a lemon grove at Ventura. Two replications of four tree plots were used in the groves at Redlands, Highlands, and Olive; four replications of four tree plots were used at Ventura and Santa Paula; and five replications of two tree plots were used at Riverside.
Disinfestation of planting sites may improve growth of Navel orange trees on Troyer citrange rootstock
by L. J. Klotz, T. A. Dewolfe, D. O. Rosedale, M. J. Garber
Abstract Not Available – First paragraph follows: Whether Troyer citrange rootstock can be used successfully in old citrus soils, or in soils contaminated by microorganisms that attack citrus roots, and whether it is profitable to pretreat planting sites to disinfest them of root-destroying fungi were objectives of experiments in southern California.
Influence of extractives on seasoning stain of redwood lumber
by Arther B. Anderson
Abstract Not Available – First paragraph follows: The distinctive color of redwood is due—in part, at least—to the nature of its extractive components. The excellent durability of redwood heartwood also is attributed to the fungicidal properties of its extractives. However, one of the problems associated with the manufacture of redwood lumber is the chemical seasoning stain resulting from the chemical nature of some of the extractives.
Responses of rice to photoperiod
by D. P. Ormrod, W. A. Bunter, D. C. Finfrock, J. R. Thysell
Abstract Not Available – First paragraph follows: Experiments indicate that photoperiod, or daylength, is of great importance in the heading of rice plants and that maturity of rice varieties can be classified in the field by their sensitivity to above-optimum daylength. Early varieties such as Colusa are less sensitive and will head in the field under the longer days of midsummer, while Caloro, a midseason variety, is more sensitive and heads in the field later in the summer after the photoperiod has shortened considerably. A very late variety such as Texas Patna 49 is highly sensitive to photoperiod and does not head until the days have become much shorter in the fall.
Nematode-free garlic planting stock
by Louis K. Mann
Abstract Not Available – First paragraph follows: Plants propagated vegetatively, rather than by true seed, frequently carry diseases in the vegetative parts. One of the diseases of garlic, the stem and bulb nematode, is carried in the cloves and has become widely established
Goleta tests probe effects on lemon production by accumulated soil nitrogen
by O. C. Taylor, P. F. Pratt, George Goodall
Abstract Not Available – First paragraph follows: Nitrogen is a necessary element in the production of fruit but there is considerable confusion as to the most economical amounts to use and the most satisfactory timing of the applications.
Fly control on a mushroom farm in southern California
by Frank S. Morishita
Abstract Not Available – First paragraph follows: Flies in mushroom houses act as carriers of various mushroom diseases. In addition, fly larvae break down the compost of the mushroom producing beds, in which the flies breed, and feed on the mushroom mycelia. In southern California, where mushrooms are grown throughout the year, the problem of fly reinfestation from the outside is always present. Phorid and sciarid flies are the most numerous, attracted by the odor of the beds immediately after spawning. Infestations are heaviest after wet weather or following irrigation of adjacent areas. Control is necessary both for protection of the mushrooms and from the standpoint of sanitation. Flies must be kept out of the producing houses and nearby dwellings. One large mushroom farm has developed a successful fly-control program.
editorial, news, letters & science briefs
Decline of redwood trees
by Pad I. Zinke
Chemical changes in processed foods
by B. S. Luh
Lygus bug damage to table beet seed
by Elmer C. Carlson
True plant bugs on stone fruits
by Francis M. Summers
Nematodes attacking cotton
by M. W. Allen
Trees required in life cycle of certain root aphids
by W. H. Lange
Weed control in sweet pea seed crop at Lompoc
by Jack L. Bivins
Economic aspects of fertilizing high value crops in California fields
by G. W. Dean, C. O. Mccorkle, H. O. Carter