Double-flowered column stocks: Genetic crossover responsible for breakdown in percentage of doubles produced by succeeding generations of parent variety
AuthorsB. Lennart Johnson
Authors AffiliationsB. Lennart Johnson is Associate Professor of Floriculture and Ornamental Horticulture, University of California, Los Angeles; David Barnhart is Senior Laboratory Technician in Floriculture and Ornamental Horticulture, University of California, Los Angeles.
Hilgardia 9(9):7-16. DOI:10.3733/ca.v009n09p7. September 1955.
About 20% of the cost of field production of column stocks—Matthiola incana—as cut flowers is for seed because of the techniques required to obtain seed that will produce a satisfactory percentage of double flowers.
Also in this issue:Milk delivery costs and pricing: Adequacy in reflecting cost differences, simplicity in both application and enforcement vital factors in pricing systems
Use of pest control chemicals: Public law No. 518 effective July 22, 1955, of concern to all growers, shippers using pesticide chemicals on farm products
Minor nutrients of citrus: Effects of phosphorus fertilization on the minor element nutrition of citrus studied with three types of soil series
New soil fumigant: Increased growth of crop plants with weed killer of low toxicity to humans
Verticillium wilt resistance: Strawberries resistant to verticillium wilt also show resistance to powdery mildew in plant disease studies
Almond varieties on plum roots: Plum rootstocks being tested for suitability to almonds in wet areas or in soils infected with oak root fungus
Effective use of living shade: Studies show how selection and location of trees and shrubs can reduce extremes of summer temperatures in living areas
Citrus collection for research: Citrus relatives, species, varieties, strains, and hybrids provide materials for research on problems of citriculture
Potassium and lemon fruit size: Larger sizes obtained in soil cultures when potassium was increased and calcium decreased in laboratory experiments
New mite predators: Four species from Guatemala show promise in southern California.
Factors influencing the effectiveness of sodium chlorate as a herbicide
The toxicity of sodium arsenite and sodium chlorate in four California soils