Some mosaic diseases of Prunus species
AuthorsH. Earl Thomas
T. E. Rawlins
Authors AffiliationsH. Earl Thomas was Associate Plant Pathologist in the Experiment Station; T. E. Rawlins was Associate Professor of Plant Pathology and Associate Plant Pathologist in the Experiment Station.
Hilgardia 12(10):623-644. DOI:10.3733/hilg.v12n10p623. November 1939.
Abstract does not appear. First page follows.
In the absence of a visible fungus or bacterial pathogene, the diagnosis of a plant disease depends in a large measure upon the recognition of symptoms. This observation is particularly applicable in the study of diseases of deciduous fruit trees in California where there is found a relatively greater proportion of virus and nontransmissible diseases than is the case in more humid areas. It has seemed desirable, therefore, to assemble and to study, under comparable conditions, some of the prevalent virus diseases of deciduous fruit trees and to improve the criteria for distinguishing these from nontransmissible diseases such as exanthema and little-leaf, or rosette, the latter of which may cause symptoms on grape leaves strongly suggestive of a mosaic disease.
It is a rather remarkable fact that none of the several well-known virus diseases of stone fruits in eastern United States, namely, peach yellows, peach rosette, little peach, and phony peach, have been found in California. On the other hand, there are a considerable number of virus diseases of these plants in California, few or none of which seem to be established in the eastern states. Among the latter group, only cherry buckskin (8)4 and peach mosaic (3), (6) have been studied in any detail.
The earlier plan of this work, begun in 1932, involved the collection of those virus-type diseases that were found on deciduous fruit trees from which the more important were to be selected for further study.
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Also in this issue:Canned fruits market, 1958-59: Sales records set by California's major canned fruit packs in 100th year but reduced crops influence 1958-59 outlook
Mechanical fruit tree shaking: Effect of frequency and stroke on fruit removal and power requirements analyzed in study of reciprocating type shaker
Rooting pear, plum rootstocks: Growth-regulator treatments and a warm preplanting storage period promoted rooting of fall-collected hardwood cuttings
Drill seeding of forage ranges: Heavy duty drill permits good placement of desirable grass and legume seeds for establishment of pasture on range land
Weeds controlled with cyanamid: New method for treating winter leafy vegetable crops with calcium cyanamid controlled weeds at moderate cost in tests
New selective herbicide tested: CDEC applied in pre-emergence treatment of seeded lettuce shows promise for selective weed control without crop injury
Nitrification of fertilizers: Ammoniacal fertilizers used in study on the rate nitrifying bacteria function at various ammonia concentrations in soils
Deficiencies of micronutrients: Influence of phosphate fertilizers on micronutrients in avocado leaves subject of long-term study of Fuerte orchard
Septoria leaf scorch of azalea: Disease especially severe in cloudy, damp weather controlled by spray treatment in tests on experimental plot in Eureka
Lemon fruit quality studied: Comparative tests made of several new strains frequently used to avoid some diseases prevalent in old line Eurekas
Four new asparagus varieties: Now in third season of trial in experimental and commercial plantings, new varieties show promise but more testing needed
Mosaic diseases of the rose in California