Facebook
X (Twitter)
Reddit
Pinterest
Tumblr
Delicious
LinkedIn
StumbleUpon
Pear decline research
Authors
W. H. GriggsK. Ryugo
R. S. Bethell
K. Uriu
Authors Affiliations
W. H. Griggs is Professor of Pomology, University of California, Davis; K. Ryugo is Assistant Pomologist, U. C., Davis; R. S. Bethell is Farm Advisor, El Dorado County; K. Uriu is Assistant Pomologist, U. C., Davis.Publication Information
Hilgardia 16(6):9-10. DOI:10.3733/ca.v016n06p9. June 1962.
PDF of full article, Cite this article
Abstract
High summer temperatures appear to be an important contributing factor—in combination with psylla feeding—adding to tree losses from pear decline. Thus far, none of the sprays, ground applications, injections, or scoring treatments have had any discernible effect on the progress of pear decline. None of the treated or control trees improved, a few apparently held their own, but most have deteriorated.
Griggs W, Ryugo K, Bethell R, Uriu K. 1962. Pear decline research. Hilgardia 16(6):9-10. DOI:10.3733/ca.v016n06p9
Also in this issue:
“… Reality better than the dream.”: Judge Shields' centennial messageA Progress report: Grape mechanical harvesting comes closer to reality
Seed size effects: On hybrid sweet corn in Coachella Valley
Temperature and olive yields
Wild oats sown for science yield the improved Sierra variety
Plum root stocks for almonds: Incompatibility emphasized in source mix-up with certain plum combinations
Cotton yields: Not affected by irrigation method on panoche clay loam
The proposed Trade Expansion Act of 1962 and California Agriculture
The picric acid method for determining minute amounts of hydrocyanic acid in fumigated insects,
Relation of mortality to amounts of hydrocyanic acid recovered from fumigated resistant and nonresistant citrus scale insects