Resistance to fumigation: Studies of outbreak in southern California reveal resistance to hydrogen cyanide fumigation persists
Authors
Paul D. GerhardtDavid L. Lindgren
Authors Affiliations
Paul D. Gerhardt is Assistant Entomologist, University of California College of Agriculture, Riverside; David L. Lindgren is Entomologist, University of California College of Agriculture, Riverside.Publication Information
Hilgardia 5(10):7-12. DOI:10.3733/ca.v005n10p7b. October 1951.
PDF of full article, Cite this article
Abstract
Citricola scale–Coccus pseudomagnoliarum (Kuw.)–in citrus growing areas of California is still resistant to hydrogen cyanide–HCN–fumigation.
Gerhardt P, Lindgren D. 1951. Resistance to fumigation: Studies of outbreak in southern California reveal resistance to hydrogen cyanide fumigation persists. Hilgardia 5(10):7-12. DOI:10.3733/ca.v005n10p7b
Also in this issue:
Marketing channels studied: Marketing of fresh carrots, celery and asparagus in California studied to determine channelsBlood-spotting in eggs: Controlled by breeding in a ten-generation selection experiment with Single Comb White Leghorns
Lettuce growth rates: Investigations find heat unit accumulations not a reliable means of predicting harvest time
Invisible injury of citrus: Insecticide tests indicate that oil sprays lower soluble solids in juice and reduce dry matter in leaves
Lithium toxicity in citrus: Recognized on leaves in a grove in Santa Barbara County on the basis of artificially produced symptoms
Citricola scale control: Tests find parathion a control agent of outstanding promise in commercial navel and Valencia orange groves
Westside dust test plots: Studies designed to develop plants and grazing systems for effective dust control under way in three counties
Research at field stations: Local agricultural problems are studied and fundamental research applied in distributed outdoor laboratories
Lemon fruit quality: Rootstocks affect juice content, soluble solids, acidity of Eurekas
Citrus-root nematodes on olive: Pest pathologically and morphologically similar to that on orange roots infests and reproduces on olive roots
Nontoxic ferns: Feeding tests with cattle find gold fern, bird's foot fern nontoxic
Swine production: Main factors of improvement are prolificacy, milk production, type
Growth and yield of certain Gramineae as influenced by reduction of photosynthetic tissue