Hilgardia
Hilgardia
Hilgardia
University of California
Hilgardia

Fungi on spotted alfalfa aphid: Spread of fungi by natural and artificial means is resulting in excellent biological control of aphid in many counties

Authors

Irvin M. Hall
Paul H. Dunn

Authors Affiliations

Irvin M. Hall is Assistant Insect Pathologist in Biological Control, University of California, Riverside; Paul H. Dunn is Senior Laboratory Technician in Biological Control, University of California, Riverside.

Publication Information

Hilgardia 11(2):5-14. DOI:10.3733/ca.v011n02p5. February 1957.

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Abstract

Five unidentified species of parasitic entomophthorous fungi are now known to be attacking the spotted alfalfa aphid—Therioaphis maculata (Buckton)—in California.

Hall I, Dunn P. 1957. Fungi on spotted alfalfa aphid: Spread of fungi by natural and artificial means is resulting in excellent biological control of aphid in many counties. Hilgardia 11(2):5-14. DOI:10.3733/ca.v011n02p5

Also in this issue:

Agricultural-business outlook: Farmers must understand and apply economic principles to the business of modern agricultural production by scientific means

Peach tree borer control tests: Fall treatments with soil fumigants and use of trunk sprays evaluated in experimental program during the 1955–56 seasons

Aphid resistance to parathion: Nonphosphate insecticides under study for control of spotted alfalfa aphid where pest develops resstance to parathion

Soil fumigation for nematodes: Nematocides tested for the control of root-knot nematodes affecting fresh market and canning tomato crops in California

Codling moth infestations up: Damage to harvested walnuts increased markedly in northern California during the 1956 season in comparison with 1955

California scaly bark disease of citrus: No known cure for infected trees but treatment in early stages of disease can retard its advance into successive stages with their increasing economic loss

Bartlett pears for canning: Ripeness of fruit at time of processing affects color, flavor, aroma, and over-all quality of finished product

Citrus weed control by monuron: Experiments with urea herbicides for weed control in citrus orchards encouraging but use of the chemicals is restricted

Weed control near grass areas: Soil fumigants and contact spray materials included in series of studies on control of weeds in relatively confined areas

Effect of zinc applications on the crop of grapefruit trees affected with mottle-leaf

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