The integration of chemical and biological control of the spotted alfalfa aphid: The integrated control concept
AuthorsVernon M. Stern
Ray F. Smith
Robert van den Bosch
Kenneth S. Hagen
Authors AffiliationsMr. Stern was Assistant Entomologist in Entomology, Citrus Experiment Station, Riverside; Mr. Smith was Associate Professor of Entomology and Associate Entomologist in the Experiment Station, Berkeley; Mr. van den Bosch was Associate Entomologist in Biological Control) Citrus Experiment Station, Riverside; Mr. Hagen was Associate Entomologist in Biological Control in the Experiment Station, Berkeley.
Hilgardia 29(2):81-101. DOI:10.3733/hilg.v29n02p081. October 1959.
Chemical and biological control are regarded as two main methods of suppressing insects and spider mites. These two methods are often thought of as alternatives in pest control. This is not necessarily so, for with adequate knowledge they can be made to augment one another.
Biological control is part of the permanent natural control of population density. Chemical controls involve only immediate and temporary decimation of localized populations and do not contribute to natural control. Natural control may keep a pest species from ever reaching the economic-injury level or it may permit economic outbreaks. The frequency of these pest outbreaks varies from a regular to an occasional occurrence depending upon the level of the general equilibrium position in relation to the economic injury level and the types of fluctuations about the general equilibrium position.
Integrated control combines and integrates biological and chemical controls. Chemical control is used as necessary and in a manner which is least disruptive to biological control. Integrated control may make use of naturally occurring biological control as well as modified or introduced biological control. Thought must be given to the biological control of not only the primary pest under consideration but also other potential pests.
Integrated control is most successful when sound economic thresholds have been established, rapid sampling methods have been devised, and selective insecticides are available. In some situations, the development of integrated control requires the augmentation of biological control through the introduction of additional natural enemies or modification of the environment.
Integrated control of the spotted alfalfa aphid has been achieved in California. Economic thresholds were established so that insecticides are applied only when damage is imminent. Native predators, introduced parasites, and entomogenous fungi now keep the spotted-alfalfa-aphid populations below the economic threshold for most of the year. When population counts in the individual field clearly demonstrate that a field is threatened, Systox is applied at low dosages. These chemical treatments give adequate control, but do not necessarily eradicate the aphids. Most of the predators and parasites survive and persist on the remaining aphids.
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Also in this issue:To keep in touch
Sixth in an agricultural research centennial series: Beef cattle research at the University of California
Control of lemon trunk sprouts
Grapevine propagatlon: Improved field budding of grapevines using a modified cut and plastic tape
Labor management for seasonal farmworkers
Newly recognized Dying Arm Disease of grapevines
Controlling sweet corn smut
Alfalfa: Effects of seeding rates and Rhizobium inoculations
Leafhopper—natural vector of citrus stubborn disease?
The integration of chemical and biological control of the spotted alfalfa aphid: Field experiments on the effects of insecticides
The integration of chemical and biological control of the spotted alfalfa aphid: Impact of commercial insecticide treatments