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California Agriculture, Vol. 59, No.1

Beyond organophosphates
Cover:  Under the Food Quality Protection Act of 1996, many uses of organophosphate insecticides and other broad-spectrum pesticides are being phased out, with important implications for California growers; UC scientists are exploring a range of alternatives. Shown on this home gardener’s shelf are generations of pesticides, some of which have been banned or their uses curtailed. Photo: Galen Rowell/Corbis
January-March 2005
Volume 59, Number 1

Peer-reviewed research and review articles

Food Quality Protection Act launches search for pest management alternatives
by Robert A. Van Steenwyk
| Full text HTML  | PDF  
Organophosphate insecticides have allowed large yield increases, but under the FQPA many will be cancelled. Alternatives are needed to maintain a viable state agricultural industry.
Insecticides have long been important tools for California farmers to combat agricultural pests. By 1995, organophosphate (OP) insecticides such as chlorpyrifos, azinphos-methyl, methamidophos, phosmet and diazinon accounted for an estimated 34% of worldwide insecticide sales, and they are widely credited with allowing large yield increases in commercial agriculture. The U.S. Food Quality Protection Act (FQPA), signed into law in 1996, established a new human health-based standard that “reasonable certainty of no harm will result from aggregate exposure to the pesticide chemical residue.” When the FQPA was passed, 49 OP pesticides were registered for use in pest control in the United States; since then, many uses have been canceled and others are expected to be lost, with particular significance for California growers. A number of alternative pest-control products and strategies are available, with varying degrees of effectiveness and cost. Research and development of control measures to replace OP insecticides must be pursued to maintain an economically viable state agricultural industry.
Managing resistance is critical to future use of pyrethroids and neonicotinoids
by Frank G. Zalom, Nick C. Toscano, Frank J. Byrne
| Full text HTML  | PDF  
Pyrethroids and neonicotinoids have become important replacements for organophosphates, but resistance and nontarget impacts have been already identified.
Synthetic pyrethroids and neonicotinoids are the most readily available alternatives to the organophosphate and carbamate insecticides. Pyrethroids have become widely used in California, and problems with insecticide resistance and nontarget impacts have already been identified. Neonicotinoids are a new class of insecticide with uses only now being realized. Managing insecticide resistance will be crucial to preserving these new materials as organophosphate uses are lost.
Pheromone mating disruption offers selective management options for key pests
by Stephen C. Welter, Carolyn Pickel, Jocelyn Millar, Frances Cave, Robert A. Van Steenwyk, John Dunley
| Full text HTML  | PDF  
Mating disruption can control insects; new pheromone-dispersal technologies are more effective, but insecticides are sometimes still necessary.
The direct management of insect pests using pheromones for mating disruption, or “attract and kill” approaches, can provide excellent suppression of key lepidopteran pests in agriculture. Important successes to date include codling moth in pome fruit, oriental fruit moth in peaches and nectarines, tomato pinworm in vegetables, pink bollworm in cotton and omnivorous leafroller in vineyards. Large-scale implementation projects have yielded significant reductions in pesticide use while maintaining acceptably low crop-damage levels. Because of some difficulties with high populations of pests, these programs should not be viewed as stand-alone strategies but rather as one tactic within a suite of integrated pest management options.
Biological and cultural controls … Nonpesticide alternatives can suppress crop pests
by Nicholas J Mills, Kent M Daane
| Full text HTML  | PDF  
Natural enemies of pests play an important role in preventing crop damage; cultural practices can also reduce the susceptibility of a crop to pests.
Biological controls (the use of natural enemies) and cultural controls (the modification of cropping practices) provide valuable alternatives to organophosphate insecticides (OPs) for the suppression of major arthropod crop pests in California. We discuss the successes and limitations of these two approaches with regard to tree fruits and nuts, vines, and field and row crops. For example, a historic success story is that the cottony cushion scale remains innocuous in citrus production, more than 100 years after its successful suppression by the vedalia beetle. More recently, growers’ use of groundcovers and road maintenance helps keep dust down on orchard roads to limit the buildup of web-spinning mites, and good vineyard management is now synonymous with cultural controls for grape pests. Although such alternatives may not always be as effective and predictable as conventional insecticide programs, recognition that partial suppression can greatly reduce the need for OPs will lead to the more widespread adoption of alternatives.
Various novel insecticides are less toxic to humans, more specific to key pests
by Elizabeth E Grafton-Cardwell, Larry D Godfrey, William E Chaney, Walter J Bentley
| Full text HTML  | PDF  
A number of newly registered insecticides have low mammalian toxicity and target specific crop pests; however, resistance and secondary pest outbreaks must be managed.
A number of novel insecticides have recently been registered for insect control in agriculture. A major advantage of these new products is that they act on insect biological processes that humans do not experience, such as molting. Many also have greater selectivity to target specific species, so they are less likely to harm natural enemies when compared with the broader spectrum organophosphate, carbamate, neonicotinoid and pyrethroid insecticides. Such novel insecticides currently in use include four targeting lepidopteran pests, three targeting sucking insects, one specific to dipteran leafminers and one insect growth regulator that controls a wide range of insects. One negative aspect of these insecticides is that because of their narrower range of activity — controlling only a limited number of pests — growers may need to apply additional pesticides for secondary pest groups that have poor biological control, increasing the total number of treatments per acre and total pest-control costs.
Microorganisms and their byproducts, nematodes, oils and particle films have important agricultural uses
by Larry D Godfrey, Elizabeth E Grafton-Cardwell, Harry K Kaya, William E Chaney
| Full text HTML  | PDF  
Insect pathogens are potentially effective, but their commercial use — except Bt — has been limited; metabolic compounds from microorganisms and oils are widely used in pest control.
The insect and mite control potential of natural and biological toxins has been recognized for several centuries. Bacteria, viruses, protozoa and fungi are the primary groups of microorganisms known to reduce insect populations; they often occur naturally in fields and function as components of biological control. Beneficial nematodes are also being used for pest control, especially against soil insects. The isolation of toxic metabolic compounds from microorganisms continues to be a fruitful research area, although there are barriers to their successful marketing and distribution. Another, more controversial way to deliver these insect-specific toxins to the target pest is through genetically modified plants, such as those modified to express Bacillus thuringiensis (Bt) toxins. Oils and particle films also have important niche uses for pest control.
Costs of 2001 methyl bromide rules estimated for California strawberry industry
by Colin A Carter, James A Chalfant, Rachael E Goodhue, Gregory J McKee
| Full text HTML  | PDF  
Methyl bromide use restrictions cost strawberry growers an estimated $26 million in 2001, with costs borne unevenly among counties and different-size growers.
The California Department of Pesticide Regulation (DPR) restricts pesticide use to reduce negative impacts on human health and the environment. The DPR implemented methyl bromide use regulations in 2001. Our study demonstrates that the estimated 2001 costs of these regulations for the California strawberry industry were quite substantial (more than $26 million total), equivalent to roughly 25% of estimated industry returns over total cash costs in 2001. These impacts were unevenly distributed across growers. Growers with small fields in urban areas had higher per-acre costs than growers with large fields in agricultural areas.

Editorial, News, Letters and Science Briefs

Environmental laws elicit evolution in pest management
by Robert Van Steenwyk, Frank G. Zalom
Full text HTML  | PDF  
Letters: January-March 2005
From our readers
Full text HTML  | PDF  
Science briefs: January-March 2005
by Robin Meadows
Full text HTML  | PDF  
Webmaster Email: wsuckow@ucanr.edu

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California Agriculture, Vol. 59, No.1

Beyond organophosphates
Cover:  Under the Food Quality Protection Act of 1996, many uses of organophosphate insecticides and other broad-spectrum pesticides are being phased out, with important implications for California growers; UC scientists are exploring a range of alternatives. Shown on this home gardener’s shelf are generations of pesticides, some of which have been banned or their uses curtailed. Photo: Galen Rowell/Corbis
January-March 2005
Volume 59, Number 1

Peer-reviewed research and review articles

Food Quality Protection Act launches search for pest management alternatives
by Robert A. Van Steenwyk
| Full text HTML  | PDF  
Organophosphate insecticides have allowed large yield increases, but under the FQPA many will be cancelled. Alternatives are needed to maintain a viable state agricultural industry.
Insecticides have long been important tools for California farmers to combat agricultural pests. By 1995, organophosphate (OP) insecticides such as chlorpyrifos, azinphos-methyl, methamidophos, phosmet and diazinon accounted for an estimated 34% of worldwide insecticide sales, and they are widely credited with allowing large yield increases in commercial agriculture. The U.S. Food Quality Protection Act (FQPA), signed into law in 1996, established a new human health-based standard that “reasonable certainty of no harm will result from aggregate exposure to the pesticide chemical residue.” When the FQPA was passed, 49 OP pesticides were registered for use in pest control in the United States; since then, many uses have been canceled and others are expected to be lost, with particular significance for California growers. A number of alternative pest-control products and strategies are available, with varying degrees of effectiveness and cost. Research and development of control measures to replace OP insecticides must be pursued to maintain an economically viable state agricultural industry.
Managing resistance is critical to future use of pyrethroids and neonicotinoids
by Frank G. Zalom, Nick C. Toscano, Frank J. Byrne
| Full text HTML  | PDF  
Pyrethroids and neonicotinoids have become important replacements for organophosphates, but resistance and nontarget impacts have been already identified.
Synthetic pyrethroids and neonicotinoids are the most readily available alternatives to the organophosphate and carbamate insecticides. Pyrethroids have become widely used in California, and problems with insecticide resistance and nontarget impacts have already been identified. Neonicotinoids are a new class of insecticide with uses only now being realized. Managing insecticide resistance will be crucial to preserving these new materials as organophosphate uses are lost.
Pheromone mating disruption offers selective management options for key pests
by Stephen C. Welter, Carolyn Pickel, Jocelyn Millar, Frances Cave, Robert A. Van Steenwyk, John Dunley
| Full text HTML  | PDF  
Mating disruption can control insects; new pheromone-dispersal technologies are more effective, but insecticides are sometimes still necessary.
The direct management of insect pests using pheromones for mating disruption, or “attract and kill” approaches, can provide excellent suppression of key lepidopteran pests in agriculture. Important successes to date include codling moth in pome fruit, oriental fruit moth in peaches and nectarines, tomato pinworm in vegetables, pink bollworm in cotton and omnivorous leafroller in vineyards. Large-scale implementation projects have yielded significant reductions in pesticide use while maintaining acceptably low crop-damage levels. Because of some difficulties with high populations of pests, these programs should not be viewed as stand-alone strategies but rather as one tactic within a suite of integrated pest management options.
Biological and cultural controls … Nonpesticide alternatives can suppress crop pests
by Nicholas J Mills, Kent M Daane
| Full text HTML  | PDF  
Natural enemies of pests play an important role in preventing crop damage; cultural practices can also reduce the susceptibility of a crop to pests.
Biological controls (the use of natural enemies) and cultural controls (the modification of cropping practices) provide valuable alternatives to organophosphate insecticides (OPs) for the suppression of major arthropod crop pests in California. We discuss the successes and limitations of these two approaches with regard to tree fruits and nuts, vines, and field and row crops. For example, a historic success story is that the cottony cushion scale remains innocuous in citrus production, more than 100 years after its successful suppression by the vedalia beetle. More recently, growers’ use of groundcovers and road maintenance helps keep dust down on orchard roads to limit the buildup of web-spinning mites, and good vineyard management is now synonymous with cultural controls for grape pests. Although such alternatives may not always be as effective and predictable as conventional insecticide programs, recognition that partial suppression can greatly reduce the need for OPs will lead to the more widespread adoption of alternatives.
Various novel insecticides are less toxic to humans, more specific to key pests
by Elizabeth E Grafton-Cardwell, Larry D Godfrey, William E Chaney, Walter J Bentley
| Full text HTML  | PDF  
A number of newly registered insecticides have low mammalian toxicity and target specific crop pests; however, resistance and secondary pest outbreaks must be managed.
A number of novel insecticides have recently been registered for insect control in agriculture. A major advantage of these new products is that they act on insect biological processes that humans do not experience, such as molting. Many also have greater selectivity to target specific species, so they are less likely to harm natural enemies when compared with the broader spectrum organophosphate, carbamate, neonicotinoid and pyrethroid insecticides. Such novel insecticides currently in use include four targeting lepidopteran pests, three targeting sucking insects, one specific to dipteran leafminers and one insect growth regulator that controls a wide range of insects. One negative aspect of these insecticides is that because of their narrower range of activity — controlling only a limited number of pests — growers may need to apply additional pesticides for secondary pest groups that have poor biological control, increasing the total number of treatments per acre and total pest-control costs.
Microorganisms and their byproducts, nematodes, oils and particle films have important agricultural uses
by Larry D Godfrey, Elizabeth E Grafton-Cardwell, Harry K Kaya, William E Chaney
| Full text HTML  | PDF  
Insect pathogens are potentially effective, but their commercial use — except Bt — has been limited; metabolic compounds from microorganisms and oils are widely used in pest control.
The insect and mite control potential of natural and biological toxins has been recognized for several centuries. Bacteria, viruses, protozoa and fungi are the primary groups of microorganisms known to reduce insect populations; they often occur naturally in fields and function as components of biological control. Beneficial nematodes are also being used for pest control, especially against soil insects. The isolation of toxic metabolic compounds from microorganisms continues to be a fruitful research area, although there are barriers to their successful marketing and distribution. Another, more controversial way to deliver these insect-specific toxins to the target pest is through genetically modified plants, such as those modified to express Bacillus thuringiensis (Bt) toxins. Oils and particle films also have important niche uses for pest control.
Costs of 2001 methyl bromide rules estimated for California strawberry industry
by Colin A Carter, James A Chalfant, Rachael E Goodhue, Gregory J McKee
| Full text HTML  | PDF  
Methyl bromide use restrictions cost strawberry growers an estimated $26 million in 2001, with costs borne unevenly among counties and different-size growers.
The California Department of Pesticide Regulation (DPR) restricts pesticide use to reduce negative impacts on human health and the environment. The DPR implemented methyl bromide use regulations in 2001. Our study demonstrates that the estimated 2001 costs of these regulations for the California strawberry industry were quite substantial (more than $26 million total), equivalent to roughly 25% of estimated industry returns over total cash costs in 2001. These impacts were unevenly distributed across growers. Growers with small fields in urban areas had higher per-acre costs than growers with large fields in agricultural areas.

Editorial, News, Letters and Science Briefs

Environmental laws elicit evolution in pest management
by Robert Van Steenwyk, Frank G. Zalom
Full text HTML  | PDF  
Letters: January-March 2005
From our readers
Full text HTML  | PDF  
Science briefs: January-March 2005
by Robin Meadows
Full text HTML  | PDF  

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