Uri Gerson is at the Department of Entomology, Faculty of Agricultural, Food and Environmental Sciences, Hebrew University, Rehovot, Israel. Robert L. Smiley and Ronald Ochoa are at the Systematic Entomology Laboratory, US Department of Agriculture, Agricultural Research Service, Beltsville, MD, USA

• Introduction; History and current work; the Acari; Illustrated keys to ABA families; Treatment of individual families; Introduction, culture and establishment; Sex ratio of ABAs and its effect on mass-rearing, establishment and field performance; Influence of host plants and host pests on the efficacy of ABAs; Mutual interference between ABAs and natural enemies of ABAs; The effect of pesticides on ABAs; Acarine biocontrol agents as predators; Attributes of efficient ABAs and demonstrating their efficacy; Environmental constraints in the use of ABAs; Economics and commercial aspects; Recommendations for future work; References; Glossary.

Uri Gerson is at the Department of Entomology, Faculty of Agricultural, Food and Environmental Sciences, Hebrew University, Rehovot, Israel. Robert L. Smiley and Ronald Ochoa are at the Systematic Entomology Laboratory, US Department of Agriculture, Agricultural Research Service, Beltsville, MD, USA

• Introduction; History and current work; the Acari; Illustrated keys to ABA families; Treatment of individual families; Introduction, culture and establishment; Sex ratio of ABAs and its effect on mass-rearing, establishment and field performance; Influence of host plants and host pests on the efficacy of ABAs; Mutual interference between ABAs and natural enemies of ABAs; The effect of pesticides on ABAs; Acarine biocontrol agents as predators; Attributes of efficient ABAs and demonstrating their efficacy; Environmental constraints in the use of ABAs; Economics and commercial aspects; Recommendations for future work; References; Glossary.

Uri Gerson is at the Department of Entomology, Faculty of Agricultural, Food and Environmental Sciences, Hebrew University, Rehovot, Israel. Robert L. Smiley and Ronald Ochoa are at the Systematic Entomology Laboratory, US Department of Agriculture, Agricultural Research Service, Beltsville, MD, USA

• Introduction; History and current work; the Acari; Illustrated keys to ABA families; Treatment of individual families; Introduction, culture and establishment; Sex ratio of ABAs and its effect on mass-rearing, establishment and field performance; Influence of host plants and host pests on the efficacy of ABAs; Mutual interference between ABAs and natural enemies of ABAs; The effect of pesticides on ABAs; Acarine biocontrol agents as predators; Attributes of efficient ABAs and demonstrating their efficacy; Environmental constraints in the use of ABAs; Economics and commercial aspects; Recommendations for future work; References; Glossary.