Liriomyza Munda and Parasite Mortality from Insect Growth Regulators

  • Sidney L. Poe


Two insect growth regulators (IGR's), ZR-619 (ethyl n-methoxy-3,7,11-trimethyl-(2E, 4E)-2,4-dodecadienethiolate), and ZR-777 (Prop-2 ynyl 3,7,11-trimethyl-(2E, 4E)-dodecadienoate) were tested for control potential against a dipterous leafminer, Liriomyza munda Frick, by treatment of puparia and by treatment of soil where puparia form. Both IGR's separately and in combination suppressed adult emergence by 16-23% when puparia were treated and 10 to 14% when soil was treated. All treatments of IGR's reduced Opius parasite emergence to 0% from levels as high as 27%. Use of the IGR's in this manner was concluded to be of greater potential harm to biological control agents than benefit to leafminer control.
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