1. Shetlar Turfgrass Entomology “Effort(s)” David J. Shetlar (the BugDoc) Associate Professor of Entomology The Ohio State University Columbus, OH

2. Ranked Efficacy of White Grub Insecticides 1976 – 2005 a – rateaverange% of tests Insecticidelb.ai./a.% control# tests% controlbelow 70% Carbaryl8.072.84313-10040 (=Sevin) Chlorpyrifos 4.0 54.6 32 0-9659 (=Dursban) Permethrin 0.26 31.8 8 0-54100 Trichlorfon 8.0 77.6 910-9819 (=Dylox, Proxol) a Data from ESA publications (1977-2005) & Ohio testing using masked chafer and Japanese beetle data where label timing recommendations were used and at least 4.0 grubs per sq.ft. were found in checks. (D. Shetlar) Clothianidin 0.3 99.5 499-1000 (=Arena) 0.25 94.7 390-1000 Halofenozide 1.5 91.2 6510-10012 (=MACH2) 2.0 89.6 5356-1009 Imidacloprid 0.3 94.1 8858-100 6 (=Merit) 0.4 94.1 782-1000

3. Comparison of Grub Insecticide Efficacy by Time of Application Halofenozide1.588.5 (8)94.4 (23)88.8 (21)89.6 (19) 77.7 (27) (=MACH2)2.080.5 (4)63.7 (9)93.8 (12)75.0 (5) --- Imidachloprid0.374.4 (12)91.3 (27)94.7 (39)93.6 (29) 94.1 (35) (=Merit)0.462.0 (1)88.0 (1)89.0 (1)82.0 (1) --- Clothianidin0.25100.0 (1)90.0 (1)97.0 (2) --- --- (=Arena)0.393.0 (1)100.0 (2)99.0 (2) --- 97.0 (1) Trichlorfon8.0---------62.2 (5) 77.7 (19) rate ave % control (#tests) Insecticidelb.ai./a.MayJuneJulyto Aug 16to Sept 10 a Data from ESA publications (1977-2005) & Ohio testing using masked chafer and Japanese beetle data where label timing recommendations were used and at least 4.0 grubs per sq.ft. were found in checks. D. Shetlar