Golf Course Management

JAN 2019

Golf Course Management magazine is dedicated to advancing the golf course superintendent profession and helping GCSAA members achieve career success.

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Page 118 of 211

01.19 GOLF COURSE MANAGEMENT 111 on insecticide resistance in ABW populations stems from product-efficacy testing trials (1). ese tests were not designed to truly under - stand how resistance affects insecticide ef- ficacy, and the resistance in test populations was inferred based on the performance of py - rethroids included among the treatments (1). erefore, the objectives of the present study were (1) to expand observations on insecticide resistance in ABW to the larval stage, (2) to confirm laboratory and greenhouse observa - tions on resistance in adults and larvae under field conditions, and (3) to examine the effect of pyrethroid-resistance level on the efficacy of important insecticides used for the manage - ment of adults and larvae. Insects Six ABW populations with different levels of pyrethroid resistance as determined in pre - vious studies with adults (2) were used. e population from Rutgers Horticultural Farm No. 2 (HF; North Brunswick, N.J.) had the lowest LD 50 value (lethal dose killing 50% of the test population) for bifenthrin in topical assays and was thus considered the most sus - ceptible population. Based on their resistance ratios (RR 50 ; ratio of LD 50 of test population to LD 50 of the most susceptible population), the other populations were categorized as sus - A fifth-instar larva (top) and an adult annual bluegrass weevil. Photos by B.A. McGraw

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