Containerized Crapemyrtle Bark Scale Trial

Containerized Crapemyrtle Bark Scale Trial

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In Overton, Texas, we’re about done tying up crapemyrtles, getting them on drip irrigation, and starting pre-assessments. We have a total of 100 standard (Queen’s Lace) and 100 dwarf (Pocomoke) cultivars, all highly infested with crapemyrtle bark scale, for our research trial. Before deciding what insecticides and timing of applications we would try, we had to summarize some of our past results. All of our past work on crapemyrtle bark scale insecticide trials are available through Arthropod Management Tests ( and search for “crapemyrtle bark scale”). If you’re feeling a bit intimidated by the papers in Arthropod Management Tests, I made a short video tutorial walking through some of the jargon used in insecticide efficacy work. The following table is based on data from our Overton Center:

Producta.i.MoAApplication MethodFrequencyEfficacy
Talstar + SafariBifenthrin + Dinotefuran3A + 4ABark Spray + Drench2 & 1Great
SafariDinotefuran4ABark Spray1Good
FulcrumPyriproxyfen7CBark Spray2Good
TalusBuprofezin16Bark Spray2Good
AltusFlupyradifurone4DBark Spray2Moderate
MalletImidacloprid4ADrench1Moderate - Good
Grandevo & VenerateChromobacterium subtsugae strain PRAA4-1 & Burkholderia spp. strain A396N/ABark Spray2 & 2Poor
AceleprynChlorantraniliprole28Bark Spray2Poor
AzaGuardAzadirachtinUNBark Spray2Poor
AcephateAcephate1BBark Spray2Poor
SuffOil-X + Molt-XMineral oil + AzadirachtinUNE + UNBark Spray2Poor
VeliferBeauveria bassiana PPRI 5339UNFBark Spray2In Progress
XxpireSpinetoram & Sulfoxaflor5 + 4CBark Spray2In Progress
VentigraAfidopyropen9DBark Spray2In Progress
PradiaCyclaniliprole + Flonicamid28 + 29Bark Spray2Inconclusive
SarisaCyclaniliprole28Bark Spray2Inconclusive

Table last update July 8, 2020.

We’re going to be testing some of the products that were considered “inconclusive” in our past trials, due to the untreated check having highly variable numbers of crapemyrtle bark scale, as well as test different timing of insecticide applications. I’ll provide updates here and on my social media (sixleggedaggie) as we move forward with the trial. I have posted a video about our trial as well, in case you’d like to learn more about he design and evaluation in our insecticide trials.

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