Undergraduate Thesis Or Project
 

Monitoring Onion Thrips Response to Insecticide Agri-Mek SC in the Treasure Valley of Eastern Oregon and Western Idaho

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  • Onion thrips (Thrips tabaci) are pests found in onion fields of the Treasure Valley, which is located in Eastern Oregon and Western Idaho. Thrips cause damage to this high value crop by feeding on the onion’s extracellular fluid, making photosynthesis more difficult to occur. The feeding from the thrips can reduce the size of onion bulbs and can lead to infection and transmission of the Iris Yellow Spot Virus (IYSV). Currently the best practice is to use insecticides to manage thrips. However, because thrips reproduce by parthenogenesis, they rapidly develop insecticide resistance, negating onion growers' efforts. The goal of this research is to determine if the insecticide Agri-Mek SC is effective even after the recommended re-entry period of when each were sprayed; if so, are growers overspraying? The recommended re-entry period for the Ari-Mek insecticide is 24hrs. In order to investigate this, bioassays of 10 onion thrips were put into 5 distinct insecticide concentrations and had eight replicates for Agri-Mek SC, including the controls. After the recommended re-entry period was complete, each replicate was analyzed for the mortality of thrips. After an additional 24hrs, bioassays were analyzed once more. The data were analyzed using the software SAS. The results showed Agri-Mek, with the active ingredient of abamectin, was still toxic at the 48hr. time period. This indicates the insecticide Agri-Mek to be a slower acting insecticide; this should be taken into account when wanting to reapply insecticides. This research provides growers with insight on how the insecticide is performing and can further assist in the management of thrips in onion fields of the Treasure Valley without having to overuse insecticides.
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  • This research was funded by the USDA Higher Education Multicultural Scholars Program.
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