University of Florida scientists find brown dog ticks resistant to major pest control treatment

For several years the brown dog tick has been eluding homeowners and pest control professionals after treatment, leading many homeowners to drastic measures to get rid of the pests. After years of studying the brown dog tick (Rhipicephalus sanguineus), University of Florida entomologists are learning why some chemicals are no longer effective against the pest, and which ones still work.

In 2009, University of Florida entomologist Phil Kaufman received a USDA Southern Regional IPM grant to study whether the brown dog tick was developing resistance to permethrin and fipronil, the two major active ingredients in spot treatments for pets. Kaufman said that he would get calls from people whose houses were overrun with ticks after they tried unsuccessfully to get rid of them.

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Arkansas farmers seeing possible PPO-resistant pigweed

In Delta Farm Press

by Bob Scott, University of Arkansas Extension Weed Specialist

There is a scientific process that weed scientists go through before we declare a weed resistant to a given herbicide. It involves looking at the suspect weed in comparison to a known “non-resistant” biotype of the same weed, looking at various rates and making sure that the resistance is heritable. The heritable part is why we grow plants out for two seasons and make sure the progeny are just as resistant as the parents.

My research counterparts at the University of Arkansas Campus in Fayetteville are working on these tests right now for PPO-resistant Palmer pigweed in Arkansas. They are not quite done yet, although it is becoming very apparent in the field that it’s here and possibly in other Mid-South states.

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