Thrips and Valor Injury Anco Clemson Peanut Notes No. 66 2020
Comments from Dan Anco, Clemson University
Attached are images of thrips injury and valor injury. Depending on the size of the peanuts if small they might look a little similar in that they both can produce dead/dying tissue. Thrips injury is usually more prominent on the younger growing leaf terminals; these can turn necrotic black when feeding is severe. As leaves grow out of older injury, the scarring often will turn from yellow/white to tan (scar tissue). Expanding leaves with increased thrips injury can look wrinkled as well – this would usually be accompanied with many thrips feeding pin-pricks that can coalesce.
Valor injury can look a little variable at times. It is more common following splashing rain as peanuts are emerging, particularly if it has not rained since the Valor was applied. It can look like a lot of burn damage at times but generally this doesn’t reduce yields. Regrowth can appear stunted and somewhat misshapen at first, but the peanuts typically recover well. More sun looks to be in the forecast for the week ahead to help with this.
Extension Peanut Specialist and Assistant Professor
Department of Plant and Environmental Sciences
Clemson University – Edisto Research and Education Center
64 Research Road
Blackville, SC 29817
803-284-3343 x261 office