Statewide soil sampling survey will help growers make decisions on what soybean cultivar to plant in fields with Phytophthora stem and root rot.
The recent, heavy rain events are likely to bring on Phytophthora root and stem rot symptoms (see images). In an effort to improve Phytophthora root and stem rot management, we are conducting a survey to identify races (pathotypes) of Phytophthora sojae.
If you would like to submit a soil sample, please include:
One gallon of soil sampled from at least 10 different parts of a field known to have a history of Phytophthora root and stem rot.
GPS coordinates of the field so we can map where each sample came from, or the nearest road intersection. (We recommend using Google maps to obtain GPS points in the field.)
The date you collected the soil.
Any information you can give us on field practices used, i.e., tillage practices, irrigation, previous crop planted, etc.