Over the weekend, Thomasville and most of Thomas County had more than half an inch of rain. We were checking peanuts last week, looking at 06G’s. We were seeing a little bit of tomato spotted wilt virus (above). The picture above shows the some of the classic, chlorotic ring characteristics of TSWV. It is not bad in the field, but we can expect to see some on even resistant varieties. No variety is immune.
The initial appearance of soilborne diseases such as white mold (below) is related to soil temperature, the growth of crop and rainfall/irrigation. White mold was seen less than TSWV in this field. Most peanuts have hit the 60 day mark where we generally begin spraying for soilborne diseases. Below is an update form UGA Extension Pathologist, Dr. Bob Kemerait:
Very warm weather and scattered thunder storms will increase risk of several important diseaes.
1. White mold: warm soils, increased growth of peanut crop, and rainfall have created ideal conditions for development and spread of this disease and fungicide programs should be implemented accordingly.
2. My graduate student Abraham Fulmer is finding development of early and late leaf spot in his unsprayed peanut plots. A further indication that it is time to spray.