1. Peanut Diseases & Insects SCSC 306: Grain, Fiber, & Oilseed Crops Wayne Smith Professor, Cotton Breeding Office: (979) 845-3450 Email: cwsmith@tamu.educwsmith@tamu.edu

2. OSU Extension SCSC 306: Peanut Diseases

3. OSU Extension SCSC 306: Peanut Diseases

4. Number of “rots” affect peanuts. Limb rot is an example. Control of all of the “rots” are similar as shown below. OSU Extension photo/comments SCSC 306: Peanut Diseases

6. Photo: courtesy of OSU Coop. Ext. Service SCSC 306: Peanut Diseases Root-knot nematodes can be effectively controlled with crop rotation; However, root-lesion nematodes are more Difficult to control. Crop rotation has not been effective in reducing levels of this species because it has a wide host range and can reproduce on most rotational crops.

7. Leaf spots, caused by Cercospora or Cercosporidium fungi, are the most common and serious diseases of peanut. Control is by field sanitation and fungicides. (see next slide) [Photos from OSU Cooperative Extension] SCSC 306: Peanut Diseases Leaf Spots

8. Early and Late Leafspots in peanut (slide 2) SCSC 306: Peanut Diseases

9. OSU Cooperative Extension SCSC 306: Peanut Diseases

10. Scerotinia Blight is probably the most serious disease of peanut in Texas Photos: OSU Extension SCSC 306: Peanut Diseases

12. PSV is seed borne and aphid transmitted; Control is by avoiding seed not certified to be PSV free; no chemical nor host plant resistance (chemical control of aphid may help) OSU Coop. Ext. SCSC 306: Peanut Diseases

13. Spread is vectored by thrips and thus control of thrips with insecticide may be mandated; not transmitted through seed. Photos: OSU Extension SCSC 306: Peanut Diseases