The weather conditions that we have had the last week and the conditions forecasted for the next few days were/are PERFECT for the development of diseases. The rainfall scattered throughout the day cause our leaf wetness period to be much longer and the heavy rainfall and winds associated with these storms spreads fungal spores. Not only does this weather promote development of diseases, but it keeps us from being able to apply the fungicides needed to protect the crops as well. The following is a list of row crop diseases that growers should be concerned about now:
1) White Mold and Rhizoctonia Limb Rot- warm conditions and plenty of moisture will promote the development of these diseases. Growers should start early, be on time, and use effective products for the management of soilborne peanut diseases for the best results.
2) Leaf Spot Diseases- Growers should be prepared for leaf spot diseases. The most important points for leaf spot control is to stay on schedule with your fungicide applications and use products that are not only effective on leaf spots but have good systemic capabilities as well.
** A note on Peanut Rx– Growers that are using Peanut Rx should be more conservative in the “reduced risk” situations than they originally planned. The weather conditions are simply increasing the risk for the development of disease across ALL FIELDS.
1) Soybean Rust- This disease is present in Georgia and the storms will most certainly aid in the spread of this disease. Growers should consider protecting their beans with a fungicide somewhere between late bloom and early pod stage.
1) Southern Corn Rust- Growers need to be protecting their corn from Corn Rust from early tassel through at least the late dough stage. The disease is not exploding in the area right now, but it could become a problem at anytime.
2) Northern and Southern Corn Leaf Blights- These diseases are present in many of the corn fields in the area and can be a problem depending on the amount of disease present and the age of the corn. Growers should make decisions on this disease on a field-by-field basis.
1) Target Spot- growers should be on the look out for target spot developing in their cotton due to the long leaf wetness periods that we have been seeing lately. Research suggests that the best time to make a single application of a fungicide for target spot is around the third week of bloom. The best control however was seen when a fungicide was applied at both the first and third weeks of bloom. Timing is critical for this disease as the application must be made before the crop canopy prevents good coverage of the fungicide.
Bottom Line, growers should be looking for row crop diseases to develop (promoted by the passing weather) and stay as “on-time” as possible when it comes to protecting their crop. If you have any questions feel free to give Brock, Jay, or myself a call.