Seminole Crop E News

Agricultural News for Farmers and Agribusiness in SW Georgia

Plant Disease Update

Posted by romeethredge on April 16, 2013

 Dr. Bob Kemerait, UGA Extension Plant Pathologist Gives us this plant disease update.

Our weather may not be as cold as it was in Zac Brown’s song, but…. Our continued rains and cooler-than-usual temperatures for this time of year will have likely have a significant impact on seedling diseases and other diseases this year.

 

1.  COTTON:  Cooler and wetter soils will increase the risk to seedling diseases (Pythium and Rhizoctonia) as a) the fungal pathogens enjoy the moisture and will grow well and b) the cooler soils could make germination and early-season growth less vigorous allowing the pathogens to jump on the seedlings.  If current wet conditions continue, this is the kind of season when growers are most likely to see a benefit (improved stand and vigor) with use of additional fungicide seed treatments.

 

2. PEANUTS:  Cooler and wetter soils as planting increase the risk for seedling disease caused by Rhizoctonia but actually DECREASE the risk for Aspergillus crown rot which is most common in hot and dry soils.  OUR MOST IMPORTANT concern in peanut production with a cooler and wetter planting season is CYLINDROCLADIUM BLACK ROT (CBR).  We have not seen much of this disease in recent years because of our warm conditions at planting time, but if we stay cooler and wetter, growers should be prepared.  Counties I expect the most CBR in include Miller, Terrell, Randolph, Webster, Tift, Burke, Jefferson and Worth. CBR will occur in other counties as well and can be devastating in specific fields.  Our best tactic to manage CBR is to either fumigate with metam sodium or VAPAM or to make in in-furrow application of Proline at 5.7 fl oz/A.

 

3.  SOYBEANS:  We know that some kudzu successfully overwintered in lower Alabama and last week we found soybean rust on kudzu that survived in Miller County.  Current wet-weather will likely help to spread the disease to kudzu that is now rapidly emerging.  If these conditions continue, 2013 could be our biggest year yet for soybean rust…. Remember that fungicide application at late bloom-early pod set…\

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