Has Palmer amaranth evolved dicamba resistance in Tennessee? Results from some of the greenhouse experiments this winter and spring as well as in field research this growing season would suggest that our state now has dicamba-resistant (DR) Palmer amaranth. These DR populations are established in Crockett, Gibson, Madison, Shelby, and Warren counties and likely several others. Continue reading
This past week samples from Chester, Lauderdale, and Montgomery Counties in Tennessee were confirmed to have southern corn rust, so the question is do you need to put out a fungicide application… Continue reading
As soybean fields are blooming, disease scouting needs to start to guide fungicide application decisions. Continue reading
Please see the authorization letter linked below which allows the use of Sivanto (flupyradifurone) for control of sugarcane aphids in sweet sorghum. This product is already registered for use in grain sorghum. The authorization letter lists restrictions for the use of this product. Thanks to the EPA for once again granting this section 18 exemption.
20TN01 – Sivanto signed authorization letter
Follow the link below to experience the 2020 Milan No-till Field Day at your own pace! You can watch an entire tour by clicking on its name, or just one presentation by clicking on a specific title.
Please note, all links will open in a new tab. Closed captions are available by clicking the “CC” button on the right side of the video’s play bar.
https://milannotill.tennessee.edu/research-tours/
Cotton – Although plant bug populations remain lighter that usual, we are now seeing treatment levels in many fields. It’s time to switch to the drop cloth for best results. The treatment threshold for tarnished plant bug beginning at first flower is 3 tarnished plant bugs per drop cloth. You should maintain this threshold until about NAWF5+250 DD60s, at which time Continue reading
While May brought a great deal of rain, June and July have been dry for much of West Tennessee. We are already beginning to see the impacts on cotton growth and development. While we still have very good cotton yield potential, we need a good soaking rain in the coming weeks. This blog highlights impacts of drought on cotton during the growth stage, provides general information on scheduling irrigation and highlights a few scheduling methods.
Ideally, the soil profile needs to provide sufficient plant available water throughout the blooming period. As we begin to move towards the permanent wilting point during the blooming window, fruit retention may begin to decline and maturity may be delayed. If a rainfall or irrigation event does not ameliorate the stress, yield penalties may develop. Cotton plants are particularly susceptible to drought during the early boll development stages which immediately follow flowering (Table 1). Keeping soil profile at or near field capacity at early bloom through peak bloom will support earliness and maximize yields.
Although pressure is currently below average, it is increasing, which is to be expected as we enter the early blooming window. We have limited but good options to control plant bugs in blooming cotton. I often tell folks that if you call me once bloom starts, I’ll often only mention 4-5 products, sometimes in combination. Those include Acephate/Orthene, Diamond, Transform, and Bidrin. Vydate also gets and honorable mention. These are the core products suggested for mid-season plant bug control. Below are some treatment options I like, in no particular order. However, Continue reading