Wheat Update

These photos were taken today (4/19/15) south of Blountstown, Fl.  I have never seen a field so completely covered with rust and septoria. This could happen to your fields if you did not spray on time. At first I thought Wheat Take All, but this is the first I have seen wheat in this field. It was following peanuts. This field has had rain for several days straight.

Diseased  wheat in FlaDiseased wheat fla 04-19-15

You need to spray as late as possible per the label of fungicide used, because most fungicides do not translocate well in the plant. We need to protect the head of wheat and the flag leaf during this time.   If you see rust call me. I have seen very little rust but lots of Septoria, Stagonnospora leaf blotch, Powerdery mildew, BYD and Tan Spot.

Fungicides

Absolute 500 SC, Headline , Stratego, Quilt, Quadris, Folicur+Tilt , or one of many others.  All should be put out at per the label of fungicide used.

Aphids are out , but you need to have 10+ per flag leaf before you treat. Always watch for beneficials. Lady bugs, Aphid lions (lady bug larvae), parasitic wasp, and syrphid fly larvae all eat aphids.

Foliar insecticide treatments for aphid control: A well-timed insecticide application of a persistent pyrethroid insecticide such as lambda cyhalothrin (Warrior, Karate, Lambda, Silencer, others) can reduce the incidence of BYD and increase yields.  Lambda cyhalothrin can only be applied twice to a crop so use another product at heading such as Baythroid XL or Mustang MAX/Respect.  These can be combined with a foliar fungicide application and also will control cereal leaf beetle if it is present.

Always follow all label instructions.

Good Growing!

*Follow label on all Pesticides, rinse and dispose of empties properly. Info Georgia Pest Management Handbook 2015

Rust, Stem, Stripe , or Leaf. Do you have it?

Most new southern varieties are Rust resistant.

Now we have that out of the way – what is in your field?

Compare the wheat you planted against the UGA 2014 wheat chart. This resource will help you in determining what could be in your wheat.

Rust. Please check using a white cloth to see if you can rub off any spores. The colors to look for are red/brown, yellow, orange, or any combination. (See LSU chart below.) Wait two days after a rain to do this as rain will wash off the spores. Rust is very aggressive when the temperatures are right and must be controlled quickly. Do not allow many days to pass before you check your fields. Call me if you find Rust on a AGS variety. 

Stripe Rust, LSU

Stripe Rust, vis LSU

Powdery Mildew and BYD (Barley Yellow Dwarf). Look for white to gray powdery fungal growth on leaves and leaf sheaths. Tip yellowing, purple leaves, and/or twisting of leaves are symptoms of BYD, which is a virus, and fungicides will not control it. You must put something out to control aphids before you get the virus. See LSU info on BYD below.

BYD (Barley Yellow Dwarf, LSU)

BYD (Barley Yellow Dwarf)

Cold/Frost Damage. You could just have cold/frost damaged wheat. The conditions have been right cold-frost damage, and some early planted field have it.  Yellowing, streaking, tip burn,  and purple tips are caused by frost/cold damage.

Manganese Deficiency. Manganese is another problem in fields with HIGH Ph. The photo is of a confirmed manganese deficient field.

Manganese Deficient field.

Manganese Deficient field.

I generally find the flag leaf to be the one of the things I want to protect, along with the wheat head. Leaf Blotch, Fusarium, and Glume Blotch must be controlled to have good wheat yields. Fungicides do not trans-locate well and need to be on the surface they are to protect. Please wait as long as possible or if you must spray early then plan to spray twice.

Tissue test your flag leaf. Do not get the largest tiller in each plant, as it will get the first choice of N and give you a skewed reading. I prefer to ample from one of the smaller tillers because that is where your yield will be increased. These smaller /later tillers will dry-up if you do not have proper fertilization.

Good Growing!

*Information obtained from 2015 Georgia Pest Control Handbook (http//www.caes.uga.edu/publications) , Intensive Wheat Management in Georgia, and LSU. As always, follow label and dispose of empties properly.

Wheat Update: powdery mildew, leaf blotch & aphids

Powdery mildew, Leaf blotch and Aphids are causing problems on wheat this week.. The 80 degree days and nights around 58 degrees will really allow diseases to infect this wheat crop.

The photo above shows mildew and possible leaf blotch (Morris Henry). It is a good example of what you could see in your fields this week. Also you can see the effects of early heading caused by the extremely warm weather after enough cold hours have been acquired by the wheat crop.  Propiconazole or Tebuconazole at the low rate should cure your mildew and leaf blotch problems.  Do not spray your primary fungicide until the wheat heads, around Feekes 10.4 is best.

The aphid photo (above) is a good example of what you found last week in your fields and shows a colony growing and getting ready to fly to another area in your field spreading Barley Yellow Dwarf which can hurt your yield. A lambda insecticide will cure that problem.

Click here for the UGA charts on pesticide and fungicide sprays and rates.

Good Growing!

Information obtained from 2012(http//www.caes.uga.edu/publications) Georgia Pest Control Handbook and Intensive Wheat Management in Georgia.  As always follow label and dispose of empties properly.