Friday, September 4, 2015

Who will be the first to document 100 bu/A soybeans in KY?

Carrie KnottExtension Agronomist-Princeton, University of Kentucky

Beginning this year there are two new awards for the Kentucky Soybean Production Contest: Kentucky 100-Bushel Club and Kentucky Double-Crop 80-Bushel Club.

Thursday, September 3, 2015

Armyworm Moth Captures are Abnormally Large.

Doug Johnson, Extension Entomologist, University of Kentucky

Armyworm moth.
Recent moth flight of armyworm (AW), in western Kentucky has been much larger than is normal for this time of year. It is not terribly unusual to see problems with this insect on pasture and forage grasses in late June and July, especially in central Kentucky This year’s much larger AW flight during late July and August in western Kentucky is truly unusual. It is difficult to know what to make of this because it has no precedence in our data set. Nevertheless, the fact is they are here.

Generally, I would expect to be looking for fall armyworm (FAW), Spodoptera fugiperda,at this time of year, but our moth captures for this insect in both central and western KY have been quite low, perhaps because the cold winter and spring pushed their overwintering locations farther south, and/or they were later beginning their annual northward migration. Even so we have seen some localized but significant populations in south-central KY.

  The data we see on the armyworm moth flight of course, describes the movement of adults, which are not the damaging stages. It is the juvenile, caterpillar stage that will appear in September that might pose the threat. Moth flights in the earlier portion of the season followed a relatively normal pattern. Our most common problem with AW comes in May on small grains and that is what we saw this year. Also, there is often a small bump in flight in June and July that usually doesn’t amount to much. Those events were relatively normal this year. What is different this year is that following that relatively normal flight in June and July we have another and much larger flight in July and August that will produce caterpillars in September.

Armyworm Caterpillar
AW has a very broad host range; it eats on many plants but really prefers grasses. On the whole, corn and grain sorghum should be too close to maturity for much damage. However, late planted soybeans and forage crops, most especially newly seeded forage crops could be in some danger.

Producers are advised to keep an eye on very late planted / late developing soybeans, along with forage crops, particularly grasses and most especially newly planted grasses, and grass-alfalfa mixes. There is no established threshold for this pest in these circumstances, but populations around 4-6 worms per sq.ft. probably require treatment.

Monday, August 31, 2015

Palmer Amaranth and Waterhemp Continues to Expand Across Kentucky

JD Green and Jim Martin, Extension Weed Scientists, University of Kentucky

Glyphosate-resistant Palmer amaranth (Amaranthus palmeri) and waterhemp (Amaranthus tuberculatus) continue to spread across Kentucky. Initially these pigweed species were thought to be present primarily in the west end of the state (Purchase area and along the lower Ohio River region), but have now been found in over 50 counties throughout Kentucky. These sightings would indicate that Palmer amaranth and waterhemp continues to be a growing threat to grain crop production within the state.

It appears that the introduction of these weeds on farms have come from a variety of sources. The seed size is extremely small which allow seed to be easily spread. It is known that some Palmer amaranth seed was introduced when cotton seed hulls were fed to livestock and the subsequent manure spread on crop fields. Other possible routes for introduction can be from purchasing used combines, headers and farm equipment from other states; trucks hauling supplies from the southern regions of the US where Palmer amaranth is widespread or the Midwest where waterhemp is more prevalent; or transport of farm equipment from farm to farm. Another source appears to be through planting cover crop seed that is not inspected or cleaned of unwanted weed seed.

Tuesday, August 25, 2015

US-EPA Grants Section 18 Emergency Exemption Label for Use of Transform™ WG for Control of Sugarcane Aphid on Grain Sorghum in Kentucky.

Doug Johnson, Extension Entomologist, University of Kentucky

The United States Environmental Protection Agency (US-EPA) has granted the use of Transform™ WG for control of the sugarcane aphid, (Melanaphis saccahri) on sorghum.

Update & Correction Concerning Collection of Sugarcane Aphid in Kentucky Grain Sorghum

Doug Johnson, Extension Entomologist, University of Kentucky.

This note is provided for clarification of where in Kentucky Sugarcane aphid has been collected and identified. The first two collections were reported as Fulton and Graves counties. This was incorrect

Wednesday, August 12, 2015

Farmer Workshop for Precision Ag Data Collection & Management

A Precision Ag Data Collection Workshop is scheduled for August 24 and August 25, 2015 at the Kentucky Soybean Promotion Board Office in Princeton, Kentucky. The endeavour is part 5 in a series. Dr. Joe Luck at Nebraska (and a UK grad) is coordinating the workshop. Other speakers include Dr. Mike Sama and Dr. Josh McGrath (both at the University of Kentucky). Dr. John Fulton at Ohio State and Dr. Brian Luck at Wisconsin (both UK grads) will also be presenting. The session is $25 and space is limited. Please register your spot.

Monday, August 10, 2015

Sugarcane Aphid Collected in Kentucky

Doug Johnson, Extension Entomologist, University of Kentucky

Sugarcane aphid (SCA) has been collected in two western Kentucky (KY) Counties. County Extension Agents Ben Rudy in Fulton Co. and Trent Murdock in Graves Co. have collected SCA from grain and sweet sorghum respectively. Identity was confirmed by Dr. Lee Townsend, Extension Entomologist, with the University of Kentucky (UK) in Lexington. Thus far, only the two infestations have been reported. The infestation in Fulton Co. is below treatment threshold, but the infestation in Graves Co. is much larger. Regardless of size, this does confirm that this new sorghum pest which likely migrates in from the Deep South can reach Kentucky during, if late, in the production season. Sugarcane aphid is a threat to all forms of sorghum (grain, forage, sweet) and will infest many other grasses including Johnson grass, which can act as a host for reproduction and a source of infestation.