20th Annual


NCSCRC Deemed A Success


BETTY VALLE GEGG-NAEGER MidAmerica Farmer Grower


production of MidAmerica Farm Publications and sponsored by Cotton Incorporated and US Rice Producers Association (USRPA), was another success. The event was held Jan. 30-Feb. 1 in Baton Rouge, La., and included the Southern Corn & Soybean Con- ference, Southern Precision Ag Conference and Delta States Irri- gation Conference. Tommy Valco, cotton technical


T


transfer coordinator for USDA- ARS in Stoneville, Miss., served as moderator and opened the program. He introduced John LaRose, publisher of MidAmerica Farm Publications who produced the program. “I’m proud to sponsor this con- ference,” LaRose said,


then


thanked Kater Hake of Cotton Inc. and Dwight Roberts of USRPA, as well as the corporate co-sponsors, which are BASF Corporation, Dow AgroSciences, DuPont Crop Protection/Pioneer Hi-Bred International Inc., He- lena Chemical Co., HorizonAg LLC, Monsanto and RiceTec, Inc. He also recognized the ag-media co-sponsor: Farm Press Publica- tions. He also lauded the academic


partners, Auburn University, Al- abama, LSU AgCenter, University of Tennessee, University of Arkansas, Mississippi State Uni- versity, Texas A&M University and University of Missouri; as well as the technical partners, USDA-ARS National Sedimenta- tion Laboratory, Oxford, Miss., USDA-ARS Jamie Whitten Delta States


Research included Center,


Stoneville, Miss., and USDA-ARS National Soil Dynamics Labora- tory, Auburn, Al. Attendees


287


farmer/producers, 118 consult- ant, 113 researcher/educa- tion/government officials, 122 Industrial representatives and five media. Acres farmed by producers at-


tending averaged 5,489 acres each for a total of 11,575,343 acres represented, which in- cluded cotton, rice, corn, soy- beans, wheat and sorghum. Next year’s conference is set for


Jan. 10-12, 2018. at the Hilton Hotel and Convention Center in Memphis, Tenn.


∆ BETTY VALLE GEGG-NAEGER:


Senior Staff Writer, MidAmerica Farmer Grower


damage caused to grains by the trans- mission of barley yellow dwarf virus (BYDV). Infection by BYDV in early growth stages of the host plant are the most damaging since it can stunt growth of the crop and produce heads of reduced size. Bird cherry-oat aphid populations are generally managed by natural predators, such as parasitic wasps, lady beetle larvae, lacewing larvae, and hoverflies. On March 30, 2017, a large popula-


tion of the bird cherry-oat aphid was detected in a barley field in Logan County located in Western Kentucky. The numbers of aphids per row foot were above the economic threshold (our aphid tallies in this field were greater than 100 aphids per row foot), despite the field being treated twice with a synthetic pyrethroid. Aphid-in- fested barley plants were taken to the lab for further evaluation on pesticide resistance. Upon examining the sam- ples in the laboratory, fungal spores (Figure 2a) were spotted on the blades of barley with moribund (dead) aphids. A small study was conducted with four different concentrations of Baythroid and a water control. The study consisted of three replication each with two 4-centimeter blades of barley and ten aphids per Petri dish. The effect of the pesticide was moni- tored at 24 hours and the results will be discussed in a later publication. However, there was a significant mor- tality due to the fungal spores in all treatments (Figure 2b); about 43 ± 0.66 (mean ± SEM) percent of the aphids in the water control replicates were affected by unidentified ento- mopathogenic fungi. The occurrence of this entomopatho-


NEWSANY Equipment: PERRYVILLE, MO.


he 20th Annual National Conservation Systems Cot- ton & Rice Conference, a


Entomopathogenic Fungus May Cause High Mortality On Aphids


in Kentucky on small grains, such as winter wheat and barley. R. padi is of economic importance due to the direct


T Figure 2a.


YAZIRI GONZALEZ AND DR. RAUL VILLANUEVA PRINCETON, KY.


he bird cherry-oat aphid,


Rhopalosiphum padi (Figure 1), is one of the common aphids found


genic fungi could be due to the warmer temperatures and high hu- midity resulting from rains occurring across Western Kentucky.


Insect-


killing fungi thrive in humid environ- ments, which allow fungal spores to spread throughout soil and ultimately aphid populations. Upon this finding, under the current conditions in Western Kentucky, entomopath- ogenic


fungi might


cause mortalities on aphids and preventative


Figure 1.


sprays with synthetic pyrethroids may be unnecessary.


∆ YAZIRI GONZALEZ: Entomologist,


University of Kentucky DR. RAUL VILLANUEVA: Extension Entomologist, University of Kentucky


Figure 2b.


Figure 1. Adult bird cherry-oat aphid Photos: Yaziri Gonzalez, UK


Figure 2a. Naturally occurring unknown fungal spores developing on bird cherry- oat aphid nymph were collected from a Logan County barley field.


Figure 2b. Bird cherry-oat adult killed by the naturally occurring unknown fungi


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Contact: Steve Plunk April 7, 2017 / MidAmerica Farmer Grower • 13


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