Insect and Nematode Pests in Cotton: A Focus on Thrips Gene Burris - PowerPoint PPT Presentation

Seed Treatments to Manage Insect and Nematode Pests in Cotton: A Focus on Thrips Gene Burris LSU Ag Center

Efficacy of Seed Treatments Against Thrips • Thrips occurrence in untreated plots • Thrips efficacy changes due to rate increases • Thrips efficacy changes due to the addition of a nematicide • Using GreenSeeker NDVI for plant vigor ratings

UTC - NYMPHS UTC - ADULTS 45 40.3 40 35 No./ 5 plants 30.3 30 27.8 25 24.3 22 20 16.5 15 10 6 5 3 3 1 1 1 0 20 DAP 23 DAP 27 DAP 31 DAP 34 DAP 38 DAP DAYS AFTER PLANTING Fig.1 Thrips Occurrence In Untreated Plots

UTC CRUISER 0.3 45 CRUISER 0.34 40.3 40 AVICTA 35 No./ 5 plants 30.3 30 27.8 25 24.3 22 20 16.5 15 10 5 0 20 DAP 23 DAP 27 DAP 31 DAP 34 DAP 38 DAP DAYS AFTER PLANTING Fig. 2 Efficacy of Cruiser Rates and AVICTA Complete PAC

Example 2) GreenSeeker NDVI • Improves plot data management – 1) handheld – 2) mobile

GreenSeeker NDVI Example – handheld at cottons pre-bloom stage 0.800 0.700 0.600 Non-treated 0.500 NDVI Cruiser 5FS 0.400 Gaucho Grande 5FS 0.300 0.200 Temik 15G IFG 0.100 0.000 38 DAP 48 DAP Treatment

Use of NDVI To evaluate plots

Test - SJ08CT03a, on light soil with high nematodes • Geo-referenced tiers on the Northeast Res. Sta. • .shp point data, 40 DAP represents GreeenSeeker NDVI • Mobile mount, RTK GPS • Darker blue equal higher NDVI due to Temik 15G sidedress treatments. • Back ground is Veris ec a

Other considerations for the use of seed treatments • Implications for resistance in other pests – mites, aphids and plant bugs • Pest status – expect changes in species due shifts in crop status on farms • Management recommendations – plan for soil type variability and nematode pest status

2000 1642 1500 1327 1140 1225 1227 1211 1000 500 0 T + ACP ACP 80 lbs N 115 lbs N 135 lbs N

LSU Analysis - McCarter Effect DF F Value Pr > F N_rate 6 16.8 <.0001 Ec_zone 2 152.83 <.0001 N_rate*ec_Zone 12 1.24 <.0001 1250 1200 1150 70 1100 90 120 1050 150 1000 170 950 900 Seed Treatment X N Rate

• Seeding pests – thrips – aphids – mites – fungi – nematodes