(F31) CORN (FIELD): Zea mays L. EVALUATION OF CORN SEED TREATMENT WITH CRUISER EXTREME (A14115) IN LOUISIANA, 2006 F. Huang Department of Entomology LSU AgCenter Baton Rouge, LA 70803 Phone: (225) 578-0111 Fax: (225)578-1643 E-mail:
[email protected] D. Cook Northeast Research Station LSU AgCenter St. Joseph, LA 71366 B. R. Leonard Macon Ridge Station LSU AgCenter Winnsboro LA 71295 White grubs: Phyllophaga spp. Cutworm: Agrotis spp. Southern corn rootworm: Diabrotica undecimpunctata howardi (Barber) Chinch bug: Blissus leucopterus leucopterus (Say) Sugarcane beetle: Euetheola rugiceps (LeConte) Field performance of ten selected seed treatments was evaluated against soil insects in field corn at the Northeast Research Station near St. Joseph, LA. Corn seeds pre-treated with Cruiser Extreme (A14115) and other seed treatments were planted on a commerce silt loam soil on 15 May with a John Deere 7100 series planter equipped with 10-inch seed cones mounted to replace the seed hoppers. Plot size was 4 rows (centered on 40 inches) x 65 ft. Granular in-furrow treatments (Force 3G) were applied at planting with 8-inch belt cone applicators mounted to replace the standard granular applicators. Treatments were replicated four times in a RCB design. Plant density and number of healthy plants were recorded at 21, 28, and 35 DAP by examining 10 ft on each of the two center rows within each plot. Grain yield was determined by mechanically harvesting the two center rows of each plot on 15 Sep. Grain yield was adjusted to 14% moisture. Data collected from the two center rows in each plot were pooled. Pooled data were analyzed using ANOVA and means were separated using the LSD test at 0.05. Insect pest pressure was very low during the test period. There were no significant differences in plant stand, number of healthy plants, and grain yield among the ten treatments. The results suggest that benefit of corn seed treatments is not warranted in Louisiana when pest pressure is low.
Table 1. No. plants/20 ft Treatment/ formulation
Rate (AI) CWT or per seed
No. healthy plants/20 ft
21 DAT
28 DAT
35 DAT
21 DAT
28 DAT
35 DAT
Grain wt (kg/plot)
Maxim 324 FS A14115 340 FS Cruiser 600 FS
0.056 oz/CWT 0.138 mg/seed 0.125 mg/seed
38.3 34.0
35.50 31.8
39.0 36.5
37.3 33.8
35.5 36.3
34.8 33.5
15.2 14.4
A14115 430 FS Cruiser 600 FS Maxim 324 FS Apron 350 FS Dynasty 100 FS Cruiser 600 FS Maxim 324 FS Apron 350 FS Dynasty 100 FS Cruiser 100 FS Apron 350 FS Maxim 324 FS STP15199 STP15201
0.138 mg/seed 1.125 mg/seed 0.056 oz//CWT 0.016 oz/CWT 0.016 oz/CWT 0.25 mg/seed 0.056 oz/CWT 0.016 oz/CWT 0.016 oz/CWT 1.25 mg/seed 0.016 oz/CWT 0.056 oz/CWT 0.08 oz/CWT 0.25 mg/seed
33.8
31.3
32.3
31.
31.3
28.8
16.8
33.8
33.5
30.8
29.5
30.0
27.8
15.0
29.5
26.8
32.3
30.8
31.8
30.3
14.2
34.3
34.0
33.5
32.8
33.8
30.8
16.2
Maxim 324 FS STP15281 A14115 340 FS Cruiser FS Force GR A14115 340 FS Cruiser 600 FS Force 3 GR A14115 340 FS Cruiser 600 FS Force 3 G
0.056 oz/CWT 3.6 oz/CWT 0.138 mg/seed 0.125 mg/seed 1.63 lb/acre 0.138 mg/seed 0.125 mg/seed 2.45 lb/acre 0.138 mg/seed 0.125 mg/seed 3.27 lb/acre
35.5
33.3
37.8
30.3
33.8
29. 3
13.3
35.5
35.5
37.8
36.5
37.8
36.0
19.1
33.3
31.8
35.0
32.3
29.8
28.5
14.6
36.0
32.3
32.8
33.5
37.3
33.3
17.7
NS
NS
NS
NS
NS
NS
NS
(LSD P = 0.05)
Means within a column are not significantly different (LSD:P = 0.05).
