V-10170 Seed Treatments for Rice Water Weevil Control

V-10170 Seed Treatments for Rice Water Weevil Control
Protocol: 72.13
Block 4S
Beaumont, TX
2009
PLOT PLAN
⇐ North
I II III IV
1 3 9 7 17 6 25 2
2 2 10 1 18 3 26 8
3 6 11 4 19 5 27 7
4 8 12 3 20 2 28 1
5 1 13 5 21 8 29 5
6 4 14 2 22 4 30 6
7 7 15 6 23 7 31 3
8 5 16 8 24 1 32 4
Plot size: 7 rows, 7 inch row spacing, 18 ft long, with barriers
Variety: Cocodrie (seed provided by LSU Foundation Seed)
Note: smaller numbers in italics are plot numbers
TREATMENT DESCRIPTION, RATE AND TIMING
Treatment no. Description a (g ai/hkg)
Rate
1 Maxim 4FS + Apron XL + Cruiser 2.5 + 4.0 + 80
2 V-10230 + V-10170 17.5 + 75
3 V-10240 + V-10170 17.5 + 75
4 V-10260 + V-10170 17.5 + 75
5 V-10178 + V-10170 10 + 75
6 V-10282 + V-10170 42.5 + 75
7 V-10230 + Karate Z 17.5 + 0.03 lb ai/A
8 Untreated ---
a All seed treatments except Karate Z (foliar applied before permanent flood)
22
M.O. Way ⋅ moway@aesrg.tamu.edu ⋅ (409)752-2741 ext.2231
Texas AgriLife Research and Extension Center at Beaumont ⋅ 1509 Aggie Dr. ⋅ Beaumont, TX 77713 ⋅ http://beaumont.tamu.edu

V-10170 Seed Treatments for Rice Water Weevil Control
Agronomic and Cultural Information
Experimental design: Randomized complete block with 8 treatments and 4 replications
Planting:
Drill-planted Cocodrie @ 80 lb/A into League soil (pH 5.5, sand 3.2%, silt
32.4%, clay 64.4%, and organic matter 3.8 - 4.8%) on Apr 7.
Plot size = 7 rows, 7 inch row spacing, 18 ft long with metal barriers
Emergence on Apr 20
Irrigation: Flushed blocks (temporary flood for 48 hours, then drain) on Apr 7
Note: Plots were flushed as needed from emergence to permanent flood
Permanent flood (PF) on May 11
Fertilization: All fertilizer (urea) was distributed by hand.
56.7 lb N/A (1/3 of 170) on Apr 7 at planting
56.7 lb N/A (1/3 of 170) on May 11 before PF
56/7 lb N/A (1/3 of 170) on Jun 1 at panicle differentiation
40 lb N/A on Jul 6
Total N = 210 lb/A
Herbicide:
Treatments:
Stam 80EDF @ 2.0 lb, Basagran @ 0.75 lb, Facet 75DF @ 0.25 lb and Ordram
@ 2.0 lb (AI)/A and Agri-Dex @ 1.0 pt/acre with a 2-person hand-held spray
boom (13- 80015 nozzles, 50 mesh screens, 16 gpa final spray volume) on May
6 for early season weed control
All seed treatments applied by Valent.
Treatment 2 (Karate Z @ 0.03 lb AI/A) applied using a hand-held, CO 2
pressurized, 3 nozzle (800067 tips with 50 mesh screens, 29 gpa) spray rig on
May 11 (before PF).
Sampling: Stand counts (3, 3 ft counts on rows 2, 4 and 6) on May 2
No differences noted among treatments for stand, vigor, phyto to herbicides, etc.
on May 11
Rice water weevil (RWW) cores (5 cores per plot, each core 4 inches diameter, 4
inches deep, containing at least one rice plant) were collected on Jun 1 and Jun
11. Core samples were stored in a cold room, later washed through 40 mesh
screen buckets and immature RWW counted.
Whitehead (WH) counts on rows 1 – 3 and 5 – 7; 10 WHs collected for
dissection (4 MRB; 0 SCB) on Jul 21
Harvest: Harvested all plots on Aug 4
Size harvested plot = 7 rows, 7 inch row spacing, 18 ft long
Data analysis: RWW and WH counts transformed using x + 0.5 ; yields converted to 12%
moisture; all data analyzed by ANOVA and means separated by LSD
23
M.O. Way ⋅ moway@aesrg.tamu.edu ⋅ (409)752-2741 ext.2231
Texas AgriLife Research and Extension Center at Beaumont ⋅ 1509 Aggie Dr. ⋅ Beaumont, TX 77713 ⋅ http://beaumont.tamu.edu

V-10170 Seed Treatments for Rice Water Weevil Control
Discussion
On May 11 (before PF), rice plants in all treatments appeared similar. RWW populations
were very high in the untreated on the first sample date. All treatments with V-10170
(clothianidin active ingredient) provided excellent control of RWW on both sample dates (Table
1). None of the treatments provided control of stalk borers, as measured by WH density. The
majority of the stalk borers was Mexican rice borer. All treatments with V-10170 produced
excellent yield responses (compared to the untreated, the average increase in yield for all
treatments containing V-10170 was 1115 lb/A).
Table 1. Mean data for Valent seed treatments for rice water weevil (RWW) control. Beaumont,
TX. 2009.
Rate
Stand
(plants/3
No. RWW b /5 cores
WHs b in Yield
Treatment a (g ai/hkg) ft of row) Jun 1 Jun 11 6 rows (lb/A)
Maxim 4FS +
2.0 +
Apron XL + Cruiser 4.0 + 80
35 8 b 9 b 47 8264 ab
V-10230 + V-10170 17.5 + 75 35 1 c 2 cd 51 8842 a
V-10240 + V-10170 17.5 + 75 35 0 c 2 cd 37 8473 ab
V-10260 + V-10170 17.5 + 75 36 2 c 1 cd 42 8838 a
V-10178 + V-10170 10 + 75 33 0 c 0 d 40 8861 a
V-10282 + V-10170 42.5 + 75 33 1 c 1 cd 38 8730 a
V-10230 + Karate Z
17.5 +
0.03 lb ai/A
33 2 c 4 bc 31 8854 a
Untreated --- 32 108 a 47 a 45 7634 b
NS
NS
a All treatments are seed treatments except Karate Z (foliar applied before permanent flood)
b RWW = rice water weevil (larvae + pupae); WHs = whiteheads
Means in a column followed by the same or no letter are not significantly (NS) different (P =
0.05, P = 0.07 for yield, ANOVA and LSD).
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M.O. Way ⋅ moway@aesrg.tamu.edu ⋅ (409)752-2741 ext.2231
Texas AgriLife Research and Extension Center at Beaumont ⋅ 1509 Aggie Dr. ⋅ Beaumont, TX 77713 ⋅ http://beaumont.tamu.edu