(F74)
SUNFLOWER: Helianthus annuus L.
SMALL PLOT ASSESSMENT OF INSECTICIDES AGAINST THE SUNFLOWER HEAD MOTH
J. R. Whitworth
Department of Entomology
Kansas State University
123 Waters Hall
Manhattan, KS 66506
Phone: (785) 532-5656
Fax: (785)532-6232
E-mail: [email protected]
G.E. Wilde
A. Ahmad
P. Sloderbeck
Sunflower head moth: Homoeosoma electellum (Hulst)
Field performance of selected foliar insecticides was evaluated for their efficacy at controlling sunflower head moth and
protecting sunflower. Experiments were conducted in heavily-infested field in Manhattan, KS (2006) and Dickinson Co.
KS (2007). The experiments were designed as a randomized complete block with 11 treatments in four replicates. Each plot
was 2 rows, 12.20 m long with 76.2-cm row spacing at Manhattan, KS and four rows, 6.19 m long with 76.2-cm row
spacing at Dickinson Co., KS. Treatments were applied at 70-80% bloom on 6 Jul 2006 (Manhattan) and 21 Jul 2007
(Dickinson Co.) using a Solo back pack sprayer delivering 20 gpa at 30 psi. Two applications of insecticides, Baythroid XL
@ 2.0 oz./acre (in both years) and Mustang Max @ 2.56 oz./acre (only in 2007) were made at 7 days interval. Two
sunflower heads were randomly selected from each plot and dissected to count the numbers of larvae. Data were analyzed
using analysis of variance (ANOVA) and means were compared with the LSMEANS procedure (P = 0.05) of PROC GLM.
In 2006, all treatments resulted in significantly less number of larvae per head than the untreated check. Single application
of Mustang 1E @ 2.56 oz./acre and two applications of Baythroid XL @ 2.0 oz./acre gave maximum sunflower head moth
control, while one application of Baythroid XL at the same rate provided the least level of control (55.4% of check). The
other treatments had intermediate levels of control. All treatments had significantly reduced numbers of sunflower head
moth larvae than the untreated check in 2007. Two applications of Baythroid XL @ 2.0 oz./acre provided better control
than the single application at the same or high rate. However, control with two applications of Mustang Max EC @ 2.56
oz./acre was not different from the single application at the same or high rate. Single application of Mustang Max EC @
2.56 and 4.0 oz./acre provided better control compared to other insecticides with single application. All other treatments
had intermediate levels of control.
Table 1.
Treatment*
Untreated
Baythroid XL
Baythroid XL
Proaxix 0.5SC
Warrior 1E
Furadan 4F
Lorsban 4E
Asana 0.6 EC
Mustang 1E
*Baythroid XL
Cobalt
Rate
amt prod/acre
Sunflower headmoth/
head - 2006
--2.0 oz
2.8 oz
2.56 oz
2.56 oz
1 pt
1 pt
5.8 oz
2.56 oz
2.0 oz
19 oz
13.1 a
5.8 b
2.4 cde
5.1 bc
4.3 bcd
3.5 bcd
5.0 bc
4.1 bcd
1.0 de
0.0 e
5.1 bc
* All treatments applied on 6 July. Baythroid XL @ 2.0 oz
was applied again on 12 July.
Means within a column followed by the same letter are not
significantly different (P > 0.05; PROC GLM; LSMEANS)
Table 2.
Treatment*
Untreated
Baythroid XL
Baythroid XL
*Baythroid XL
Mustang Max EC
Mustang Max EC
*Mustang Max EC
Asana 0.6EC
Warrior 1E
Lorsban 4E
Cobalt
Rate
amt prod/acre
--2.0 oz
2.8 oz
2.0 oz
4.0 oz
2.56 oz
2.56 oz
7.75 oz
3.2 oz
1.0 pt
19.0 oz
Sunflower headmoth/
head - 2007
15.6 a
7.0 bc
4.4 d
0.3 f
1.3 f
1.9 ef
0.4 f
5.8 bcd
4.3 de
8.1 b
5.4 cd
* All treatments applied on 21 July. Baythroid @ 2.0 oz and
Mustang Max @ 2.56 oz applied again on 28 July.
Means within a column followed by the same letter are not
significantly different (P > 0.05; PROC GLM; LSMEANS)