Treatments

2009 Season

2010 Season

Pre count
±SE*

Mean number of H. armigera  larvae  ± SE

Reduction %

Pre count
±SE

Mean number of H. armigera  larvae ± SE

Reduction %

Initial

Residual

Annual Mean

Initial

Residual

Annual Mean

3 days

7 days

10 days

3 days

7days

10
days

Mean

3 days

7 days

10 days

3
days

7 days

10 days

Mean

Dipel DF

11.0±0.4

13.0±0.4

15.0±.08

15.0±0.8

11.4

9.1

13.9

11.5

11.5b

14.0±0.8

14.0±0.8

17.0±0.8

16.0±0.9

15.8

11.7

8.6

10.2

12.0b

Protecto

10.0±0.9

11.0±0.9

12.0±0.9

13.0±0.9

17.5

20.0

17.90

18.9

18.5b

15.0±0.9

16.0±0.4

16.0±0.9

17.0±0.9

10.2

22.4

9.3

15.9

13.9b

Bioranza

10.0±0.4

12.0±0.8

13.0±0.8

11.0±0.8

10.0

13.3

30.50

21.9

17.9b

15.0±0.8

16.0±0.8

18.0±0.8

13.0±0.8

10.2

12.7

30.7

21.7

17.9-b

Chlorfluazuron

12.0± 0.8

4.0±0.4

3.0±0.4

3.0±0.4

75.0

83.3

84.20

83.7

80.8a

13.0±0.9

3.0±0.4

4.0±0.9

3.0±0.8

80.6

77.4

81.5

79.5

79.8a

Pyriproxyfen

10.0±0.4

11.0±0.9

12.0±0.8

12.0±0.8

17.5

20.0

24.20

22.1

20.6b

17.0±0.8

17.0±0.8

19.0±0.8

18.0±0.8

15.8

18.7

15.3

17.0

16.6b

Control

12.0±8

16.0±0.8

18.0±0.9

19.0±0.9

----

----

----

----

----

16.0±0.9

19.0±0.9

22.0±0.8

20.0±0.4

----

----

----

----

----

LSD0.05

 

 

 

 

 

 

 

 

10.48

 

 

 

 

 

 

 

 

11.49

P values

 

 

 

 

 

 

 

 

000***

 

 

 

 

 

 

 

 

000***

*SE = Standard Error
**Means under each variety sharing the same letter in a column are not significantly different at P<0.05.

Table 1: Reduction percentage of the tested insecticides against Helicoverpa armigera larvae in cotton field during two successive seasons, 2009 and 2010 seasons.