(E15)
CUCUMBER: Cucumis sativus L. ‘Greensleeves’
CONTROL OF SILVERLEAF WHITEFLY IN CUCUMBER, SPRING 2006
Dakshina R. Seal
University of Florida-IFAS
18905 S.W. 280th St.
Homestead, FL 33031
Tel: (305) 246-7001 ext 260
Fax: (305) 246-7003
[email protected]
Silverleaf whitefly (SLW): Bemisia argentifolii Bellows and Perring
‘Greensleeves’ cucumber was seeded in a Rockdale soil on 10 Mar 2006. A RCB design was employed to provide 4
replicates each for six treatments comprising a plot size of 2 rows, 30 ft long. All treatments were applied in the furrow on
2 Apr delivering a volume of 50 ml per plant. No phytotoxicity was observed with any of the treatments. Evaluation of
treatments was conducted on 3, 11 and 19 Apr by thoroughly checking five randomly selected leaves, one leaf/plant, per
treatment plot for SLW adults. After recording the number of adults, each leaf was incised and placed in a zip-lock bag and
transported to the laboratory. Mean numbers of SLW eggs and nymphs on three 1 cm2 randomly selected areas of each leaf
was recorded using a binocular microscope. Data were analyzed by ANOVA and mean separation used DMRT.
All insecticide treatments significantly reduced SLW adults on cucumber when compared with the nontreated control
(Table 1). Mean no. of SLW eggs were also fewer on cucumber when treated with various insecticide treatments than the
nontreated control (Table 2). Like SLW eggs, insecticide treatments significantly reduced SLW nymphs on cucumber
(Table 3). Combination of V10170 and Venom, and Venom and Admire provided an improved level of control of SLW
populations on cucumber when compared with V10170 and Venom applied alone.
Table 1
Mean no. of SLW adults/leaf
Treatment
/formulation
Venom 20SG
V10170
Admire 2F
V10170
Venom 20SG
V10170
Venom 20SG
Venom 20SG
Admire 2F
Venom 20SG
Admire 2F
Control
Rate/acre
3 Apr
11 Apr
19 Apr
Mean
100 g.
4.0 oz
120 g
6.0 oz
150 g
4.0 oz
100 g
30 g
120 g
60 g
60 g
2.00b
2.47ab
3.40a
2.15b
0.65b
1.20b
0.85b
1.00b
8.30c
13.75ab
13.40b
9.00c
3.65b
5.87b
5.88b
4.05b
1.80b
1.25b
6.60c
3.22b
2.85ab
0.60b
8.30c
3.92b
2.75ab
1.10b
8.75c
4.20b
3.65a
2.70a
18.90a
8.42a
Means within a column followed by a similar letter do not differ
significantly (P > 0.05; DMRT).
Table 2
Mean no. of SLW eggs/cm
Treatment
/formulation
Venom 20SG
V10170
Admire 2F
V10170
Venom 20SG
V10170
Venom 20SG
Venom 20SG
Admire 2F
Venom 20SG
Admire 2F
Control
19 Apr
2
Rate/acre
3 Apr
11 Apr
Mean
100 g
4.0 oz
120 g
6.0 oz
150 g
4.0 oz
100 g
30g
120 g
60 g
60 g
1.45bd
1.10bd
2.85b
0.50cd
1.40b
1.30b
1.55b
0.45b
9.60c
24.10b
11.35c
7.10c
3.13bc
6.73b
4.04bc
2.01c
0.55cd
0.75b
11.50c
3.23bc
2.05bc
1.40b
11.60c
3.86bc
0.10d
1.40b
9.20c
2.70c
10.25a
6.55a
36.75a
13.68a
Means within a column followed by a similar letter do not differ
significantly (P > 0.05; DMRT).
Table 3
Mean no. of SLW nymphs/cm
Treatment
/formulation
Venom 20SG
V10170
Admire 2F
V10170
Venom 20SG
V10170
Venom 20SG
Venom 20SG
Admire 2F
Venom 20SG
Admire 2F
Control
2
Rate/acre
3 Apr 11 Apri 19 Apr
Mean
100 g
4.0 oz
120 g
6.0 oz
150g.
4 .0 oz
100 g
30 g
120 g
60 g
60 g
1.75b
1.65b
2.85b
1.85b
2.55a
0.50b
2.25a
2.25a
0.15a
0.00a
0.00a
0.10a
1.11b
0.54b
1.28b
1.05b
2.10b
2.45a
0.00a
1.14b
1.60b
3.70a
0.05a
1.34b
1.70b
2.10a
0.00a
0.95b
9.70a
3.55a
0.00a
3.31a
Means within a column followed by a similar letter do not differ
significantly (P > 0.05; DMRT).