EFFICACY OF FUNGICIDE F500? IN CONTROLLING ...EFFICACY OF F500®FUNGICIDE IN THE CONTROL OF ASIAN SOYBEAN RUST (Phakopsora pachyrhizi Syd.)IN SOYBEAN CROP. INTRODUCTION Ten trials

EFFICACY OF F500® FUNGICIDE IN THE CONTROL OF ASIAN SOYBEAN RUST

(Phakopsora pachyrhizi Syd.) IN SOYBEAN CROP.

INTRODUCTIONTen trials were performed during the 2006/2007 season in order evaluate different ready-mixes of Azoles + Strobilurinesfungicides against asian rust in soybean under preventative (5 trials) and curative (5 trials) conditions

RESULTS AND DISCUSSION

The results of the trials show the ranking of the treatments as follows: F500+Metconazole (65+40 ga.i-ha) > F500+Epoxiconazole (66,5+25 gai-ha) > Azoxystrobin+Ciproconazole (60+24 ga.i-ha)+specific adjuvant (0,5% v/v) > Tryfloxystrobin+Cyproconazole (60+20 gai-ha)+specific adjuvant(0,25% v/v) > Tryfloxystrobin+tebuconazol (50+100gai-ha)+specific adjuvant (0,25% v/v).

MATERIAL AND METHODSThe treatments were:

The treatments were sprayed at first symptom or flowering period (R1-R3). The applications were performed with a CO2propelled backpack sprayer equipped with Teejet nozzles (XR 8001 or XR 110015), 40 lb pol -2, and a spray volume of 150 L ha-1

Different regions (Campos Novos, SC, Ponta Grossa and Maua da Serra, PR, Rondonopolis, MT s and Goiania, GO states).

All ready-mixes, regardless of the formulation composition, greatly reduced the severity of the disease. However, it was observed that ready-mixes that contain fungicide F500® (BASF) had longer residual control and better yield than others.

1 BASF-SA Divisão Agro, 04538-132, São Paulo, SP, Brazil.(edson.begliomini@basf.com.)

E.Begliomini1; M.A.T. Rodrigues1; E. Leduc1; S.Zambom1; R.Ovijedo1 ;D.Zandonade1 ; R.Bellani1 ; C. Lelis1, M.Ecco1

Preventative conditions at first symptom or flowering period(R1-R2) and treated again in grain formation(R5.1-R5.2).

Curative conditions were treated at 2% of severity and treated again with 14-21 days after first application.

05

101520253035404550556065

1 2 3 4 5 6

PHAKPA (10 DAT )

PHAKPA (20 DAT)

% o

f sev

erity

Treatments

Curative condition

05

101520253035404550556065

1 2 3 4 5 6

PHAKPA (10 DAT )

PHAKPA (20 DAT)

% o

f sev

erity

Treatments

Curative condition

0

5

10

15

1 2 3 4 5 6

PHAKPA 20 DALA B

PHAKPA 30 DALA B

% o

f sev

erity

Treatments

Preventative condition

0

5

10

15

1 2 3 4 5 6

PHAKPA 20 DALA B

PHAKPA 30 DALA B

% o

f sev

erity

Treatments

Preventative condition

N o . T re a tm e n tsd o s e (g a .i/h a )

1 U n tre a te d -2 F 5 0 0 + M e tc o n a z o le 6 5 + 4 03 F 5 0 0 + E p o x ic o n a z o le 6 6 ,5 + 2 54 A z o x y s tro b in + C ip ro c o n a z o le 6 0 + 2 45 T ry flo x y s tro b in + C y p ro c o n a z o le 6 0 + 2 06 T ry flo x y s tro b in + te b u c o n a z o l 5 0 + 1 0 0