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Control of chocolate spot and rust in field beans


United Kingdom
March 17, 2014

Source: BASF Crop Protection UK

Disease Threats

The predominant diseases of field beans are Chocolate spot (Botrytis fabae), Leaf and pod spot (Ascochyta fabae), Rust (Uromyces fabae) and Downy mildew (Peronospora viciae). Chocolate spot and rust are the most commonly occurring diseases.

Chocolate Spot on beans

A very aggressive disease, especially in mild and humid or wet weather. Chocolate spot is easily identified by the small irregular chocolate coloured spots that can appear very early in the season. Severe defoliation, stem browning and loss of flowers leads to significant yield loss

Bean Rust

Typically seen later in the season, Bean rust is favoured by warm dry weather. Earlier infections can occur if conditions are suitable. Rust can develop very rapidly and can prove very difficult to control if conditions are conducive to rapid development. PGRO estimates yield losses as high as 40% from severe infections.

Protecting your crop

The best control of Chocolate spot and Bean rust will be achieved from a 2 spray programme. Optimum T1 timing will be at early flowering when the first signs of disease are visible. At T2, mid to late flowering, a follow up treatment should be used where disease threats remain at high levels to ensure long term disease control.

BASF offers a range of very effective fungicides for controlling disease in beans.

  Chocolate Spot Bean Rust Ascochyta
Walabi ***(*) ***  
Signum ***** ****(*) ****
Sunorg Pro **(*) ***** *
Compass **** **  

 

***** = Very good control
* = Poor control


SIGNUM

(pyraclostrobin + boscalid)

 

  • Best product for all round protection and persistence.
  • Excellent, long-lasting activity on Chocolate spot, Ascocyta and rust.
  • The first choice where disease pressure is moderate or high for both Chocolate spot and rust.
  • Signum also offers the physiological benefits of both boscalid and pyraclostrobin to the crop, resulting in increased green leaf retention through the season and reduction of stress.


COMPASS

(iprodione + thiophanate)

 

  • Preventative treatment against Chocolate spot with some activity against rust.
  • Use at early flowering for protectant activity against Chocolate spot.


WALABI*

(pyrimethanil + chlorothalonil)

 

  • Broad-spectrum preventative treatment against Chocolate spot and rust in low to moderate disease situations.
  • Should be applied before disease becomes established.
  • If disease levels remain low through the season, Walabi continues to offer broad spectrum protection.


SUNORG PRO/CARAMBA 90/JUVENTUS

(metconazole)

 

  • The product of choice for high-risk rust conditions, particularly where early signs of the disease are already apparent and kick back activity is required.
  • Protectant activity against Chocolate spot.

*Please note; Last sales of Walabi by BASF or distributors is 31 July 2014 with last storage, disposal and use up on farm ends 31 July 2015.


Application rate & timing recommendations
 

Situation Early flowering Mid - late flowering
Preferred choice in high or moderate risk situations. Signum
0.5 – 0.75 kg/ha
Repeat application after 2 weeks if disease pressure high
Low disease pressure - preventative for Chocolate spot with some activity against rust. Compass
3 l/ha
Repeat application after 2 weeks if disease pressure high
Low early disease pressure - Chocolate spot and rust protection   Signum
0.5 kg/ha
Moderate-high early disease risk with 2nd spray after 3-4 weeks if rust active but low risk of Chocolate spot. Signum
0.5 – 0.75 kg/ha
Sunorg Pro
0.6 – 1 l/ha
Low disease pressure early but higher risk develops during season Walabi
1.5 l/ha
Signum
0.5 kg/ha

 


 



More solutions from: BASF Crop Protection UK


Website: http://www.agricentre.basf.co.uk/agroportal/uk/en/startpage.html

Published: March 17, 2014

 

 

 

 

 

 

 

 

 

 

 


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