Optimising yield and quality in brassicas: Rudis and Nativo 75WG
Posted 10 years ago
06/07/2016
Key problems
Ringspot (Mycosphaerella brassicicola)
- Widespread problem across major brassica growing areas
- Favours wet weather and will develop at low temperatures
Powdery mildew (Erysiphe cruciferarum)
- Quality robbing pathogens
- Favours warm, humid weather
Light leaf spot (Pyrenopeziza brassicae)
- More severe in northern England and Scotland, affects the south especially in oilseed rape growing areas
- Favours cool, moist weather
Dark leaf spot (Alternaria spp)
- Less frequent than ringspot, but can still be a significant problem when it occurs
- Favours warm, wet weather
White blister (Albugo candida)
- Oomycete disease that’s a widespread problem across major brassica growing areas
- Favours warm, wet weather
What to use
Nativo 75WG provides long lasting protection against disease and is the best strobilurin based product for powdery mildew, only rivalled by Rudis.
Rate of use: 0.36 kg/ha
Max no. of applications: 2 per crop for brassica
Harvest interval: 21 days
12m aquatic buffer zone with obligatory use of Three Star Drift reducing nozzles
A spreader/wetter adjuvant will improve control of ringspot especially in a curative situation
Rudis is the product of choice where light leaf spot is present. Perfectly complements strobilurin based products, with its strong curative and protectant activity.
Rate of use: 0.4 L/ha
Max no. of applications: 3 per crop
Harvest interval: 21 days
LERAP B
Greening and physiological yield benefits similar to strobilurins
Best performer against ringspot (independent trials conducted in the Netherlands)
Most effective against powdery mildew as shown in 2014 SCEPTRE brassica trial (SCEPTRE Final Report 2015)
Use Nativo 75WG and Rudis in programmes for sustained broad spectrum disease control and physiological benefits to deliver top crop quality.
Less ringspot for better quality and more profit
The Netherlands, independant trial station Zwaagdijk 2008. Variety: Bartolo. Appl: 4-Jul, 24-Jul, 16-Aug, 8-Sep & 25-Sep. Untreated 100% infected heads
Powdery mildew control in swede
Example programme on Brussels sprouts
- Trials show the best response for boosting quality and yield comes from using Rudis in sequence with Nativo 75WG in programmes.
- If the crop is disease free when the programme begins, apply Nativo 75WG first (T1) for its protectant activity, then follow with Rudis and alternate the two.
- If the crop has disease present when the programme begins, apply Rudis first (T1) for its curative activity, then follow with Nativo 75WG and alternate the two.
- If applying two sequential sprays of Rudis or Nativo leave an interval of about 21 days between applications.
Follow FRAC guidelines for QoI based co-formulations: DO NOT exceed 50% of fungicide programme with Nativo 75WG or other strobilurin based products. Rudis is an ideal alternation partner.