30
Aug 2022

Pythium and Didymella causing you issues?

Pythium and Didymella causing you issues?
Increased monitoring required to reduce production losses

Throughout August I was not overly surprised by the amount of Pythium, Didymella and abortion on cucumbers crops I saw on plants.   The weather, up until this week, has been challenging to say the least. Growers were spoilt with fantastic weather during May and June, but July and August were terrible.

From my observations some technical growing ‘missed opportunities’ are factors to current production losses; it is too simple to place all the blame on the weather. It is obvious the growers that invest in equipment, such as sensors, are having less issues.

 

My observations:

 

  • Managing water content – water content sensors or scales play a huge role in making sure you Do NOT overwater. Overwatering is sure to exacerbate a multitude of issues.
  • Crop loading and temperatures – you should not have high fruit loads with terrible light levels and not expect abortion or other plant health issues to arise.
  • Heating –I don’t think this year it has been a case of heating too much, it’s more likely not enough due to high energy costs. This has been very evident in the supply of both tomatoes and cucumbers.
  • Currently cucumbers are expensive – so was it worth not heating correctly and how much disease resulted from this?
  • A shortage of labour – how has this effected keeping up with crop work? This will lead to less-than-ideal leaf removal and therefore an increase in fungal pressure.
  • Are you combining sprays to save on time? I have seen damage from this.
  • Have you identified cupping on the leaf as an issue – is this a variety issue caused by low light or a specific lack of certain trace elements? If you don’t test you will only be speculating.

 

Below are links to previous articles written about cucumber issues identified previously. There is a link to an article regarding Edema – it explains my last point above. The spring and summer will mask issues, but the winter will not be your friend. Keep this in mind for next year.

I understand, this year like no other, growers are under pressure and have a multitude of issues to deal with. Labour shortages are an issue for many industries. My local veterinary clinic is now closed on Fridays due to a lack of vets!  Hopefully by identifying current ‘growing’ issues this will reduce the effects of disease and production loss in future seasons.

 

https://www.grower2grower.co.nz/cucumbers-didymella-on-the-rise/ 

 

I have seen this cupping/leaf distortion again this year. It may be winter/low light or the variety.  However, I have not seen it in this variety before – could it be Edema?   Too much or not enough trace elements?

Edema in cucumbers – https://www.greenhousecanada.com/dealing-with-edema-30210/#:~:text=Edema%20(or%20odema)%20is%20a,more%20common%20in%20winter%20crops.&text=Take%20a%20close%20look%20for,you’re%20in%20the%20crop.

 

Article written and compiled by Stefan Vogrincic

All Article’s checked and edited by Marie Vogrincic

I appreciate your comments.  Please feel free to comment on the grower2grower Facebook page:

https://www.facebook.com/StefanGrower2grower/

CLASSIFIED

Subscribe to our E-Zine

Sign up here to subscribe to the Grower2grower Ezine. Every two weeks you will receive new articles, specific to the protected cropping industry, informing you of industry news and events straight to your inbox.

More

From This Category

To truss arch or not to truss arch?
May 7, 2024
To truss arch or not to truss arch?
The decision to recommend truss arches on tomato crops is not that complicated, just do it! Even though I say just do it, there are contributing factors if you decide to apply truss arches.  I will list these factors below, but in general I have never seen a negative result when applying arches correctly and at the right time of the crop cycle.  What I do see is growers placing the arches incorrectly, in the wrong place at the wrong angle and far too late in the development of the truss.
Certhon launches lettuce yield forecasting software with 95% accuracy
May 6, 2024
Certhon launches lettuce yield forecasting software with 95% accuracy
Thevi, a revolutionary yield forecasting software package, gives lettuce growers the certainty to plan effectively, make informed decisions and optimize pricing strategies.
A crop on the cusp of ruin by leaf mould and the return of psyllid yellows.
April 23, 2024
A crop on the cusp of ruin by leaf mould and the return of psyllid yellows.
As autumn approaches growers face a different set of problems that require different solutions.
Signify foresees a bright future for vertical farming, driven by automation and diversification.
April 23, 2024
Signify foresees a bright future for vertical farming, driven by automation and diversification.
Innovative automation and digitization technologies are increasingly helping to make cultivation more productive and efficient, and to improve the interaction between hardware and software.
Revitalise your orchard – the use of Sili-Fert P for next-level apple quality
April 23, 2024
Revitalise your orchard – the use of Sili-Fert P for next-level apple quality
The fruit sector is under a huge amount of pressure due to the limitation of most plant protection products and climate change creating more stress for the trees.
More efficient cultivation with controlled raising under LED lighting
April 8, 2024
More efficient cultivation with controlled raising under LED lighting
What cultivation methods do you employ? Options for enhanced rising and production efficiency:
CLASSIFIED