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Welcome Rain

Welcome Rain

Great for filling ponds but not so great for sensitive greenhouse crops


Last weeks heavy downpours were very welcome.  The water tanks were so low, before last week’s heavy rain, that unless it rained water would have to be brought in by truck.

The Auckland dam levels are up to 72.49% of their capacity.  However, the historical average is 91.38% for this time of the year.  This means that even though the levels are increasing Aucklanders will be under tight water restrictions for some time to come.  The next week looks like more rain is on the way.  Hopefully this increases dam levels further.



The only negative and consequence of the heavy rain has been the increased humidity and unwanted fungal pressure.  Two weeks ago, I reported on lower than average light levels, unfortunately this has continued.  Older crops will certainly be disliking the ‘in and out’ weather and when a crop is placed under stress and conditions are warm and wet the recipe for fungus infection is perfect. 

Cucumber and tomato crops are both in the firing line this week.  As well as pest pressure the changeable weather is making it hard to apply preventative fungicides at ideal times.


Funguses to look out for – tomato

  1. Powdery Mildew
  2. Leaf mould
  3. Botrytis
  4. Blight


Funguses to look out for – cucumber

  1. Downy mildew
  2. Gummy stem blight (Didymella) on the plant and fruit


There are some really fantastic products that can be used safely, there are even products with little or no with holding periods. 


Tip of the week:

Other options are to make sure that de-leafing is up to date and that there is good air circulation.  It is warm but minimum pipes are still very useful for controlling rapid spread of fungal infections even at this time of the year.



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Article Written and compiled by Stefan Vogrincic, Consultant, Grower2Grower

Article Edited by Marie Vogrincic, Editor, Grower2Grower