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Strawberries and Caneberries
 
University of California Agriculture and Natural Resources Agriculture and Natural Resources Blogs
THU, OCT 23 2014
3:59:46
Comments:
by Göran Wikesjö
on August 28, 2014 at 1:08 AM
Dear Sir,  
 
Like the article, quite useful. We grow raspberries in modern plastic greenhouses in the South of Portugal.  
 
We have from time to time, especially with high temp. problems with pollination.
by Mark Bolda
on August 28, 2014 at 5:15 AM
Hello Göran, I am curious as to what you think the genesis of the pollination problem is then in a situation where high temperatures exist. Is it that bee activity is much reduced, or do you believe that the temperatures are inhibiting pollen survival and reception?  
Thanks for reading the blog - it's flattering to have an audience from around the world!
by Göran Wikesjö
on August 31, 2014 at 12:07 AM
Mark,  
 
thanks for your reply.  
 
we grow 2 cycles per year.  
start crop with long canes Okt/nov with harvest febr/may there after movdown and harvest again aug/sept.  
 
all grown in high plastic greenhouses / 5,5 to gutter / total height 8 m with good ventilation cenital and lateral.  
 
Climate screen / high diffusion used to regulate light, temp and Rh.  
 
Try to obtain 28ºC max (plant temp ) 600-700 mmol.  
 
Honey bee hives outside 6 hives per Ha plus bumble bee hives inside greenhouses.  
 
Problem is more in autumn crop. We have LOTS of flowers but it seems as they are not attractive enough as bees do not enter more than 10-15 m into greenhouse and low activity even on bumble bee hives. Temperature can reach 35ºC. But in the morning until 11.00 temperature very moderate and still low bee activity.  
 
Is the pollen, due to too many flowers of bad quality and not attractive enough or is timing of start using bees to late.?  
 
like to know your opinion.  
 
best regards  
Göran
 
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