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   I have a bug infestation in greenhouse,my cucumber is a  "write off". Any ideas on what it is and how to combat the      problem. Thanks.



  • Ladybird4Ladybird4 Posts: 36,223

    Its red spider mite John. It can be very difficult to eradicate but biological control is an option. Severely infected plants should be removed and destroyed.

    Cacoethes: An irresistible urge to do something inadvisable
  • DovefromaboveDovefromabove Posts: 84,007

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.

  • BobTheGardenerBobTheGardener Posts: 11,391

    Once the webs form on the tips of the plants, a red spider mite infestation has reached serious proportions.  The cucumber is finished so get rid of it.  Remove any webbing from other plants in your greenhouse and spray everything (especially the undersides of all leaves) with SB Plant Invigorator.  This sort of glues the mites (which are resistant to nearly all known pesticides) in place and they die. The SB is also a foliar feed which will help plants recover.  Repeat two or three times before introducing the spider mite predator.  The above is the only way to clear them which I can personally vouch for.

    In future years, keep a close eye on the plants as spider mite will over-winter in your greenhouse cracks and crevices.  Regularly spraying the inside of the GH with a fine mist of water will help as they don't proliferate so fast in humid conditions.

    A trowel in the hand is worth a thousand lost under a bush.
  • Thank you all for the advice. Will pull everything out of the greenhouse, except the grapevine and peach tree which are both planted in the ground and then use biological to try to get rid of pest.


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