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Whitefly in Polytunnel

Any suggestions for getting rid of whitefly in my polytunnel?
Devon.
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  • wild edgeswild edges The north west of south east WalesPosts: 7,525
    Have you tried sticky traps? You can put mesh around them to stop bees getting stuck if that puts you off. I'm trying an experiment by allowing spiders to take over my greenhouse to control bugs. Limited success so far but there's a lot of spider webs in there.
    A great library has something in it to offend everybody.
  • Hostafan1Hostafan1 Posts: 31,605
    I've got "fly papers" in there to combat the invasion of cluster flies, but the whitefly never fly that high. 
    My concern is that moving about 60 odd agapanthus and sundry other plants in there , it'll be like a banquet for them.
    Devon.
  • DovefromaboveDovefromabove Central Norfolk UKPosts: 77,403
    Can you fix the ‘fly papers’ onto tomato canes or similar so they’re lower down and easier for the whitefly to reach?
    “I am not lost, for I know where I am. But however, where I am may be lost.” Winnie the Pooh







  • Allotment BoyAllotment Boy North London Posts: 4,987
    Smoke bomb?
    AB Still learning

  • LynLyn DevonPosts: 19,902
    Diluted Fairy in a spray but you need to use it every three days or so. 
    Gardening on the wild, windy west side of Dartmoor. 

  • Hostafan1Hostafan1 Posts: 31,605
    have you seen this @Fairygirl ???
    Devon.
  • Hostafan1Hostafan1 Posts: 31,605
    Not the first time Fairy has been swished and sprayed :D
    ooh erh Missus
    Devon.
  • BobTheGardenerBobTheGardener Leicestershire, UKPosts: 11,336
    How bad is it @Hostafan1 ?  I know you have a very large one (more ooer missus!) but are the whitefly on many plants, or currently confined to just a few?  If the latter or if some plants are heavily infested I would move those outside and well away or even consider sacrificing them.  Whitefly is a absolute s*d to eradicate in large covered areas. 😖
    A trowel in the hand is worth a thousand lost under a bush.
  • Hostafan1Hostafan1 Posts: 31,605
    How bad is it @Hostafan1 ?  I know you have a very large one (more ooer missus!) but are the whitefly on many plants, or currently confined to just a few?  If the latter or if some plants are heavily infested I would move those outside and well away or even consider sacrificing them.  Whitefly is a absolute s*d to eradicate in large covered areas. 😖
    Yup, that's the trouble, the tunnel is the "hot" one, all polythene, no netting and is 48ft by 21ft. 
    I've left the doors open at night for a few weeks now as it's cooling down and I've gone over everthing with a fine spray on the end of the hose but they've really taken hold.
    Devon.
  • BobTheGardenerBobTheGardener Leicestershire, UKPosts: 11,336
    I think you're probably going to have to go down the predator route, with tiny Encarsia formosa wasps.  I'd try spraying the plants with soapy water first to keep some control over the winter and introduce the wasps next spring once the temps in there won't fall below 10C (or close it up and heat it now to maintain above that for a few weeks?)  Not cheap though.
    A trowel in the hand is worth a thousand lost under a bush.
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