Grow Your Own Magazine

Navbar button growfruitandveg.co.uk Logo
Forum Navigation

+ Reply to Thread
Results 1 to 6 of 6
Like Tree4Likes
  • 2 Post By Jungle Jane
  • 1 Post By unclefudgly
  • 1 Post By unclefudgly

Thread: Spider mite in greenhouse

  1. #1
    carly is offline Sprouter
    Join Date
    Mar 2013
    Location
    oxfordshire
    Posts
    221
    Blog Entries
    8

    Default Spider mite in greenhouse

    Got an infestation on beans and aubergine of red spider mite. Shall I remove all infested areas? I have begun taking leaves off but things are starting to look bare
    Whatís best?

  2. #2
    Jungle Jane's Avatar
    Jungle Jane is offline Early Fruiter
    Join Date
    Feb 2015
    Location
    Essex
    Posts
    4,065

    Default

    I always get spider mite on cucumber plants I grow in my house,I donít have a greenhouse. They donít affect any of my plants outside so put the plant outside if you can & spray both sides of the leaves with soapy water to try & keep the plants growing. Beans are a bit hard to move,if you removed the plants that are infested,would they begin to infest another plant? You might be better off spraying daily & just keeping the numbers down,it does disrupt them..
    carly and Earthgirl Jen like this.

  3. #3
    DannyK is offline Tuber
    Join Date
    Feb 2015
    Location
    Riddlesdown (S of Croydon)
    Posts
    845

    Default

    There is a biological control.

  4. #4
    unclefudgly's Avatar
    unclefudgly is offline Sprouter
    Join Date
    Sep 2009
    Location
    SW London
    Posts
    195

    Default

    Unfortunately if you get them once they will come back year after year. The only solution that works is to introduce predatory mites as soon as you see them, as it can take 4-6 weeks for the predatory mite numbers to increase to a sufficient level to tackle the infestation.

    Make sure you clean greenhouse for winter and if possible, let the frost get in. None of which is ideal if you use your greenhouse year round.

    Best time to add predator mites is around May-June
    carly likes this.
    Death to all slugs!

  5. #5
    carly is offline Sprouter
    Join Date
    Mar 2013
    Location
    oxfordshire
    Posts
    221
    Blog Entries
    8

    Default

    Quote Originally Posted by unclefudgly View Post
    Unfortunately if you get them once they will come back year after year. The only solution that works is to introduce predatory mites as soon as you see them, as it can take 4-6 weeks for the predatory mite numbers to increase to a sufficient level to tackle the infestation.

    Make sure you clean greenhouse for winter and if possible, let the frost get in. None of which is ideal if you use your greenhouse year round.

    Best time to add predator mites is around May-June
    We don’t grow over the winter so we do plan on cleaning the whole greenhouse in November/December. Will the frost help with killing off RSM then?
    I did get some ladybird larvae in end of may but that was mainly for aphids.... which they got rid of in 4 days. I just had some more ladybird larvae delivered 2 days ago and I have put them all where the rsm is so hopefully they will help. We did look at Phytoseiulus but you have to keep the greenhouse within certain temps for them to work under 30 and over 10 and with all this hot weather we wasn’t sure whether we would be able to achieve that so decided to go for the lady bird larvae again.

  6. #6
    unclefudgly's Avatar
    unclefudgly is offline Sprouter
    Join Date
    Sep 2009
    Location
    SW London
    Posts
    195

    Default

    They are horrible little buggers that's for sure. I think it's important to get rid of their hiding places in which they hibernate, so clear all dead leaves, take out all pots etc etc. The less hiding places the better. Apparently the eggs can survive zero degrees but unsure about hibernating adults, so maybe worth a try.

    In Spring I add Amblysieus spider mites, before I even see a spider mite, just hang the sachets around the greenhouse. Amblyseius is active over a much wider range of temperatures than the other type.

    This year I managed to control them a little bit better than previous years by adding predator mites early, and numbers didn't damage my long bean crop too badly, and even the Aubergines survived
    Babru likes this.
    Death to all slugs!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts