Whitefly

This topic contains 10 replies, has 0 voices, and was last updated by  Darren 7 years ago.

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  • #15294

    Jacqui
    Keymaster

    I am getting low on milkweed and have quite a few caterpillars coming on. Some of my plants have been hit with whitefly and consequently honeydew.

    There are some tips here:

    https://www.monarch.org.nz/forum/tags/whitefly

    ;

    but I wonder if anyone else has any thoughts on this tricky subject.

    Not much point in getting a biological control, methinks, with winter coming on. It’s only an isolated problem.

    Does anyone near me (Blockhouse Bay) or even South Auckland Franklin/Waikato (going there next week)have cuttings of Helichrysum angustifolium (curry plant) I could have? I’d like to plant this near my plants as this is said to be a control.

    http://tinyurl.com/7wsmbek

    ;

    Have also sprayed with Aquaticus, hope that will help. It’s a seaweed/fish spray, thick and gluggy, almost like marmite, and doesn’t smell any nicer. :) Container is downstairs otherwise I could give you more info. about it. If (when) I get near a beach I’ll give the plants some seaweed chopped up too. Probably overdo it…

    Anyway, would welcome ideas from others.

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  • #30332

    Darren
    Participant

    Bernie, yes Aphis nerii Boyer de Fonscolombe, also known as the milkweed aphid, and oleander aphid. Commonly described as a yellow aphid.
    https://www.monarch.org.nz/other-species/factsheets/pests/aphis-nerii-milkweed-aphid-or-yellow-aphid/

    #30331

    Terry
    Moderator

    It looks like summer is still on hold at the moment Bernie as the long term forecast is for Sunshine at the weekend and possibly Monday then rain the remainder of next week,

    http://uk.weather.com/weather/10day-Margate-UKXX1051

    #30329

    Bernie
    Member

    I presume by the milkweed aphid,you mean the yellow one Darren.At the moment I am having to use all my milweeds to feed my cats ,soI haven’t got enough to use a control,so I will postpone the test for a few weeks until the Summer actually begins here in GB!!My friend Don,who only lives a few miles from me has no problem at all with the yellow ones.

    #30326

    Darren
    Participant

    I tested French Marigold (Tagetes patula) and Mexican Marigold (Tagetes erecta) as deterrents to the milkweed aphid. They were certainly more effective than chives, but on the scale of my test I couldn’t say if they were any better than the control.

    #30258

    Bernie
    Member

    http://www.bbc.co.uk/gardening/basics/techniques/organic_companionplanting1.shtml

    I have been trying to think of where I first got the info about Tagetes from and I think it was from a book.I then “googled” “companion plants” and came up with loads of sites.Here is one link out of many.

    #30257

    Jacqui
    Keymaster

    Thanks Bernie, I will take these potted plants around to where I have Tagetes growing. Hopefully that will help.

    #30254

    Bernie
    Member

    Yes Terry,you are correct it is tagetes.I can’t remember where I got the info from but I have been using them for years now.They serve a dual purpose as nectar plants(the yellow one is best as a nectar plant)as well.I can honestly say that I now never have any problem with whitefly in the greenhouse since I have been using them.I wish I could say the same for the yellow aphids which affect the potted milkweeds!!.Thinking about it though,I will confine a marigold with the next milkweed that has this yellow aphid and see what happens.

    #30253

    Terry
    Moderator

    Wow! That’s a good one Bernie! I had a problem a couple of years ago when the whitefly nearly killed my 2 lantana camara bushes in the Butterfly House. I got rid of them by increasing the humidity and drenching the plants every day, a tip I received from a local horticulturist. I wish I had known about the Marigolds, And I think I would be right in guessing you mean Tagetes species, African and French marigolds?

    #30252

    Jacqui
    Keymaster

    Which marigolds, Bernie? Calendula or Tagetes?

    #30251

    Bernie
    Member

    I find that growing marigolds near the plants keeps whitefly away,certainly in the confines of my greenhouse.

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