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Hi my second year veg growing ... My Greenhouse  is full of new seedilings doing well except green and black fly.  Ive tried Organic bug spray ... plants that are companion plants in pots in the Greenhouse .... Yellow stickies to grap the flies as they pass but still the little blighters persist ... Need your help very much a novice

Thank you my friends



Have you tried the soap sprays!  Based on fatty acids I think.

Black fly are easily removed between finger and thumb.  Often they are on the new growth tips so should be able to control them. On seedlings be more gentle though.

Are the seedlings edible crops?  If not you could use a systemic insecticide. and green fly are not really difficult to control.

Just a thought, but when you use your organic spray did you spray under the leaves, around the trays or pots and even under them?


Yes they are mostly edible Verdun.  No just a quick spray on top of leaves.  Will do under and around trays.  mmm Soap sprays I will have to check this out too

Thank you for your Help Verdun

Much appreciated


Ok ging....avoid chemicals then.  

cheers Verdun



Could you not move them outside for a few days and let the predators move in? No chance of frosts now. 

Have moved some of them out ... I was hoping the companion planting would work

I thought the Green house was more of  protection but the little blighters still found them.  All seems calm with the soap wash at present will need to keep this up. Vedun how often to I need to do this?

thank you all



As and when with the soap sprays Ging.  You can jet them off just with water but not advisable when it's delicate seedlings! Fine with more robust shrubs and perennials etc. Apparently it makes the little b*****s explode....

Fairygirl, called Verdun now?

As and when with the soap sprays Ging.  You can jet them off just with water but not advisable when  It's delicate seedlings!  Fine with more robust shrubs and perennials erc.  Apparently it makes the little b********s explode......'o')


I get rid of greenfly &c. with cayenne pepper in soapy water - always worked so far

thats interesting will try that one if they persist ... thank you partridge I realised that although Green houses like moisture so do the pests

Do you all throw water on the concrete ground in your Green house to keep it at a good moisture level in the sun ?? This was a tip I heard

Spraying the floor will keep up humidity levels, keeping a watering can full in there will also help with humidity.

thank you Zoomer sorry didnt respond before email didnt come through xx


I always plant Tegetus plants between my tomatoes in my greenhouse, they look quite nice, smell of fox when brushed against, but most of all for the last 3 years i have had NO white fly, bought some sticky strips and hung them, but no flies on them .before i always had clouds of white flie, 

Thank you for the tips potting shed and Smokin Donkey will try them out.


After trying lots of different methods of trying to get rid of these pests, I've finally found something that worked for me ( and other people who've tried it )

I put an inch deep layer of vermiculite on top of the soil in the pots and hung a sticky trap near the plants to catch the active flies, they take about two weeks to clear altogether using this method so be patient.

I believe this works because the flies don't lay their eggs in the vermiculite and they don't dig through it to the soil.



Is this for fungus gnats Lurex? 

Great to be able to deter them 


i have been given some seeds to a plant called "the shoofly plant" and i have been toldif you grow one in yr greenhouse it keeps them away. hence the name.. i will be tryingthis out next year.. i have seeds if nayone wants some.