Olive Fly (Dacus Oleae)

For discussion, news, comments, questions and information about Crete & Greece.
Peter W
Posts: 45
Joined: Thu Nov 29, 2012 4:24 pm
Location: Near Spili

Olive Fly (Dacus Oleae)

Postby Peter W » Fri Oct 13, 2017 8:05 am

Olive fly infestation seems particularly bad in this area (Agios Vasilios) this year with my own crop devastated, any other olive growers on the forum have a similar problem?

Peter

Jeffstclair
Posts: 964
Joined: Thu Sep 06, 2007 10:00 pm
Location: The centre of the universe

Re: Olive Fly (Dacus Oleae)

Postby Jeffstclair » Fri Oct 13, 2017 10:35 am

Yeah , we have olive moth I don't know if it's more than usual but we have it. Mild dry winters and hot dry summers , tend to make it worse I think ...from what I've read the olive moth over winters in the soil under the trees so maybe after the harvest I may rotivate around them and see if it helps ... I put out ammonia traps in the spring and Eco traps help.... from these people http://www.viorylagro.gr/index.php?opti ... 64&lang=en

What method of control do you use ?

Peter W
Posts: 45
Joined: Thu Nov 29, 2012 4:24 pm
Location: Near Spili

Re: Olive Fly (Dacus Oleae)

Postby Peter W » Fri Oct 13, 2017 4:02 pm

I'm ashamed to admit that through a combination of ignorance and complacency I have not previously taken any action to control olive fly in my olive grove. I tend to be guided by my neighbours who, as fly infestation has not been a major problem in this area recently, don't put out fly traps.

Last year was a big crop from my trees so the loss of the comparatively few olives I had this year is not such a big problem for me, but obviously this has made me think seriously about what I need to do to protect next years crop. I sought advice at my local Agrotica who advised against fly traps, their view was that unless all the other olive growers in the area are putting up fly traps, hanging traps in one grove would simply attract all the flies from the surrounding area - so completely counter productive. They recommended spraying but since to be effective this requires specialist equipment, not the back pack I'm used to using it, would mean bringing in a local contractor - hardly worth it for the 50 trees in my olive grove.

Ignoring their advice and on the basis that following this years heavy infestation my neighbours will put up traps I have decided to use traps in my olive grove in an attempt to control fly numbers.

If your neighbours are anything like mine I'm sure you are getting plenty of advice (often conflicting) about olive tree management, searching the internet a few years ago for more considered advice I came across this site:-

http://www.mediterraneangardensociety.org/olives.html

Although the author Brian Chatterton farms in Italy I have found his advice on all matters olive growing invaluable, if you click on the link you will find his description of a home made olive fly trap which he calls the Ureaka trap. This is the method of control I have decided to use in the future and although it is now too late to save this years harvest I have already made and hung Ureaka traps in my olive grove. If you want to try this method it's worth knowing the Urea based fertiliser he mentions is also labelled 21-0-0 in Crete. I had no problem obtaining the stuff but only in a 15kilo sack so I now have supplies to last the rest of my life. The yellow bottles look very pretty hanging from the trees, I will let you know next year if they are effective!

You will also see that Chatterton has some thoughts on the benefits or otherwise of cultivating the ground around the trees, personally I strim a couple of times a year rather than rotovate but this is for cosmetic reasons rather than any perceived benefit, its also less hassle than getting the rotovator down to my olive grove!

Incidentally, the olive fly infestation in this area is so bad that the local Dimos is funding a contractor to tour the villages spraying olive groves at no cost to the owners, he is apparently due to cover our village on Tuesday and I have been advised to leave my olive grove open.

On a slightly different subject, I don't know how you harvest your trees but in January this year I decided to harvest entirely by hand, not for any other reason than I wanted to enjoy the experience without a generator buzzing away in the background and I wanted a more 'traditional' harvesting experience. Of course it took longer but with only 50 trees that's not major consideration. However, I would not harvest in this way again, thrashing the trees with those four-pronged beaters causes far more damage to the trees than the mechanical method and I notice that now the olive knot disease has spread more quickly on the new growth, I'm pretty certain through spores getting into the wounded branches. Could be just a coincidence of course but its back to the generator for me in future.

Good luck with this years harvest.

Peter

Jeffstclair
Posts: 964
Joined: Thu Sep 06, 2007 10:00 pm
Location: The centre of the universe

Re: Olive Fly (Dacus Oleae)

Postby Jeffstclair » Fri Oct 13, 2017 5:05 pm

Oh, I've been making the bottle traps for a few years now and they do work , I don't paint the whole bottle yellow just the top half , so I can see the little black olive moths ... and it easy to see the thing has not dried out ....I use copper or bordeaux mixture for the olive knot and generally add a foliar feed in the spring .... until recently I did it with a back pack sprayer now I have a 12 volt electric system that runs off the truck .I try not to use any chemicals/ insecticide on our veg plot , wine grapes , olive trees .Most folk around here use far to much of this stuff imho , but I'm just a hobby farmer and don't need the crop to earn a living . The Dimos here also send spraying teams out to spray olives 6 guys in a truck with back pack sprayers , but they are not very thorough ...and seem to just pick a spot at random ....they have never sprayed mine ...thankfully ...
The battering the olives off by hand is very hard work , and I also don't like a 12 volt genny next to me clattering away all day .. what we do is have a small 1k 240 volt genny that I leave 50 ( sometimes further )metres away from were I am working , then I plug in a little twelve volt transformer with the speed control and connect the vergers to that ..... and good luck with your harvest ...jeff

Peter W
Posts: 45
Joined: Thu Nov 29, 2012 4:24 pm
Location: Near Spili

Re: Olive Fly (Dacus Oleae)

Postby Peter W » Sat Oct 14, 2017 8:12 am

Thanks Jeff, useful advice.

Peter

moved 2 crete
Posts: 743
Joined: Mon Mar 15, 2010 1:37 pm
Location: chania

Re: Olive Fly (Dacus Oleae)

Postby moved 2 crete » Sat Oct 14, 2017 9:16 pm

Maybe I am lucky but no problem with olive fly I as get local chap to spray once a year, We only have 45 trees but on very sloping ground so have contracted a local farmer this year having reached the age of 78 and now finding trying to be a mountain goat beyond my ability, he has agreed to harvesting them for half the olives and the wood from cutting the trees, so all being well I have agreed to this and look forward to a good harvest some money and oil from our trees, it looks like a good harvest this year and for the first time my partner and I can relax and enjoy the rewards from our trees... :D
Dave H


Return to “General Discussion & News”

Who is online

Users browsing this forum: No registered users and 3 guests

cron