Author Topic: fungicide use as a preventative  (Read 19608 times)

John Kirby

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Re: fungicide use as a preventative
« Reply #15 on: September 06, 2011, 07:13 AM »
Own,
We have tried Kontos (systemic, well maybe) as an early season starter and then use Avid, Forbid and Bifenthrin. Avid and Forbid are restricted, but with single use per year can really restrict the population. Several claim to affect all life stages, but like you have pointed out, none truly seem to be truly spanning.  Vegetable oil can work, you need to really emulsify it to prevent all of the oil solubles from being restricted to hydrophobic globlules.

John
 

Chrisl

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Re: fungicide use as a preventative
« Reply #16 on: September 06, 2011, 12:08 PM »
Thanks Chris for those dilution rates!

I didn't know also I should be rotating my fungicides.  Just been using Daconil.  I'm ordering some copper fungicide today.

Oh, I've been using Ortho Max flower, tree and vegetable  insecticide.  Is the bayer 3 in 1 better, or is this Ortho Max good to cover the borers as they all seem to do scale? 
 

John Kirby

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Re: fungicide use as a preventative
« Reply #17 on: September 06, 2011, 05:00 PM »
Look, if you don't see a problem and you don't live in a wicked environment for fungus, then just pay attention and treat. In a commercial setting lots of pretreatment just because of the numbers, density and frequency of dealing with each individual tree. I wouldn't worry about it, spray with lime sulphur before you put them for bed in the winter, once more later in the winter and deal with any problems that might arise.
 

Chrisl

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Re: fungicide use as a preventative
« Reply #18 on: September 06, 2011, 08:32 PM »
It's been a very wet summer and fall so far here in Chicago.  So far this year I've had powdery mildew, scale and needlecast, though one is a on a plant I just bought recently.  Any reason that we don't use lime sulfur spray year round?   We've discussed all these other treatments, so I'm just trying to 'get the  big picture'
 

Owen Reich

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Re: fungicide use as a preventative
« Reply #19 on: September 07, 2011, 06:01 AM »
Like sulphur can be phyotoxic (fry the leaves) especially on deciduous trees.  Kontos is a systemic and reliable by either foliar spray or soil drench.  I prefer a drench and also like Imidacloprid.  Avid is a great miticide especially for hinoki and arborvitae.  The real trick is to scout for potential issues before they hurt your bonsai.  My ABS Journal on Mizu Goke (chopped sphagnum moss) covers monitoring for root fungus issues a little.  Borers are hard, if not impossible to scout for as it doesn't take long for one to lay an egg and fly off.  Traps are a great way to let you know they are already in the area ; ) hence the preventative trunk spray.  Arbitrary applications of chemicals to a small bonsai collection is wasteful and a hassle.  Commercial production of a monoculture of anything is a numbers game and preventative spraying is just protection of an investment.  I should be more clear on that in the future.  My bonsai collection was in the middle of thousands of other plants where i used to work so I sprayed them regularly because it took very little time.  Bayer 3-in-1 works well.  I used it because I prefer Imidacloprid for the systemic action and diversity of pests that die when they suck or chew on my bonsai. 

On a final note, it may be a good idea to look into 100% inorganic bonsai mix for your conifers if not already in use to avoid water-logged soil.  I have seen people use styrofoam fish crate lids (cut in half with a hole for the trunk) to keep their tree dry during the rainy season and then reuse for winter insulation before.  Not something I'd do for a whole collection, but perhaps for a temperamental or recovering tree or two.   
 

Chrisl

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Re: fungicide use as a preventative
« Reply #20 on: September 07, 2011, 10:31 AM »
Thanks Owen for explaining that.  I knew there had to be a catch on the lime sulfur spray ;)  And that's a good idea to protect from exc. rains....esp. for my Ponderosa Pine.  And I have the perfect styrofoam lid in mind, just glad I didn't throw it away last week when I was supposed too lol
 

coh

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Re: fungicide use as a preventative
« Reply #21 on: September 18, 2011, 11:13 AM »
Follow-up regarding the pre-mixed daconil/sprayer problem, for anyone interested. I picked up a small pressure sprayer and filled it with the pre-mixed daconil that wouldn't spray well in the original sprayer. It still didn't work very well. There's something about that pre-mixed stuff, it just seems way too thick to use effectively.

I then picked up some of the daconil concentrate and mixed my own...filled the pressure sprayer and no problem, worked like a dream.

So bottom line...save yourself some headaches and just get the concentrate! Avoid the crap that comes pre-mixed at Lowes and Home Depot.

Chris