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Posted by Michael Phillips 
June 18, 2017 01:49PM
One of the products touted by Marrone Bio Innovations is Grandevo, which I've have mentioned previously as a promising option for moths. Yet I never had reason to trial this organism product (being the microbial response of Chromobacterium subtsugae to fermentation) since pure neem oil already keeps codling moth and company in good stead, by which I mean low pressure, here in my northern New Hampshire orchard.

New information has been added to the product literature. Listed among targeted insects are San Jose Scale, Apple Maggot Fly, and Spotted Wind Drosophila. Indeed. This would be the material to rotate with spinosad to protect berries when SWD comes through at the height of summer. There's also a study showing activity on flea beetle (for ornamentals) which suggests to my mind other possible small beetle prospects. Mix things up and who knows?

The spray I just did was directed principally at Oyster Shell Scale (a species guess on my part) which has become relevant in the interior of my older trees. Now is purported to be good timing for scale as these insects come out of barnacle-mode and into the crawler stage in order to mate around this time. I included 1/2# of Grandevo (low rate), 2 ounces of Entrust, and 10# of Surround as part of the spray mix, being a half tank's worth, knowing curculio is still on the prowl. I used this on the plums and throughout the interior of the bigger apple trees. Additionally, I covered a hedgerow of highbush cranberry where the Viburnum Leaf Beetle is back for a second season of total destruction. Fingers crossed on that last one.

Let's weigh in how Grandevo actually does, folks. I'll definitely expect reports on its use for SWD. Keep in mind that as promising as all this seems, I've never heard anyone speak to its use as yet.

Lost Nation Orchard
Zone 4b in New Hampshire
Re: Grandevo
June 18, 2017 09:10PM
Ordering now, will report. Rookie question: the application rate is 1-3 lbs per acre. But it's saying that assumes 100 gallons of liquid? 100 gallons of liquid per acre on berries seems very excessive. How am I understanding this wrong. If if scale down the 1-3 lbs per 100 gallons of water to volume that gets the canes in an acre just to the point of runoff, I will be putting less Grandevo on the crop than 1-3 lbs.

Second question: should I be concerned with pest immunity build-up? If so, what to do about it?

Roan Highlands Farm 6b, Roan Mountain, TN elevation: 3200 ft.
Re: Grandevo
June 19, 2017 07:21AM
The amount of water needed to fully wet a crop-acre can be 50 gallons, 100 gallons . . . or it can be the 300 gallons long assumed necessary for standard-size trees. You know what you need for what crop, thus the given rate is provided in terms of so many pounds per acre. I approach this from having a 100-gallon spray tank, and often, but not always, that's sufficient to wet the "average tree acre" here in my orchard. Grandevo offers a significant range when it states 1# to 3# per acre. I chose the low end to start in part because I had another active ingredient in this tank mix in spinosad. We absolutely need to rotate materials to lessen the odds of building up pest resistance. The limitations on the Entrust label make that very clear. That's done by Mixing Things Up which could easily be a thread in its own right. Let's keep this one for Grandevo and field results thereof.

Lost Nation Orchard
Zone 4b in New Hampshire
Re: Grandevo
June 22, 2017 02:17AM
I don't have personal experience with Grandevo, but I was just last week speaking with another local organic apple grower and he said he had recently used it. I thought he said he was trying to control aphids with it because we are having a bad aphid year, but we were also talking about leaf rollers so it might have been for that. He was unimpressed with it.

I have never heard of it for SWD. We sprayed our blueberries for the first time ever today (in five years) after finding the first larvae. We use the Naturalyte GF 120 which is the spinosad bait. It has no pre-harvest interval and just needs to be applied at a spritz per plant as an attractant rather than full coverage. However we need to keep doing it twice a week. The threat is so bad that I would be very reluctant to switch to Grandevo without a strong firsthand recommendation from someone who used it. Luckily we only have two weeks of harvest left out of six week cropping.

Fruitilicious Farm
Zone 9b in California
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