Here's an update on Surround Crop Protectant:
There are two varieties. One, called Surround WP, is a wettable powder that is sold for commercial application. The other, called Surround at Home, is sold as a home-owner product. I think it too is a wettable powder. Both are described to be suitable for either a piston or diaphraghm pump, and both are described to be entirely non-toxic to humans and friendly/benefical critters. They both work by making getting at the fruit more trouble than it is worth for the insects that would normally make a diner out of your orchard. A sprayed orchard looks like it has been covered in frost. In addition to keeping critters (especially Plum Curculio) at bay, Surround is described as keeping the surface temperature of fruit several degrees cooler, helping to reduce sunburn. It rinses off with water, which is a blessing and a curse. A mere rinse under running water, and your apple is ready to eat. This same property, though, results in the need to reapply every 7 to fourteen days, depending on how much it rains. In the event of heavy rain, it is essential to reapply immediately.
Application rate is 6 - 12 pounds per acre, depending on the density of trees and fruit. It costs $80 for 25 pounds at GardensAlive.com.
It is said to work well on pears and other tree fruit, as well as grapes and plain old gardens. It is mixable with fungicides and other chemicals - if those are things you need.
So, here's where I'm going:I bought a SOLO backpack sprayer, a couple of cheap disposable rubber-coated hooded overalls, air-tight goggles, booties, some latex gloves, and a couple of disposable p-100 half-face respirators from Gemplers. This is overkill, I suppose, for non-toxic products, but I don't want to get clay (Surround) or Oil (Oil Away) in my lungs. The cost of the protective gear was less than a hospitalization co-pay ... so ...
I bought 25 pounds of Surround at Home and two gallons of Oil Away insecticidal (soap-based) spray from Gardens Alive. I will spray oil next weekend, then at bloom, and then at petal fall. The week after petal fall, I will spray with Surround, and do the same about every two weeks and after heavy rains. I'll report as things progress and at harvest time.
Thanks for all the tips! If it works out well, anyone in my neck of the woods is welcome to stop by and pick his/her fill.
Regards,
Jim