Well, it's working pretty good as of near sundown. I went out in the pasture and there's about 70 percent fewer hoppers flying around. Supposed to get much higher kill after 2 or 3 days. This is Sevin SL, not regular Sevin. SL is an ag/industrial level with twice the carbaryl as regular Sevin.
Shake the hell out of and mix it in good. I said 2 qts. an acre, but it was probably closer to 1.5. The label recommends 1 qt. for "range land" and 1.5-2 for thick grass pastures. But that's the full-coverage calibration. The actual spraying was a 10-foot swath (the width of the boom) with about 15 feet between swaths. Doesn't have to be exact. I know some people make their swaths much further apart.
They will tend to concentrate in the higher, uncut growth. That's why you saw fewer hoppers after you shredded.
One of my main concerns is the areas where I can't really go with the tractor; some rocky, cedar-infested areas, gullies, etc. A couple areas with big boulders and broom/rag weed up to your chest. I think for some of those I'm just going to park there and switch to the hand sprayer. But some places I just won't bother with.
There's also the neighboring property. On my north border is a pretty much abandoned plot, 95 acres of cedar, johnson grass and miscellaneous weeds, and a quadrillion hoppers. On my south border is my neighbor's place - he doesn't do much with it, it's most thigh-high broomweed, also full of hoppers. I'm thinking of really spraying heavily along those fencelines.