From what I understand, it's not so much the chemical on the seed, but the powder seed lubricant and the way newer planters operate. Talc or graphite or a combination is dumped in with the seed in the planter. Then, the seed is moved to the row units through tubes with air pressure and the exhausted air contains seed lubricant and some residual chemical that can become airborne. I don't think anyone can say with certainty that this is causing hive collapse, but it's another theory. Canada has outlawed normal talc and graphite seed lubricant, and they're using a fluency agent now that is less likely to become airborne. Made by DuPont, I think. Corn seed has been treated with pesticide and inoculant for a long time, it's just not become airborne quite as easily until recently with the advent of center-fill planting equipment. I suppose treated soybean seed and treated wheat seed through an air seeder would have the same risk. Anyway, that's just what I remember reading.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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