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I’m wondering if there’s something wrong with my swan plant (a new one flowering for the first time this year.) I have observed several caterpillars grow to full size then become moribund. This morning I found a big one whose progress I’d been observing lying dead on the ground under the plant. It was about due to pupate. A week ago there were a lot of tiny caterpillars all over the plant, but now they all seem to have disappeared. Although I’ve killed a couple of wasps, they have been scarce this year, and I’m always on the lookout for any predators on the plant. I guess it’s possible that there are a lot more wasps that turn up when I’m not around, but last year I saw and killed many, in the end resorting to covering the plant with a fine mesh. Early in the season I located and destroyed a half-made paper-wasp nest, and killed its maker, and I think that has mitigated the wasp threat.
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