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What is this on Rosemary?

I've looked at other forums and I believe it to be either sclerotia or psuedonomas or a blight infection. (Based off another forum and another website.)This is the first time I've experienced this and we've owned this plant for years. Could a pesticide work on it? It's not on all of the plant but it's turned some lower branches brown. It's in a raised bed near other plants so could it spread to other plants? (Near it I've planted Spring onions, chives, carrots and beetroot.) Also, there is a new Rosemary plant next to it but it doesn't seem to have any of that on it. Any help is appreciated.


  • pansyfacepansyface Posts: 22,693
    The brown splodges, you mean? I think those are pupae of some kind of beetle. (That is the third stage of a beetle’s lifecycle, after the caterpillar and before the adult beetle.)

    I say they may be the pupae of rosemary beetles, but I’m not certain. They may be the pupae of some completely innocent beetle that just happened to find a nice quiet spot to change from its caterpillar form to its beetle form.

    So before you go blasting your plant with stuff, maybe take a little time to wait and see what they turn into. Could be something lovely.
    Apophthegm -  a big word for a small thought.
    If you live in Derbyshire, as I do.
  • BobTheGardenerBobTheGardener Posts: 11,391
    The brown blobs look like very pregnant scale insects to me.  If white 'fluff' appears at one end in the next few weeks, that would be a definite.  Some here:
    If so, physical removal by hand is the easy, if messy, answer.

    A trowel in the hand is worth a thousand lost under a bush.
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