cross-posted from: https://lemmy.world/post/17588319

[Image description: a thicc green hornworm hanging onto the stem of a tomato plant. The hornworm is speckled with little white dots, has eyespots and angular white stripes down his side, and the namesake sharp little spike of a horn on its butt.]

  • The_v@lemmy.worldEnglish
    4·
    5 months ago

    Putting out the assassin bugs with the predatory mites is not a good idea. They are indescriminate hunters. They also tend to fly away. They do a better job on aphids and whiteflies in my experience.

    The G. occidentalis usually only works in cooler temps below 90F. Above that their populations crash. They are awesome in a temperature controlled greenhouse.

    N. californicus can take the heat but need high levels. This is why they work in corn. Apply them at tasselling and they reproduce on the corn pollen rapidly. They then can suppress spider mites for the rest of the season. Otherwise you are left releasing every 2 weeks for the rest of the season. It works but it’s expensive.

    • thrawn@lemmy.worldOPEnglish
      2·
      5 months ago

      That’s a fair point, didn’t consider that my generalists would probably also be happy snacking on my good guys. I released them along with the G. occidentalis back in May when it was much cooler, in the hopes of preempting the spider mite spread.

      The N. californicus I released in mid June, and though I didn’t happen to grow any corn in the garden this year, hopefully the volume of spider mites is enough to keep them well fed.