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Updated: August 31, 2024
It was found, however, that back from the seacoast this insect did not seem to thrive with the same vigor, and the black scale held its own. Then a spirited controversy sprung up among the olive-growers, those near the seacoast contending that the Rhizobius was a perfect remedy for the scale, while those inland insisted that it was worthless.
He found and successfully introduced another ladybird beetle, known as Rhizobius ventralis, a little dark-coloured creature which has thrived in the California climate, especially near the seacoast, and in the damp air of those regions has successfully held the black scale in check.
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