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UC Cooperative Extension Ventura County
669 County Square Dr. Suite 100
Ventura CA 93003
Phone: 805.645.1451
Fax: 805.645.1474

Office Hours
Monday - Friday from 9 a.m. to 4 p.m. 
Please phone ahead as staff schedules vary due to COVID-19.
We are also available via phone and email. 

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Leafcutter Bees

These are the little grayish-black bees that cut circular notches out of the leaves of your rose bushes, bougainvillea, and other plants. It seems that once they decide on a particular plant, they can almost defoliate it by their cutting activities. I have seen bougainvillea plants completely denuded of flowers by leafcutter bees. Since these insects are very useful as pollinators for many plants, I suggest sparing the spray if at all possible. On the other hand, if leaf removal becomes so severe that the life of the plant is threatened, a spray of insect repellent should discourage further leaf removal.