Are there instructions on when to clean the holes? It’s hard when different species of bees and wasps nest in drilled holes, because then they emerge at different times. Cleaning the holes out after all the spring bees leave their nests might mean that species still in their tubes get kil...
Cock MJW, van Lenteren JC, Brodeur J, Barratt BIP, Bigler F, Bolckmans K, Coˆnsoli FL, Haas F, Mason PG, Parra JRP (2009) In: The use and exchange of biological control agents for food and agriculture, Report prepared for the FAO genetic resources commission by the IOBC global ...
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