Protecting the collection
The National Herbarium of Victoria's collection of over 1.2 million specimens is an invaluable botanical resource that requires long term preservation. Many of the specimens in the herbarium are over 200 years old. These specimens are an irreplaceable record of plant biodiversity and are used by botanists involved in the fields of taxonomy, systematics, conservation and horticultural botany.
To preserve and protect individual specimens, they are mounted on archival card or placed in a packet. Sheets are filed in folders, and packets are filed in boxes.
Specimens are stored in metal cupboards, designed to minimise exposure to light and temperature fluctuations. To protect against fire, the collections area is fitted with a highly sensitive smoke detector system. A detailed Emergency Recovery Plan outlines procedures to protect and salvage the collections in the event of an emergency.
The destruction of specimens by insects is one of the greatest threats to the collections. Left unchecked, insects can quietly destroy vast amounts of herbarium specimens. We have a number of Integrated Pest Management (IPM) strategies in place to reduce the risk of specimen damage.
Freezing is the main method of insect control and is the safest and most effective treatment. All material entering the collection is treated in the walk-in Herbarium freezer at -23 °C for 7 days to kill any insects or other pests. We also continually rotate the collection through the freezer. It takes about three years to freeze the entire collection.
Additional insect control measures include systematically removing insects such as carpet beetles from known hot spots using a handheld vacuum. Insect blunder traps are distributed within and atop specimen cupboards and are monitored on a regular basis.
Insect sightings within the Herbarium are fully documented. These records can be used to identify patterns in insect activity, which helps us develop more effective strategies to prevent and control insects.
To control insects in some areas of the building, domestic-grade insect control bombs are released each year. The product contains a contact insecticide and an insect growth regulator that is effective for up to three months. The control bombs are used against silverfish, carpet beetles, cockroaches, fleas, spiders, moths and ants. They are activated before a holiday period to minimise exposure to staff.
Pests and Diseases Image Library (PaDIL) <http://www.padil.gov.au>
Destruction of a specimen by cigarette beetle
Procedures are in place for the safe use of the freezer
Trolleys with herbarium specimens inside the freezer
Last updated 19 Apr 2011