Leaf-cutter bees are solitary bees. They do
not form colonies and do not produce honey. They are a large cosmopolitan group
of insects which consists of about 1,500 species. in In Maltese the common
leaf-cutting bee is known as mqass
tal-weraq.
Leaf-cutter bees are important pollinators
of both wild and cultivated plants. A leaf-cutting bee is a much better
pollinator than a honey bee.
They build their nest in sheltered places
usually in natural cavities in the ground, on rock faces or in hollow twigs.
The nests are lined with disk-shaped pieces of leaf or petals which the female
cuts using her large mandibles. It is thought that the leaves and petals
maintain a higher humidity inside the nest. This prevents the stored food from
drying up.
A typical nests consists of a tunnel with
columns of cells along it. The female lays an egg in each cell, supplies it
with food which usually consists of pollen which is sometimes mixed with nectar
and then seals the egg and food inside.
The male larvae hatch before the female do but
they die shortly after mating while the females live several weeks more during
which time they build a new nest and lay eggs in each one of them.
Leaf-cutter bees can sting and will do so to
defend themselves but their sting is much less painful than that of the honey
bee. A tell-tale sign that gives away the presence of leaf-cutter bees are
circular patterns cut in leaves. These can be found in a variety of plants but
are not of concern even when the leaves belong to cultivated garden plants.
All bees and wasps are highly beneficial
insects and should never be considered as pests. The presence of these and
other bees and wasps is an indication of a rich biodiversity. They should be encouraged
to build their nests in your garden by providing them with suitable nesting
cavities. These can be made of short lengths of reed or cane tied together in
bunches and placed in sheltered parts of the garden. Canes of different
diameter are likely to attract different species of bees and wasps.
This article was published in The Times of Malta on 28 August 2014.
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