Wednesday, June 21, 2017

Wasps for Caterpillar Control

Many people think the paper wasps and mud daubers are a dangerous garden pest that needs to be controlled.  In my view, they are excellent pest controllers, especially for caterpillars.  They catch insects and feed them to their larvae.
These cells will be filled with hungry baby wasps!
I was looking at my hollyhocks, looking for the insect that made web nests like this in leaves and ate the leaves.  Most of the webs were empty, because wasps were systematically locating the nests and eating the caterpillars. The wasps ignored me as they moved from leaf to leaf.
Caterpillars hiding in rolled leaf web.
One of the Painted Lady butterflies, Vanessa annabella West Coast lady
is the probably leaf muncher.  Mallows are one of their main host plants.

Wasps are also patrolling the Four O'Clocks, the tomatoes and the peppers, which have very little caterpillar damage this year.

When would I destroy a wasp nest? Nests in areas where they risk being bumped and bringing the wrath of the inhabitants on me are destroyed when I find them.  The first photo is of a nest that the wasp built in the garden shed, on my weed trimmer.  I destroyed it and hope she found a better place for her next effort.

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