Tag Archives: zucchini

Squash Vine Borer Life Cycle – and Control Methods

Anyone interested in the life cycle of the squash vine borer or how to recognize it at each stage?  It’s probably not quite what you think.  I am including a photo library below for your visual pleasure.

The squash vine borer (Melittia cucurbitae) is a moth.  The most surprising thing is that it looks nothing like a moth, it looks more like a fly and it’s far more attractive than you’d expect for such a malicious monster.  It’s like a wolf in sheep’s clothing.

The fly lays it’s eggs on the squash plant itself, usually on the stem but can be on a leaf, within a couple of inches of the soil.  After the eggs hatch, the “caterpillars” (maggots!!!) burrow into the stalk of the squash plant.  The only evidence of this happening is a patch of yellowish brownish fine sawdust looking stuff that gathers below the hole in the stalk made by the squash vine borer “caterpillar”.  Once inside, the squash vine borer eats the stalk from the inside out.  Most gardeners discover the invader when leaves turn brown, shrivel up, and fall off.  It’s almost 100% too late at that point.