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If they are seedlings growing in flats indoors under lights, it could be fungus gnat larvae or a fungal disease causing damping off. If you see tiny gnats hovering over the surface of your potting soil, these are fungus gnats and their larvae can destroy the roots and stems of you seedlings. Here are some tips to help control fungus gnats: http://www.viette.com/v.php?pg=978.
Damping off caused by fungal infection can be controlled by using sterile potting media and reducing your watering, letting the soil surface dry out before you water again. Damping off can also occur when seeds are sown directly outdoors too early in the season when the soil is too cold for optimal germination and growth. Wait for the soil to warm up before planting your seeds. The minimum soil temperature for optimal squash seed germination and growth is 60 degrees. Wait until the soil is at least this warm or warmer before direct sowing squash seeds in the garden.
If the squash seedlings are growing outside and they are breaking off at the soil surface, the problem may be cutworms. These caterpillars feed at night and can chew stems of many different young plants right off at the soil surface. Here is some information on cutworms: http://viette.indigofiles.com/Cutworms.pdf.
If these are mature squash plants, it could be squash vine borers but it seems very early for these to be out. Here is some information about controlling them: http://www.viette.com/v.php?pg=761.