We have not heard that a black plastic cover will eliminate bugs. The Sun will warm the soil, but not as much as you think, even in Florida. According to the Univeristy of Massachusetts Center for Agriculture,
The most widely used, available, and inexpensive of the colored mulches, black plastic mulch has excellent weed suppression ability because of its opacity. It is also useful for warming soil during the growing season, particularly if as much of the plastic as possible is in contact with the soil below. Research at Penn State has shown that soil underneath black plastic can be up to 5 °F warmer at a 2-inch depth and up to 3 °F warmer at a 4-inch depth than uncovered soil at the same depths. This means that plants can be set out earlier than on bare soil, and may result in earlier maturing fruit. For example, collaborative trials between US Department of Agriculture and Auburn University indicate that okra crops mature earlier with higher yields on black plastic than on bare soil.
We have not heard that a black plastic cover will eliminate bugs. The Sun will warm the soil, but not as much as you think, even in Florida. According to the Univeristy of Massachusetts Center for Agriculture,