Flies In Plastic Greenhouse . Don’t reach out for chemical pesticides. Postby phill » wed jul 20, 2011 6:09 pm. Insect Screen Net Green Anti Mosquito Mesh and Greenhouse Insect Mesh from shopee.ph Snug some plastic wrap around the top and poke 1 or 2 very small holes. Some plants are frost hardy and will be able to withstand subzero temperatures. A new biotype of b.