How can I clean the interior of a polycarbonate greenhouse in spring to remove powdery mildew, fungus, and spider mites? - briefly
Apply a dilute hydrogen‑peroxide (3 %) or mild soap solution to clean the polycarbonate panels, then spray horticultural oil or neem oil on plant foliage to eradicate mites and suppress fungal growth, and ensure strong ventilation to lower humidity. Repeat the process weekly until symptoms cease.
How can I clean the interior of a polycarbonate greenhouse in spring to remove powdery mildew, fungus, and spider mites? - in detail
Begin by emptying the greenhouse of all plants, pots, tools, and loose material. Sweep or vacuum the floor to eliminate dead leaves, compost residue, and soil clumps that can harbor pathogens. Wear a dust mask, gloves, and protective eyewear to prevent exposure to spores and mites.
Prepare a cleaning solution that targets both fungal growth and arthropod pests. A mixture of 1 % hydrogen peroxide and warm water effectively oxidizes mildew without damaging polycarbonate. Add a few drops of horticultural oil (e.g., neem or mineral oil) to the same solution to increase mite toxicity. For severe infections, supplement with a copper‑based fungicide at the label‑recommended rate.
Apply the solution with a soft‑bristled brush or a low‑pressure sprayer. Work from the top of the structure downward, ensuring thorough coverage of panels, ribs, and framing members. Scrub visible powdery patches until they disappear; avoid abrasive pads that can scratch the polycarbonate surface. Rinse with clean water using a gentle flow to prevent water pooling.
After washing, address spider mites directly. Spray the oil‑enhanced solution onto leaf surfaces and the interior framework, maintaining a wet film for at least 15 minutes. Repeat the treatment after 7 days to disrupt the mite life cycle. For persistent infestations, introduce a predatory mite species (e.g., Phytoseiulus persimilis) once the environment is dry.
Allow the greenhouse interior to dry completely. Open doors and vents, use fans if necessary, and monitor humidity levels, keeping them below 70 % to deter future fungal development. Once dry, reinstall benches, pots, and equipment. Conduct a final inspection for remaining spores or mites; repeat spot‑treatments if any are detected.
Implement preventive measures: install a drip‑irrigation system to keep foliage dry, schedule weekly inspections, and apply a thin coat of horticultural oil quarterly to maintain a protective barrier on polycarbonate surfaces. These actions sustain a clean interior and reduce the likelihood of recurring mildew, fungal, and mite problems.