Why plastic greenhouse tunnels are usually fitted with insect nets
1. Physical barrier to pests
- 20–30 mesh screens block >90 % of aphids, whiteflies, thrips, leaf-miners, etc. before they enter through vents or doors.
2. Virus suppression
- About 80 % of vegetable viruses are insect-vectored (aphids, whiteflies). Keeping the vectors out cuts virus incidence by 70–80 %, cheaper and more effective than repeated sprays.
3. Pesticide reduction
- Lower pest pressure means 30–50 % fewer spray applications, saving labour and chemicals and leaving lower residues – essential for green/organic programmes.
4. Micro-climate bonus
- White or grey nets diffuse strong light, reducing mid-summer leaf temperature by ~1 °C and preventing sun-scald.
- They also cut night heat loss in early spring (+0.5–1 °C soil temperature) and soften driving rain, lowering in-tunnel humidity and fungal disease risk.
5. Bird & large-animal protection
- The same mesh excludes sparrows, pigeons and bats that peck fruit or seedlings.
6. Low cost, long life
- Initial outlay ≈ USD 0.05–0.10 per square foot; nets last 4–6 years and can be removed, washed and re-installed without altering ventilation or curtain systems.
In short, an insect net is the cheapest, easiest multi-functional tool available: it keeps pests (and the diseases they carry) outside, reduces chemical use, moderates the greenhouse climate and improves crop quality and marketable yield.
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