Insect netting stops pests by being a physical barrier — and a barrier does not check credentials. The same mesh that keeps out cabbage whites, aphids and squash bugs also keeps out bees, which is why growers hesitate before netting a flowering crop. The honest answer: whether insect netting costs you pollination depends entirely on the crop. Self-pollinating vegetables (tomato, pepper, beans, lettuce) produce normally under a net; cucurbits (zucchini, squash, cucumber, melon) need a deliberate pollination strategy or they will flower beautifully and set nothing. Here is how to tell the difference and the four ways growers pollinate under netting.
Sort your crop list before you buy mesh — it decides whether netting is plug-and-play or a system decision:
| Crop type | Examples | Under a net |
|---|---|---|
| Self-pollinating | Tomato, pepper, eggplant, beans, peas, lettuce | Normal fruit set; a shake of the tunnel or natural air movement does the job |
| Wind-pollinated | Corn, beets, spinach, brassicas for leaf | Unaffected — pollen moves on air, and knitted mesh breathes |
| Bee-dependent (cucurbits) | Zucchini, squash, cucumber, melon, pumpkin | Will not set fruit without a pollination plan — see the four options below |
| Butterfly-pest targets | Cabbage, broccoli, kale, cauliflower | The ideal netting case: no pollination needed, and the net replaces sprays entirely |
The pattern: netting is a free win on anything harvested for leaves, roots or self-set fruit. The pollination question only gets real with the cucurbit family.
Multi-season exclusion-netting trials with organic cucurbit growers produced a clean verdict. In year one, growers netted standard zucchini and summer squash and watched flowers drop unpollinated — the net excluded the squash bees along with the pests. In year two, the same growers switched to parthenocarpic cucumber varieties (varieties that set fruit without pollination) and released predatory mites for mite control under the net — and reported higher yield, better quality, a longer harvest window and more income than their unnetted rows. The growers’ own summary: exclusion netting works for cucurbits, but only if the variety and the pest plan are chosen for it. Nobody in the trial recommends netting standard zucchini. The transferable lesson for any grower: decide the pollination plan at the same meeting where you decide the mesh — they are one decision, not two.
None of these is exotic — commercial growers run every one of them at scale. The choice depends on your crop, your bloom window and how continuous your pest pressure is:
Exclusion netting changes the pest-control economics in a second way that rarely makes the brochure. A netted tunnel is an enclosure for the insects you want as much as the ones you don’t: predatory mites and parasitic wasps released under a net stay concentrated on your crop instead of dispersing across the field, and the pest pressure they face is only whatever hatches inside — not a daily immigration from the neighboring rows. Growers running this combination (netting plus released beneficials) report that the biologicals finally perform the way the supplier’s sheet promised, because the battlefield stopped moving. Add the airflow side: a breathable knit keeps humidity lower than plastic row covers, which means less fungal pressure — so the net replaces a slice of the spray program twice, once for insects and once for disease.
Mesh size sets which insects are excluded — both directions. Our insect and butterfly netting runs 2–7 mm apertures in 30–110 gsm knitted HDPE: the fine end (2–4 mm) stops aphids, thrips and flea beetles; the butterfly grades (5–7 mm, 30–50 gsm) stop cabbage whites and larger moths while passing more air and light. A detail worth knowing when pollinators are part of the plan: a standard honeybee-body aperture is roughly 4–5 mm, so mid-range meshes that block butterflies will slow or exclude bees too — which is exactly why the cucurbit strategies above exist. For the full pest-to-aperture mapping, see the insect netting mesh size guide; for the brassica-specific timing, the butterfly netting guide covers it.
OMB Textiles is a knitted HDPE netting manufacturer in Changzhou, China — founded in 2003, weaving insect and butterfly netting from 100% virgin HDPE with UV stabilization for distributors and growers worldwide. Widths run 1–12 m with lengths to order, so tunnels, hoops and greenhouse walls are all cut-to-spec rather than field-seamed. MOQ is 2 tons with mixed meshes and widths in one shipment — distributors typically stock the butterfly grades and the aphid grades side by side. Production runs 25–35 days after deposit; samples are free, you cover the courier. Send your crop list, tunnel dimensions and destination port via the contact page or WhatsApp — we reply within 24 hours with a mesh recommendation and roll plan. The full range is on the insect net product page.
Yes, physically — mid-range meshes that stop butterflies also stop or slow bees. That is not a flaw; it is the same barrier doing its job both ways. Plan pollination deliberately: self-pollinating crops need nothing, cucurbits need parthenocarpic varieties, a bumblebee hive under the net, or timed opening at bloom.
Yes — both are self-pollinating, and the gentle movement of the plants under a breathable knit is enough for fruit set. Netting them is common practice against whitefly, aphids and fruit-piercing moths.
5–7 mm apertures in the 30–50 gsm butterfly grades stop cabbage white butterflies and larger moths while passing maximum light and airflow. Smaller pests like aphids need the 2–4 mm end of the range — choose by your worst pest, not the average one.
Yes, timed opening works: net until first bloom, open during the flowering window for bee access, reseal once fruit is set. The risk is a reinfestation window — it suits crops with one pest generation to avoid, less so where squash bug or aphid pressure is continuous.
Yes — widths to 12 m and lengths to order, so hoops, tunnels and greenhouse sidewalls are single-piece installs. Send the structure dimensions and we cut to fit; mixed meshes for different bays share one shipment under the 2-ton MOQ.
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