Pear Trees Under Insect Netting: Protecting Fruit While Keeping Pollinators Working

Netting Pears Without Locking Out Pollinators

Insect netting has become a standard tool for home pear growers, mainly to keep codling moth, pear psylla and birds away from developing fruit. The appeal is obvious: a physical barrier means fewer sprays, less damaged fruit and cleaner harvests. The complication is equally obvious. Pears are not self-fertile in most cases, and they depend on insects, chiefly honeybees and mason bees, to move pollen between cultivars. Net the tree too early or with too fine a mesh, and you shut the door on the very visitors that set the crop.

The honest answer is that pear netting is a timing and mesh decision, not an all-or-nothing choice. You can protect fruit and still get pollination, but only if you understand what the net is doing, when the tree needs open access and what the mesh size actually excludes.

Why Pear Pollination Is the Bottleneck

Most pear cultivars are self-incompatible or only partially self-fruitful. A Conference pear will not reliably pollinate another Conference pear, and even partially self-fertile types set better with a compatible partner nearby. Pollen has to move from the anthers of one cultivar to the stigma of another, and wind does very little of that work in pears. Bees do it.

That means the flowering window is the critical period. Once petals fall and fruit begins to swell, pollination is finished for the year. The tree no longer needs insect visitors in the same way, and the case for covering it strengthens. A net that stays up through bloom, however, can reduce bee access, especially if the mesh is fine or the tree is enclosed tightly with few gaps.

What the net can and cannot do

• It can physically exclude larger insects, birds and some moths if the mesh is fine enough and the enclosure is sealed well.
• It can be opened or removed during bloom so pollinators pass freely.
• It cannot guarantee pollination if there is no compatible cultivar or no bees working in the area.
• It cannot replace the need for a second pear variety in most gardens.

The Mesh Question: Fine Enough for Pests, Open Enough for Bees

Insect netting is sold in a range of mesh sizes. The practical distinction is between bird netting, which has large openings and stops birds but not insects, and fine insect mesh, which can exclude small pests but also restricts some pollinators. Honeybees and bumblebees are relatively robust and can pass through coarser insect mesh; smaller solitary bees and hoverflies may struggle with finer grades.

For pears, the target pests during the growing season are usually codling moth and pear psylla, plus birds and wasps later. A mesh fine enough to exclude codling moth is also fine enough to obstruct many pollinators. That is why the sensible approach is seasonal rather than permanent.

A workable sequence

1. Before bloom: fit the net frame and have the netting ready, but leave the tree open.
2. During bloom: keep the net open or removed entirely so bees can work the flowers.
3. After petal fall: close the net to protect developing fruit.
4. At harvest: open, pick and then decide whether to re-cover for late-season protection.

This sequence accepts a short period of exposure during flowering and relies on the net for the longer fruit-development phase when protection matters most.

Designing the Enclosure So It Can Be Opened

A pear tree is not a small annual crop, and a net draped directly onto branches is awkward to manage and can damage shoots. A simple frame of posts and horizontal supports, with the net clipped over it, keeps fabric off the foliage and allows sections to be rolled up.

Useful equipment for this task includes:

• Sturdy netting supports such as timber posts or metal hoops sized to the tree's spread.
• Insect netting with a mesh grade appropriate to your main pest, plus a coarser bird net if birds are the primary concern.
• Clips, pegs or weighted hem lines to close gaps at ground level, where pests and birds slip through.
• Access panels or removable roof sections so bloom-time opening is quick rather than a project.

A net that cannot be opened easily tends to stay closed through bloom, which is where pollination problems start. Build for access from the beginning.

Explaining Uncertainty Without Losing Direction

Gardeners often want a firm rule: net pears or do not net pears. The reality depends on your pest pressure, your local bee community, the cultivar pair you grow, the mesh you choose and how well the enclosure is sealed. None of that can be settled by a single universal instruction.

What you can do is reduce the uncertainty to a few decisions you can actually observe:

• Are bees visiting during bloom? Spend a few minutes on a warm, still morning and watch the flowers. If pollinators are working, the open period is doing its job.
• Are you getting fruit set? Compare a branch left open with the rest of the tree if you are unsure.
• What damage appears once the net is closed? Check fruit regularly for entry holes, webbing or sooty deposits.
• Does the mesh match the pest? If codling moth is the target, the mesh must be fine enough to stop it, and that usually means accepting seasonal opening.

This is a practical way to live with uncertainty: set the net up so you can change your mind, then let the tree and the insects tell you what is happening.

Choosing Pear Cultivars With Pollination in Mind

Netting decisions are easier when the orchard is already designed for pollination. Plant at least two compatible pear cultivars that flower at the same time. Many European pears, including well-known dessert types, need a partner; some Asian pears also benefit from cross-pollination. Check the flowering group and compatibility of the specific cultivars you grow rather than assuming any two pears will pair.

A compatible partner, plus a few gaps left for bees during bloom, does more for fruit set than any net ever will. The net protects what pollination has already achieved.

Practical Pear Netting Checklist

• Confirm you have a compatible pollinator cultivar flowering at the same time.
• Choose netting by pest target, not by price alone.
• Build a frame that lets you open the roof or sides quickly.
• Keep the tree open during bloom and close it after petal fall.
• Seal ground-level gaps and inspect regularly.
• Open the net again before harvest and check fruit for ripeness by feel and color.

Pear trees reward a calm, staged approach. Netting is a useful tool for the long fruit-filling months, but it should not be a permanent veil over the flowers. Keep the bloom open, close the net for the season that follows, and judge the result by bee visits and fruit set rather than by a fixed rule.