Prévention et Solutions Commerciales

Pear wire mesh rust, caused by Gymnosporangium sabinae , is a fungal disease that seriously affects the health of pear trees. Its complex life cycle, involving juniper as an alternative host, presents a major challenge for orchardists. This article details the symptoms, preventative strategies, and available treatments, while also offering commercial solutions to restore your orchards thanks to Arboriverse, a specialist in fruit plants.


Symptoms of Pear Tree Mesh Rust

Bright orange spots

Infected leaves show bright orange spots 5 to 10 mm in diameter on their upper surface, appearing in spring or summer.

Blackish pustules

Dark pustules develop in the center of the orange spots, a sign of advanced infection.

Warty protuberances

On the underside of the leaves, conical growths appear, containing spores ready to infect the junipers again.


Mushroom Life Cycle

Wintering on junipers

In winter, the fungus survives as mycelium in the twigs of infected junipers, forming orange galls in spring which release spores.

Pear tree infection

The spores, spread by the wind, infect the leaves of pear trees from March to June, causing the first symptoms.

Back to the junipers

In summer, the bumps on the pear leaves release spores that re-infect the junipers, completing the cycle.


Factors Promoting Mesh Rust

  • Climatic conditions: High humidity essential for spore germination, and moderate temperatures between 15 and 25°C.
  • Proximity to junipers: Susceptible junipers, such as Juniperus sabina or J. chinensis , increase the risk of infection.
  • Varietal sensitivity: Certain pear varieties are more vulnerable, amplifying the impact of the disease.

Mesh Rust Prevention

Elimination of alternative hosts

Remove susceptible junipers near pear trees. If removal is not possible, prune infected branches to limit spores.

Choosing resistant varieties

Choose resistant varieties, available from specialist nurseries like Arboriverse.

Orchard maintenance

  • Regular size: Promotes good air circulation.
  • Strict hygiene: Collect and destroy infected leaves.

Biological Treatments

Preventive products

  • Copper-based fungicides: Effective early in the season to prevent infections.
  • Sulfur: Inhibits spore germination.

Natural methods

  • Companion planting: Certain plants repel pathogenic fungi.
  • Natural stimulators: Extracts of horsetail or nettle strengthen the natural defenses of pear trees.

Conventional Treatments

Specific fungicides

  • Myclobutanil: A systemic fungicide effective in curative treatment.
  • Strobilurins and SDHI: Combine preventive and curative action.

Treatment schedule

Apply preventative fungicides as soon as the leaves bud. Repeat applications if conditions are favorable.


Economic Impact of Mesh Rust

Reduced photosynthesis: Orange spots decrease the leaf area available for photosynthesis, limiting fruit production.

Premature defoliation: Severe infections cause leaves to drop prematurely, weakening the tree.

Fruit spoilage: Although fruits are not directly infected, the disease reduces their size and quality.


Arboriverse Business Solutions

At Arboriverse, we understand the impact of diseases like fruit tree rust. As a wholesale supplier of fruit plants, we offer solutions to help growers restore their orchards and prevent future losses.

Why choose Arboriverse?

  • Wide range of plants: Disease-resistant varieties adapted to your region.
  • Professional quality: Our plants come from specialized nurseries.
  • Fast delivery: Directly to your plot, anywhere in France.
  • Competitive prices: Direct sale at producer price.

Our services

  • Free quotes: Evaluate your needs in just 48 hours.
  • Technical advice: Personalized support for your orchard projects.
  • Logistical flexibility: Delivery adapted to your constraints.

Our flagship products

  • Resistant grafted pear tree: Half-stem, high-stem or bare-root, depending on your needs.
  • Specialized rootstocks: Resistant and adapted to different soils.
  • Solutions for diversified orchards: Providing increased resilience to disease.

FAQ

What are the first signs of mesh rust?

Bright orange spots on the leaves appear in spring or summer.

What biological treatments can be used?

Copper and sulfur-based fungicides are very effective in prevention.

Should juniper trees be systematically removed?

Ideally, yes. Otherwise, prune infected branches to reduce the spread.

Does mesh rust directly affect fruit?

No, but it does affect their quality by weakening the tree.

When should treatments start?

As soon as buds break, especially if there are junipers nearby.

How can Arboriverse help arborists?

We provide resilient plants, expert advice and tailored logistics.


Relaunch your Orchards with Arboriverse

Don't let pear rust compromise your harvest. Contact Arboriverse today to discover our resistant pear varieties and strengthen the sustainability of your orchards.