2VWLY5M4

2516

10 mars 2021 22:07

10 mars 2021 22:07

Unsprayed organic apple trees growing under a rain roof covering system were assessed over three years for fungal diseases, fruit quality and irradiance conditions and compared to standard organic managed trees growing under hail-netting. The orchard consisted of about 550 trees of cultivar ‘Topaz’ on rootstock M9 divided between the two treatments. The incidence of apple scab on shoots and fungal storage rots (Neofabraea spp) on fruit in the roof covered treatment was lower, compared to the standard managed trees. But there was no influence on other storage rots caused by Penicillium, Botrytis or Monilia. The incidence of sooty blotch was reduced in the covered treatment compared to the uncovered control. Apple russeting was also lower in the covered treatment than in the uncovered control. There was no clear treatment effect regarded frost damage. A positive effect was observed at slightly low temperatures, but at colder temperatures it turned into a negative effect with more damage to the fruit. Over all three experimental years incoming solar radiation was reduced by about one-third under the rain roof covers in comparison to the control trees under hail-netting. Due to the reduced incoming solar radiation, the foil wide treatment was not affected by sunburn on apple fruits whereas the control treatment showed a slight sunburn incident.

None

• AB - Spécifique
• FREDO lutte
• FREDO santé végétale
• GEO Allemagne
• fungicide
• pomme
• protected farming
• rain cover
• storage fungal rots
• verger

7

2018

1 janvier 2018