Blog.Himachal Fruits™

Information about Horticulture & Agriculture just to help growers

Apple Scab Management

Posted on | July 26, 2020 | No Comments

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Apple scab can be successfully managed by integrating #resistant #varieties, cultural practices, and chemical or #biological control.

Variety #selection
Planting resistant or scab-immune apple varieties is the ideal method for managing scab.

Cultural #practices

#Rake and #destroy fallen leaves below apple and crabapple trees in the fall (Figure 4). This will dramatically reduce the number of spores that can start the #disease #cycle (Figure 3) over again the following spring. Leaves can also be chopped with a mulching lawn mower or flail mower but this practice should be coupled with two or three applications of 5 percent #urea to fall #foliage. Urea #applications increase leaf decomposition.

For new #plantings, select a site that gets direct sun for at least eight hours and space trees so that air can move easily through the tree canopies and orchard. Tree spacing will depend on the type of apple tree (dwarf vs. standard) and trellising system. #Prune trees yearly (winter running) also in summer (summer prunning)to open the #canopy and promote leaf drying.

Chemical and biological control

Where resistance to scab is not present, the application of fungicides is the primary method to manage apple scab. #Organic #growers can use bio-control e.g Rot Arrest, Bordo Plus, Huwasan, Nivarr 70% oil, Copper, and light application of sulphur, products to #suppress #disease development but these products should be used in combination with resistant varieties to achieve maximum control. Proper timing of #fungicides is critical for effective control of apple scab. Applications should begin early in the #season when the first green tips begin to emerge and continue on a seven- to 10-day schedule throughout the season. #Early #applications will reduce the number of seasonal sprays needed to manage apple scab and will increase fruit #production and #quality.

Note – Apple scab is economic importance and if not managed, the disease can cause #extensive losses following humid and cool weather conditions during the spring #months. Direct losses result from fruit #infections and indirect losses from #defoliation, which can reduce tree vigor, #winter #hardiness, and #subsequent yield.


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