Managing Root Rot in Apple Orchards: Drainage, Neem, and Mulch

An apple grower in Himachal Pradesh, India, seeks remedies for root rot. The expert response outlines a comprehensive, culturally focused strategy.

Improve Soil Drainage First

Excess moisture is the primary driver of root rot. Key steps:

• Remove all grass and weeds within a 1-meter radius of each trunk.
• Use a pitchfork to aerate the soil every foot in the cleared area—avoid damaging major roots.
• Dig small trenches to redirect standing water away from tree bases.
• Test drainage: fill a 12-inch hole with water; if it doesn't drain in an hour, drainage is inadequate.
• Prevent soil compaction by limiting vehicle traffic in the orchard.

Organic Amendments

Neem cake (the residue after neem oil extraction) acts as both fertilizer and fungicide. Apply 500 grams per 10 square meters as a soil drench. NEEMDEW Neem cake is a locally available product in India with a long history of use against root rot.

Mulch for Protection

Apply organic mulch (straw, leaves, wood chips) over the cleared area. This moderates soil moisture, adds organic matter, and the slight acidity helps suppress some apple pathogens.

Sanitation

Remove and destroy all fallen leaves and fruit to reduce inoculum. There is no cure for established soil-borne fungi, but improving drainage and using neem can dramatically reduce disease pressure.