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Black pepper foot rot / quick wilt (Phytophthora capsici) Photo: placeholder pending image-fill pass

Black pepper foot rot / quick wilt (Phytophthora capsici)

Foot rot, also called "quick wilt", is the most devastating disease of black pepper (Piper nigrum) in Kerala and Karnataka, caused mainly by Phytophthora capsici (formerly P. tropicalis / P. palmivora MF4). The disease is monsoon-triggered, can wipe out a vine within 7-10 days of symptom onset, and has been the principal driver of the long-term decline in Indian pepper production tracked by ICAR-Indian Institute of Spices Research, Calicut.

Identification and symptoms

Foliar symptoms appear as dark brown water-soaked lesions on leaves with a characteristic fimbriate (frilled) margin. Infected spikes turn black and shed. The decisive symptom is collar/root rot: brown to black necrosis at the base of the vine, often girdling the stem. Once the collar is girdled the entire vine yellows, defoliates and dies within a week or two — hence "quick wilt".

Hosts and life cycle

Phytophthora capsici survives as oospores and chlamydospores in soil and infected plant debris. Pre-monsoon showers trigger sporangia release; rain splash and surface flow carry zoospores from soil to leaves and from infected plants downslope. Optimum infection is at 22-28 °C with continuous leaf wetness. Piper nigrum, betelvine, areca seedlings and several solanaceous crops are alternate hosts.

Damage and economic impact

Quick wilt has caused estimated 30-40% cumulative reduction in productive vine stand across Idukki, Wayanad and Kodagu since the 1980s. Heavy outbreaks during the southwest monsoon can kill 10-30% of vines in unmanaged gardens in a single season.

Management

ICAR-IISR recommends an integrated package:

  • Plant tolerant releases such as IISR Sakthi (Panniyur 1 × Perambramundi) and [[black-pepper-iisr-thevam-girimunda|IISR Thevam / Girimunda]] in foot-rot-prone gardens.
  • Provide drainage; avoid water stagnation at vine base.
  • Apply Trichoderma harzianum (IISR strain) @ 50 g per vine enriched on neem cake, twice (May, September).
  • Prophylactic spray of Bordeaux mixture 1% before the monsoon, followed by soil drench of copper oxychloride 0.2% or potassium phosphonate 0.3% at collar.
  • Remove and burn infected vines and surface roots; do not replant in the same pit for one season.

See also: Black Pepper Karimunda Traditional, Black Pepper Panniyur 1 To 9, Black Pepper Iisr Thevam Girimunda, Black Pepper Pollu Beetle Longitarsus.

References

  1. Foot rot / quick wilt of black pepper — ICAR-IISR Calicut. https://www.spices.res.in/research/pepper
  2. Phytophthora foot rot management in black pepper. https://www.indianspices.com/sites/default/files/blackpeppercultivation.pdf