ஏலக்காய் செடியில் ஏற்படும் இலைக்கருகல் நோயைக் (Leaf Blight) கட்டுப்படுத்தும் வழிமுறைகள்

LEAF BLIGHT

CAUSAL ORGANISM: Colletotrichum gloeosporioides

Leaf blight sometimes referred to as Chenthal, when a complex of Cercospora (in circular shape), Helminthospora (in irregular shape) or Colletotrichum (rectangular shape) arises together. The disease appears during mid-monsoon, becomes severe during late monsoon period.

DAMAGE SYMPTOMS: Appearance of rectangular linear reddish-brown lesions mainly on the lower surface of the leaves, which later to form parallel arranged streaks. In advanced stages, several such lesions develop on young and older leaves, which eventually dry up and gives a burnt appearance to plants

FAVOURABLE CONDITIONS: High rainfall and humidity. Intermittent rain and prevalence of misty conditions

MODE OF SPREAD AND SURVIVAL: The intensity of the disease is severe in open areas where shade is inadequate

MANAGEMENT:

PROPHYLACTIC MEASURES: Remove and destroy the severely infected leaves . Bordeaux mixture (1 %)

CURATIVE MEASURES:

Spray: Any one of the following combination can be used at the recommended dosage in 200 litre water

Zineb – 200 gm + Mailcon super (Hexaconazole 5% SC) - 200 ml
COC – 200 gm + Tebuconazole – 200 ml
Tebuconazole 50% + Trifloxystrobin 25% WG – 100 gm
Thiophanate methyl 25% + Mancozeb 50 % WG – 300 gm
Propiconazole 13.9 % + Difenoconazole 13.9 % EC -150 ml
Dose: 1 - 2 Lt /plant #agri #cardamomo #agriculture