Koleroga or Mahali is a major disease of arecanut causing serious losses. The pathogen is a fungus Phytophthora palmivora. Spraying the. PDF | On Jan 1, , R Ramesh and others published Management of fruit rot ( Koleroga/ Mahali) disease of arecanut. Koleroga (kole = rotting, roga = disease) as it is called in Karnataka is in the same orchard (as found in Karnataka where arecanut, cocoa, cardamom, black.

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The causative organism was first identified as Phytophthora palmivora by Edwin John Butler in Ramesh Kaintaje, an arecanut grower from Mani, said that as the areas in the foothills of the Western Ghats, afecanut in Sullia and Belthangady taluks, had been receiving rain since mid-April itself, arecanut palms and plantations had moisture content even before the onset of monsoon.

According to the office of the Deputy Commissioner, the district recorded an average rainfall of 4, Bipolaris incurvata Botryosphaeria cocogena Bursaphelenchus cocophilus Cadang-cadang Capnodium footii Cephaleuros virescens Corticium penicillatum Cytospora palmarum Marasmiellus cocophilus Periconiella cocoes Pestalotiopsis palmarum Phaeochoropsis mucosa Phyllosticta palmetto Phytophthora palmivora Pseudoepicoccum cocos Ramularia necator Stigmina palmivora.

The disease leads to heavy shedding of fruits,”explains Dr. Mature zoospores can be induced to germinate by treatment with 0. August 20, One common symptom of P. Prophylactic spraying with one per cent Bordeaux mixture on the bunches is needed to prevent the incidence of the disease. Email will not be published required. Control measures As mechanical control measure, the areca bunches can be covered with polythene covers before the start of the heavy monsoon showers.


This page was last edited on 19 Septemberat A fine spray will be needed for effective spread of spray fluid over the surface of the nuts. In water, however, zoospores are released from germinating sporangia.

Fruit Rot of Betel Nut or Areca Nut Palm

The green colour of the nut-shell turns darker green and the early symptoms gradually spread ultimately covering the entire surface of the nut. Similar diseases of palms are also known to occur in Sri LankaMauritiusand Sumatra.

The antheridia are diclinous and amphigynous. It has also been reported from Assam. Bud rots can also be seen in papaya and coconuts infected with P.

Related Topics Karnataka Mangalore. For PC, position your mouse cursor on the featured image, click the right mouse button, and choose “Save Picture As Sawada [2] Phytophthora faberi Maubl. Each sporangium gives rise to zoospores after a few hours of their formation. From Wikipedia, the free encyclopedia. However, close planting of palms provides ideal conditions for disease spread.

Koleroga Disease of Areca Palms: Symptoms and Management | Plant Pathology

This notice hereby grants permission to APS users to copy the image featured for noncommercial, personal use. Favorable temperature is also a contributing factor to the severity of Phytophthora diseases because of its effect on growth and sporulation of the pathogen.

The leaves and koeroga wither away soon. Careers In Plant Pathology. However, light is not required for sporangia production on infected papaya fruit.

In water, chlamydospores germinate by producing short germ tubes, each with a sporangium at the tip. Trees established with the virgin soil method in the replant fields produce fruit as abundantly as those growing in the first planting fields.


Control of fruit rot or koleroga disease of arecanut (Areca catechu L.) [1988]

Cultural practice is also important in the management of Phytophthora diseases of papaya. This impacts the cost of cacao, and thus the pathogen controls the cost and availability of products such as chocolate. Contact Us – Report a Bad Link.

The first appearance of the koleroga is on the nuts two or three weeks after rains begin. By using this site, you agree to the Terms of Use and Privacy Policy. In the s P. However, chlamydospores produced in papaya juice at lower concentrations or in other kinds of fruit juice are mostly thin-walled. Phyto-sanitary measures such as removal of all dried and infected bunch attached to the palm and collection and destruction of all shed nuts will prove to be rewarding.

Chlamydospores produced in infected papaya fruit and pure papaya juice are thick-walled. Users may want to set up a specific directory and file naming scheme arecabut storing images; otherwise, they aercanut be saved using your system defaults. Bud rots are also found in Palmyra palms and arecantu palms. Retrieved from ” https: